Auto merge of #76004 - richkadel:llvm-coverage-map-gen-6b.5, r=tmandry

Tools, tests, and experimenting with MIR-derived coverage counters

Leverages the new mir_dump output file in HTML+CSS (from #76074) to visualize coverage code regions
and the MIR features that they came from (including overlapping spans).

See example below.

The `run-make-fulldeps/instrument-coverage` test has been refactored to maximize test coverage and reduce code duplication. The new tests support testing with and without `-Clink-dead-code`, so Rust coverage can be tested on MSVC (which, currently, only works with `link-dead-code` _disabled_).

New tests validate coverage region generation and coverage reports with multiple counters per function. Starting with a simple `if-else` branch tests, coverage tests for each additional syntax type can be added by simply dropping in a new Rust sample program.

Includes a basic, MIR-block-based implementation of coverage injection,
available via `-Zexperimental-coverage`. This implementation has known
flaws and omissions, but is simple enough to validate the new tools and
tests.

The existing `-Zinstrument-coverage` option currently enables
function-level coverage only, which at least appears to generate
accurate coverage reports at that level.

Experimental coverage is not accurate at this time. When branch coverage
works as intended, the `-Zexperimental-coverage` option should be
removed.

This PR replaces the bulk of PR #75828, with the remaining parts of
that PR distributed among other separate and indentpent PRs.

This PR depends on two of those other PRs: #76002, #76003 and #76074

Rust compiler MCP rust-lang/compiler-team#278

Relevant issue: #34701 - Implement support for LLVMs code coverage
instrumentation

![Screen-Recording-2020-08-21-at-2](https://user-images.githubusercontent.com/3827298/90972923-ff417880-e4d1-11ea-92bb-8713c6198f6d.gif)

r? @tmandry
FYI: @wesleywiser
This commit is contained in:
bors 2020-09-04 01:31:07 +00:00
commit 4ffb5c5954
28 changed files with 2070 additions and 297 deletions

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@ -1530,7 +1530,24 @@ impl Debug for Statement<'_> {
AscribeUserType(box (ref place, ref c_ty), ref variance) => { AscribeUserType(box (ref place, ref c_ty), ref variance) => {
write!(fmt, "AscribeUserType({:?}, {:?}, {:?})", place, variance, c_ty) write!(fmt, "AscribeUserType({:?}, {:?}, {:?})", place, variance, c_ty)
} }
Coverage(box ref coverage) => write!(fmt, "{:?}", coverage), Coverage(box ref coverage) => {
let rgn = &coverage.code_region;
match coverage.kind {
CoverageKind::Counter { id, .. } => {
write!(fmt, "Coverage::Counter({:?}) for {:?}", id.index(), rgn)
}
CoverageKind::Expression { id, lhs, op, rhs } => write!(
fmt,
"Coverage::Expression({:?}) = {} {} {} for {:?}",
id.index(),
lhs.index(),
if op == coverage::Op::Add { "+" } else { "-" },
rhs.index(),
rgn
),
CoverageKind::Unreachable => write!(fmt, "Coverage::Unreachable for {:?}", rgn),
}
}
Nop => write!(fmt, "nop"), Nop => write!(fmt, "nop"),
} }
} }

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@ -1,23 +1,34 @@
use crate::transform::{MirPass, MirSource}; use crate::transform::{MirPass, MirSource};
use crate::util::pretty;
use crate::util::spanview::{
source_range_no_file, statement_kind_name, terminator_kind_name, write_spanview_document,
SpanViewable, TOOLTIP_INDENT,
};
use rustc_data_structures::fingerprint::Fingerprint; use rustc_data_structures::fingerprint::Fingerprint;
use rustc_data_structures::stable_hasher::{HashStable, StableHasher}; use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
use rustc_index::bit_set::BitSet;
use rustc_middle::hir; use rustc_middle::hir;
use rustc_middle::ich::StableHashingContext; use rustc_middle::ich::StableHashingContext;
use rustc_middle::mir; use rustc_middle::mir;
use rustc_middle::mir::coverage::*; use rustc_middle::mir::coverage::*;
use rustc_middle::mir::visit::Visitor; use rustc_middle::mir::visit::Visitor;
use rustc_middle::mir::{BasicBlock, Coverage, CoverageInfo, Location, Statement, StatementKind}; use rustc_middle::mir::{
BasicBlock, BasicBlockData, Coverage, CoverageInfo, Location, Statement, StatementKind,
TerminatorKind,
};
use rustc_middle::ty::query::Providers; use rustc_middle::ty::query::Providers;
use rustc_middle::ty::TyCtxt; use rustc_middle::ty::TyCtxt;
use rustc_span::def_id::DefId; use rustc_span::def_id::DefId;
use rustc_span::{FileName, Pos, RealFileName, Span, Symbol}; use rustc_span::{FileName, Pos, RealFileName, Span, Symbol};
/// Inserts call to count_code_region() as a placeholder to be replaced during code generation with /// Inserts `StatementKind::Coverage` statements that either instrument the binary with injected
/// the intrinsic llvm.instrprof.increment. /// counters, via intrinsic `llvm.instrprof.increment`, and/or inject metadata used during codegen
/// to construct the coverage map.
pub struct InstrumentCoverage; pub struct InstrumentCoverage;
/// The `query` provider for `CoverageInfo`, requested by `codegen_intrinsic_call()` when /// The `query` provider for `CoverageInfo`, requested by `codegen_coverage()` (to inject each
/// constructing the arguments for `llvm.instrprof.increment`. /// counter) and `FunctionCoverage::new()` (to extract the coverage map metadata from the MIR).
pub(crate) fn provide(providers: &mut Providers) { pub(crate) fn provide(providers: &mut Providers) {
providers.coverageinfo = |tcx, def_id| coverageinfo_from_mir(tcx, def_id); providers.coverageinfo = |tcx, def_id| coverageinfo_from_mir(tcx, def_id);
} }
@ -43,8 +54,8 @@ impl Visitor<'_> for CoverageVisitor {
} }
} }
fn coverageinfo_from_mir<'tcx>(tcx: TyCtxt<'tcx>, mir_def_id: DefId) -> CoverageInfo { fn coverageinfo_from_mir<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId) -> CoverageInfo {
let mir_body = tcx.optimized_mir(mir_def_id); let mir_body = tcx.optimized_mir(def_id);
// The `num_counters` argument to `llvm.instrprof.increment` is the number of injected // The `num_counters` argument to `llvm.instrprof.increment` is the number of injected
// counters, with each counter having a counter ID from `0..num_counters-1`. MIR optimization // counters, with each counter having a counter ID from `0..num_counters-1`. MIR optimization
@ -63,18 +74,30 @@ fn coverageinfo_from_mir<'tcx>(tcx: TyCtxt<'tcx>, mir_def_id: DefId) -> Coverage
} }
impl<'tcx> MirPass<'tcx> for InstrumentCoverage { impl<'tcx> MirPass<'tcx> for InstrumentCoverage {
fn run_pass(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, mir_body: &mut mir::Body<'tcx>) { fn run_pass(
&self,
tcx: TyCtxt<'tcx>,
mir_source: MirSource<'tcx>,
mir_body: &mut mir::Body<'tcx>,
) {
// If the InstrumentCoverage pass is called on promoted MIRs, skip them. // If the InstrumentCoverage pass is called on promoted MIRs, skip them.
// See: https://github.com/rust-lang/rust/pull/73011#discussion_r438317601 // See: https://github.com/rust-lang/rust/pull/73011#discussion_r438317601
if src.promoted.is_none() { if mir_source.promoted.is_none() {
Instrumentor::new(tcx, src, mir_body).inject_counters(); Instrumentor::new(&self.name(), tcx, mir_source, mir_body).inject_counters();
} }
} }
} }
#[derive(Clone)]
struct CoverageRegion {
pub span: Span,
pub blocks: Vec<BasicBlock>,
}
struct Instrumentor<'a, 'tcx> { struct Instrumentor<'a, 'tcx> {
pass_name: &'a str,
tcx: TyCtxt<'tcx>, tcx: TyCtxt<'tcx>,
mir_def_id: DefId, mir_source: MirSource<'tcx>,
mir_body: &'a mut mir::Body<'tcx>, mir_body: &'a mut mir::Body<'tcx>,
hir_body: &'tcx rustc_hir::Body<'tcx>, hir_body: &'tcx rustc_hir::Body<'tcx>,
function_source_hash: Option<u64>, function_source_hash: Option<u64>,
@ -83,12 +106,17 @@ struct Instrumentor<'a, 'tcx> {
} }
impl<'a, 'tcx> Instrumentor<'a, 'tcx> { impl<'a, 'tcx> Instrumentor<'a, 'tcx> {
fn new(tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, mir_body: &'a mut mir::Body<'tcx>) -> Self { fn new(
let mir_def_id = src.def_id(); pass_name: &'a str,
let hir_body = hir_body(tcx, mir_def_id); tcx: TyCtxt<'tcx>,
mir_source: MirSource<'tcx>,
mir_body: &'a mut mir::Body<'tcx>,
) -> Self {
let hir_body = hir_body(tcx, mir_source.def_id());
Self { Self {
pass_name,
tcx, tcx,
mir_def_id, mir_source,
mir_body, mir_body,
hir_body, hir_body,
function_source_hash: None, function_source_hash: None,
@ -127,19 +155,100 @@ impl<'a, 'tcx> Instrumentor<'a, 'tcx> {
} }
fn inject_counters(&mut self) { fn inject_counters(&mut self) {
let tcx = self.tcx;
let def_id = self.mir_source.def_id();
let mir_body = &self.mir_body;
let body_span = self.hir_body.value.span; let body_span = self.hir_body.value.span;
debug!("instrumenting {:?}, span: {:?}", self.mir_def_id, body_span); debug!(
"instrumenting {:?}, span: {}",
def_id,
tcx.sess.source_map().span_to_string(body_span)
);
// FIXME(richkadel): As a first step, counters are only injected at the top of each if !tcx.sess.opts.debugging_opts.experimental_coverage {
// function. The complete solution will inject counters at each conditional code branch. // Coverage at the function level should be accurate. This is the default implementation
let block = rustc_middle::mir::START_BLOCK; // if `-Z experimental-coverage` is *NOT* enabled.
let counter = self.make_counter(); let block = rustc_middle::mir::START_BLOCK;
self.inject_statement(counter, body_span, block); let counter = self.make_counter();
self.inject_statement(counter, body_span, block);
return;
}
// FIXME(richkadel): else if `-Z experimental-coverage` *IS* enabled: Efforts are still in
// progress to identify the correct code region spans and associated counters to generate
// accurate Rust coverage reports.
// FIXME(richkadel): The next step to implement source based coverage analysis will be let block_span = |data: &BasicBlockData<'tcx>| {
// instrumenting branches within functions, and some regions will be counted by "counter // The default span will be the `Terminator` span; but until we have a smarter solution,
// expression". The function to inject counter expression is implemented. Replace this // the coverage region also incorporates at least the statements in this BasicBlock as
// "fake use" with real use. // well. Extend the span to encompass all, if possible.
// FIXME(richkadel): Assuming the terminator's span is already known to be contained in `body_span`.
let mut span = data.terminator().source_info.span;
// FIXME(richkadel): It's looking unlikely that we should compute a span from MIR
// spans, but if we do keep something like this logic, we will need a smarter way
// to combine `Statement`s and/or `Terminator`s with `Span`s from different
// files.
for statement_span in data.statements.iter().map(|statement| statement.source_info.span)
{
// Only combine Spans from the function's body_span.
if body_span.contains(statement_span) {
span = span.to(statement_span);
}
}
span
};
// Traverse the CFG but ignore anything following an `unwind`
let cfg_without_unwind = ShortCircuitPreorder::new(mir_body, |term_kind| {
let mut successors = term_kind.successors();
match &term_kind {
// SwitchInt successors are never unwind, and all of them should be traversed
TerminatorKind::SwitchInt { .. } => successors,
// For all other kinds, return only the first successor, if any, and ignore unwinds
_ => successors.next().into_iter().chain(&[]),
}
});
let mut coverage_regions = Vec::with_capacity(cfg_without_unwind.size_hint().0);
for (bb, data) in cfg_without_unwind {
if !body_span.contains(data.terminator().source_info.span) {
continue;
}
// FIXME(richkadel): Regions will soon contain multiple blocks.
let mut blocks = Vec::new();
blocks.push(bb);
let span = block_span(data);
coverage_regions.push(CoverageRegion { span, blocks });
}
let span_viewables = if pretty::dump_enabled(tcx, self.pass_name, def_id) {
Some(self.span_viewables(&coverage_regions))
} else {
None
};
// Inject counters for the selected spans
for CoverageRegion { span, blocks } in coverage_regions {
debug!(
"Injecting counter at: {:?}:\n{}\n==========",
span,
tcx.sess.source_map().span_to_snippet(span).expect("Error getting source for span"),
);
let counter = self.make_counter();
self.inject_statement(counter, span, blocks[0]);
}
if let Some(span_viewables) = span_viewables {
let mut file =
pretty::create_dump_file(tcx, "html", None, self.pass_name, &0, self.mir_source)
.expect("Unexpected error creating MIR spanview HTML file");
write_spanview_document(tcx, def_id, span_viewables, &mut file)
.expect("Unexpected IO error dumping coverage spans as HTML");
}
// FIXME(richkadel): Some regions will be counted by "counter expression". Counter
// expressions are supported, but are not yet generated. When they are, remove this `fake_use`
// block.
let fake_use = false; let fake_use = false;
if fake_use { if fake_use {
let add = false; let add = false;
@ -193,6 +302,83 @@ impl<'a, 'tcx> Instrumentor<'a, 'tcx> {
}; };
data.statements.push(statement); data.statements.push(statement);
} }
/// Converts the computed `CoverageRegion`s into `SpanViewable`s.
fn span_viewables(&self, coverage_regions: &Vec<CoverageRegion>) -> Vec<SpanViewable> {
let mut span_viewables = Vec::new();
for coverage_region in coverage_regions {
span_viewables.push(SpanViewable {
span: coverage_region.span,
title: format!("{}", coverage_region.blocks[0].index()),
tooltip: self.make_tooltip_text(coverage_region),
});
}
span_viewables
}
/// A custom tooltip renderer used in a spanview HTML+CSS document used for coverage analysis.
fn make_tooltip_text(&self, coverage_region: &CoverageRegion) -> String {
const INCLUDE_COVERAGE_STATEMENTS: bool = false;
let tcx = self.tcx;
let source_map = tcx.sess.source_map();
let mut text = Vec::new();
for (i, &bb) in coverage_region.blocks.iter().enumerate() {
if i > 0 {
text.push("\n".to_owned());
}
text.push(format!("{:?}: {}:", bb, &source_map.span_to_string(coverage_region.span)));
let data = &self.mir_body.basic_blocks()[bb];
for statement in &data.statements {
let statement_string = match statement.kind {
StatementKind::Coverage(box ref coverage) => match coverage.kind {
CoverageKind::Counter { id, .. } => {
if !INCLUDE_COVERAGE_STATEMENTS {
continue;
}
format!("increment counter #{}", id.index())
}
CoverageKind::Expression { id, lhs, op, rhs } => {
if !INCLUDE_COVERAGE_STATEMENTS {
continue;
}
format!(
"expression #{} = {} {} {}",
id.index(),
lhs.index(),
if op == Op::Add { "+" } else { "-" },
rhs.index()
)
}
CoverageKind::Unreachable => {
if !INCLUDE_COVERAGE_STATEMENTS {
continue;
}
format!("unreachable")
}
},
_ => format!("{:?}", statement),
};
let source_range = source_range_no_file(tcx, &statement.source_info.span);
text.push(format!(
"\n{}{}: {}: {}",
TOOLTIP_INDENT,
source_range,
statement_kind_name(statement),
statement_string
));
}
let term = data.terminator();
let source_range = source_range_no_file(tcx, &term.source_info.span);
text.push(format!(
"\n{}{}: {}: {:?}",
TOOLTIP_INDENT,
source_range,
terminator_kind_name(term),
term.kind
));
}
text.join("")
}
} }
/// Convert the Span into its file name, start line and column, and end line and column /// Convert the Span into its file name, start line and column, and end line and column
@ -227,7 +413,7 @@ fn make_code_region<'tcx>(tcx: TyCtxt<'tcx>, span: &Span) -> CodeRegion {
} }
fn hir_body<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId) -> &'tcx rustc_hir::Body<'tcx> { fn hir_body<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId) -> &'tcx rustc_hir::Body<'tcx> {
let hir_node = tcx.hir().get_if_local(def_id).expect("DefId is local"); let hir_node = tcx.hir().get_if_local(def_id).expect("expected DefId is local");
let fn_body_id = hir::map::associated_body(hir_node).expect("HIR node is a function with body"); let fn_body_id = hir::map::associated_body(hir_node).expect("HIR node is a function with body");
tcx.hir().body(fn_body_id) tcx.hir().body(fn_body_id)
} }
@ -245,3 +431,61 @@ fn hash(
node.hash_stable(hcx, &mut stable_hasher); node.hash_stable(hcx, &mut stable_hasher);
stable_hasher.finish() stable_hasher.finish()
} }
pub struct ShortCircuitPreorder<
'a,
'tcx,
F: Fn(&'tcx TerminatorKind<'tcx>) -> mir::Successors<'tcx>,
> {
body: &'a mir::Body<'tcx>,
visited: BitSet<BasicBlock>,
worklist: Vec<BasicBlock>,
filtered_successors: F,
}
impl<'a, 'tcx, F: Fn(&'tcx TerminatorKind<'tcx>) -> mir::Successors<'tcx>>
ShortCircuitPreorder<'a, 'tcx, F>
{
pub fn new(
body: &'a mir::Body<'tcx>,
filtered_successors: F,
) -> ShortCircuitPreorder<'a, 'tcx, F> {
let worklist = vec![mir::START_BLOCK];
ShortCircuitPreorder {
body,
visited: BitSet::new_empty(body.basic_blocks().len()),
worklist,
filtered_successors,
}
}
}
impl<'a: 'tcx, 'tcx, F: Fn(&'tcx TerminatorKind<'tcx>) -> mir::Successors<'tcx>> Iterator
for ShortCircuitPreorder<'a, 'tcx, F>
{
type Item = (BasicBlock, &'a BasicBlockData<'tcx>);
fn next(&mut self) -> Option<(BasicBlock, &'a BasicBlockData<'tcx>)> {
while let Some(idx) = self.worklist.pop() {
if !self.visited.insert(idx) {
continue;
}
let data = &self.body[idx];
if let Some(ref term) = data.terminator {
self.worklist.extend((self.filtered_successors)(&term.kind));
}
return Some((idx, data));
}
None
}
fn size_hint(&self) -> (usize, Option<usize>) {
let size = self.body.basic_blocks().len() - self.visited.count();
(size, Some(size))
}
}

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@ -1742,6 +1742,10 @@ pub fn build_session_options(matches: &getopts::Matches) -> Options {
); );
} }
if debugging_opts.experimental_coverage {
debugging_opts.instrument_coverage = true;
}
if debugging_opts.instrument_coverage { if debugging_opts.instrument_coverage {
if cg.profile_generate.enabled() || cg.profile_use.is_some() { if cg.profile_generate.enabled() || cg.profile_use.is_some() {
early_error( early_error(

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@ -893,6 +893,11 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
all statements)."), all statements)."),
emit_stack_sizes: bool = (false, parse_bool, [UNTRACKED], emit_stack_sizes: bool = (false, parse_bool, [UNTRACKED],
"emit a section containing stack size metadata (default: no)"), "emit a section containing stack size metadata (default: no)"),
experimental_coverage: bool = (false, parse_bool, [TRACKED],
"enable and extend the `-Z instrument-coverage` function-level coverage \
feature, adding additional experimental (likely inaccurate) counters and \
code regions (used by `rustc` compiler developers to test new coverage \
counter placements) (default: no)"),
fewer_names: bool = (false, parse_bool, [TRACKED], fewer_names: bool = (false, parse_bool, [TRACKED],
"reduce memory use by retaining fewer names within compilation artifacts (LLVM-IR) \ "reduce memory use by retaining fewer names within compilation artifacts (LLVM-IR) \
(default: no)"), (default: no)"),

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@ -6,7 +6,7 @@
bb0: { bb0: {
_0 = const true; // scope 0 at /the/src/instrument_coverage.rs:20:5: 20:9 _0 = const true; // scope 0 at /the/src/instrument_coverage.rs:20:5: 20:9
+ Coverage { kind: Counter { function_source_hash: 10208505205182607101, id: CounterValueReference(0) }, code_region: /the/src/instrument_coverage.rs:19:18 - 21:2 }; // scope 0 at /the/src/instrument_coverage.rs:21:2: 21:2 + Coverage::Counter(0) for /the/src/instrument_coverage.rs:19:18 - 21:2; // scope 0 at /the/src/instrument_coverage.rs:21:2: 21:2
return; // scope 0 at /the/src/instrument_coverage.rs:21:2: 21:2 return; // scope 0 at /the/src/instrument_coverage.rs:21:2: 21:2
} }
} }

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@ -8,7 +8,7 @@
let mut _3: !; // in scope 0 at /the/src/instrument_coverage.rs:12:18: 14:10 let mut _3: !; // in scope 0 at /the/src/instrument_coverage.rs:12:18: 14:10
bb0: { bb0: {
+ Coverage { kind: Counter { function_source_hash: 16004455475339839479, id: CounterValueReference(0) }, code_region: /the/src/instrument_coverage.rs:10:11 - 16:2 }; // scope 0 at /the/src/instrument_coverage.rs:11:5: 15:6 + Coverage::Counter(0) for /the/src/instrument_coverage.rs:10:11 - 16:2; // scope 0 at /the/src/instrument_coverage.rs:11:5: 15:6
falseUnwind -> [real: bb1, cleanup: bb2]; // scope 0 at /the/src/instrument_coverage.rs:11:5: 15:6 falseUnwind -> [real: bb1, cleanup: bb2]; // scope 0 at /the/src/instrument_coverage.rs:11:5: 15:6
} }

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@ -0,0 +1,77 @@
# needs-profiler-support
# ISSUE(76038): When targeting MSVC, Rust binaries built with both `-Z instrument-coverage` and
# `-C link-dead-code` typically crash (with a seg-fault) or at best generate an empty `*.profraw`.
# See ../instrument-coverage/coverage_tools.mk for more information.
-include ../instrument-coverage/coverage_tools.mk
BASEDIR=../instrument-coverage-cov-reports-base
SOURCEDIR=../instrument-coverage
all: $(patsubst $(SOURCEDIR)/%.rs,%,$(wildcard $(SOURCEDIR)/*.rs))
# Ensure there are no `expected` results for tests that may have been removed or renamed
.PHONY: clear_expected_if_blessed
clear_expected_if_blessed:
ifdef RUSTC_BLESS_TEST
rm -f expected_export_coverage.*.json
rm -f typical_show_coverage.*.txt
endif
-include clear_expected_if_blessed
%: $(SOURCEDIR)/%.rs
# Compile the test program with "experimental" coverage instrumentation and generate relevant MIR.
#
# FIXME(richkadel): `-Zexperimental-coverage` to `-Zinstrument-coverage` once we are
# satisfied with the branch-level instrumentation.
$(RUSTC) $(SOURCEDIR)/$@.rs \
-Zexperimental-coverage \
-Clink-dead-code=$(LINK_DEAD_CODE)
# Run it in order to generate some profiling data,
# with `LLVM_PROFILE_FILE=<profdata_file>` environment variable set to
# output the coverage stats for this run.
LLVM_PROFILE_FILE="$(TMPDIR)"/$@.profraw \
$(call RUN,$@)
# Postprocess the profiling data so it can be used by the llvm-cov tool
"$(LLVM_BIN_DIR)"/llvm-profdata merge --sparse \
"$(TMPDIR)"/$@.profraw \
-o "$(TMPDIR)"/$@.profdata
# Generate a coverage report using `llvm-cov show`. The output ordering
# can be non-deterministic, so ignore the return status. If the test fails
# when comparing the JSON `export`, the `show` output may be useful when
# debugging.
"$(LLVM_BIN_DIR)"/llvm-cov show \
--Xdemangler="$(RUST_DEMANGLER)" \
--show-line-counts-or-regions \
--instr-profile="$(TMPDIR)"/$@.profdata \
$(call BIN,"$(TMPDIR)"/$@) \
> "$(TMPDIR)"/actual_show_coverage.$@.txt
ifdef RUSTC_BLESS_TEST
cp "$(TMPDIR)"/actual_show_coverage.$@.txt typical_show_coverage.$@.txt
else
# Compare the show coverage output (`--bless` refreshes `typical` files)
$(DIFF) typical_show_coverage.$@.txt "$(TMPDIR)"/actual_show_coverage.$@.txt || \
>&2 echo 'diff failed for `llvm-cov show` on $@ (might not be an error)'
endif
# Generate a coverage report in JSON, using `llvm-cov export`, and fail if
# there are differences from the expected output.
"$(LLVM_BIN_DIR)"/llvm-cov export \
--summary-only \
--instr-profile="$(TMPDIR)"/$@.profdata \
$(call BIN,"$(TMPDIR)"/$@) \
| "$(PYTHON)" $(BASEDIR)/prettify_json.py \
> "$(TMPDIR)"/actual_export_coverage.$@.json
ifdef RUSTC_BLESS_TEST
cp "$(TMPDIR)"/actual_export_coverage.$@.json expected_export_coverage.$@.json
else
# Check that exported JSON coverage data matches what we expect (`--bless` refreshes `expected`)
$(DIFF) expected_export_coverage.$@.json "$(TMPDIR)"/actual_export_coverage.$@.json
endif

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@ -0,0 +1,59 @@
{
"data": [
{
"files": [
{
"filename": "../instrument-coverage/coverage_of_if_else.rs",
"summary": {
"functions": {
"count": 1,
"covered": 1,
"percent": 100
},
"instantiations": {
"count": 1,
"covered": 1,
"percent": 100
},
"lines": {
"count": 46,
"covered": 19,
"percent": 41.30434782608695
},
"regions": {
"count": 75,
"covered": 23,
"notcovered": 52,
"percent": 30.666666666666664
}
}
}
],
"totals": {
"functions": {
"count": 1,
"covered": 1,
"percent": 100
},
"instantiations": {
"count": 1,
"covered": 1,
"percent": 100
},
"lines": {
"count": 46,
"covered": 19,
"percent": 41.30434782608695
},
"regions": {
"count": 75,
"covered": 23,
"notcovered": 52,
"percent": 30.666666666666664
}
}
}
],
"type": "llvm.coverage.json.export",
"version": "2.0.1"
}

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@ -0,0 +1,64 @@
1| |#![allow(unused_assignments)]
2| |
3| |fn main() {
4| | let mut countdown = 0;
5| 2| if true {
^1
6| 2| countdown = 10;
7| 2| }
8| |
9| 2| if countdown > 7 {
^1
10| 2| countdown -= 4;
^1
11| 2| } else if countdown > 2 {
^0 ^0
12| 0| if countdown < 1 || countdown > 5 || countdown != 9 {
13| 0| countdown = 0;
14| 0| }
15| 0| countdown -= 5;
16| 0| } else {
17| 0| return;
18| 0| }
19| 0|
20| 0| let mut countdown = 0;
21| 2| if true {
^1
22| 2| countdown = 10;
23| 2| }
24| 0|
25| 2| if countdown > 7 {
^1
26| 2| countdown -= 4;
^1
27| 2| } else if countdown > 2 {
^0 ^0
28| 0| if countdown < 1 || countdown > 5 || countdown != 9 {
29| 0| countdown = 0;
30| 0| }
31| 0| countdown -= 5;
32| 0| } else {
33| 0| return;
34| 0| }
35| 0|
36| 0| let mut countdown = 0;
37| 2| if true {
^1
38| 2| countdown = 10;
39| 2| }
40| 0|
41| 2| if countdown > 7 {
^1
42| 2| countdown -= 4;
^1
43| 2| } else if countdown > 2 {
^0 ^0
44| 0| if countdown < 1 || countdown > 5 || countdown != 9 {
45| 0| countdown = 0;
46| 0| }
47| 0| countdown -= 5;
48| 0| } else {
49| 0| return;
50| 0| }
51| 1|}

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@ -0,0 +1,11 @@
# needs-profiler-support
# ignore-msvc
# LINK_DEAD_CODE requires ignore-msvc due to Issue #76038
LINK_DEAD_CODE=yes
-include ../instrument-coverage-cov-reports-base/Makefile
# ISSUE(76038): When targeting MSVC, Rust binaries built with both `-Z instrument-coverage` and
# `-C link-dead-code` typically crash (with a seg-fault) or at best generate an empty `*.profraw`.
# See ../instrument-coverage/coverage_tools.mk for more information.

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@ -0,0 +1,59 @@
{
"data": [
{
"files": [
{
"filename": "../instrument-coverage/coverage_of_if_else.rs",
"summary": {
"functions": {
"count": 1,
"covered": 1,
"percent": 100
},
"instantiations": {
"count": 1,
"covered": 1,
"percent": 100
},
"lines": {
"count": 46,
"covered": 19,
"percent": 41.30434782608695
},
"regions": {
"count": 75,
"covered": 23,
"notcovered": 52,
"percent": 30.666666666666664
}
}
}
],
"totals": {
"functions": {
"count": 1,
"covered": 1,
"percent": 100
},
"instantiations": {
"count": 1,
"covered": 1,
"percent": 100
},
"lines": {
"count": 46,
"covered": 19,
"percent": 41.30434782608695
},
"regions": {
"count": 75,
"covered": 23,
"notcovered": 52,
"percent": 30.666666666666664
}
}
}
],
"type": "llvm.coverage.json.export",
"version": "2.0.1"
}

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@ -0,0 +1,64 @@
1| |#![allow(unused_assignments)]
2| |
3| |fn main() {
4| | let mut countdown = 0;
5| 2| if true {
^1
6| 2| countdown = 10;
7| 2| }
8| |
9| 2| if countdown > 7 {
^1
10| 2| countdown -= 4;
^1
11| 2| } else if countdown > 2 {
^0 ^0
12| 0| if countdown < 1 || countdown > 5 || countdown != 9 {
13| 0| countdown = 0;
14| 0| }
15| 0| countdown -= 5;
16| 0| } else {
17| 0| return;
18| 0| }
19| 0|
20| 0| let mut countdown = 0;
21| 2| if true {
^1
22| 2| countdown = 10;
23| 2| }
24| 0|
25| 2| if countdown > 7 {
^1
26| 2| countdown -= 4;
^1
27| 2| } else if countdown > 2 {
^0 ^0
28| 0| if countdown < 1 || countdown > 5 || countdown != 9 {
29| 0| countdown = 0;
30| 0| }
31| 0| countdown -= 5;
32| 0| } else {
33| 0| return;
34| 0| }
35| 0|
36| 0| let mut countdown = 0;
37| 2| if true {
^1
38| 2| countdown = 10;
39| 2| }
40| 0|
41| 2| if countdown > 7 {
^1
42| 2| countdown -= 4;
^1
43| 2| } else if countdown > 2 {
^0 ^0
44| 0| if countdown < 1 || countdown > 5 || countdown != 9 {
45| 0| countdown = 0;
46| 0| }
47| 0| countdown -= 5;
48| 0| } else {
49| 0| return;
50| 0| }
51| 1|}

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@ -0,0 +1,65 @@
# needs-profiler-support
# ISSUE(76038): When targeting MSVC, Rust binaries built with both `-Z instrument-coverage` and
# `-C link-dead-code` typically crash (with a seg-fault) or at best generate an empty `*.profraw`.
# See ../instrument-coverage/coverage_tools.mk for more information.
-include ../instrument-coverage/coverage_tools.mk
BASEDIR=../instrument-coverage-llvm-ir-base
ifeq ($(UNAME),Darwin)
INSTR_PROF_DATA_SUFFIX=,regular,live_support
DATA_SECTION_PREFIX=__DATA,
LLVM_COV_SECTION_PREFIX=__LLVM_COV,
else
INSTR_PROF_DATA_SUFFIX=
DATA_SECTION_PREFIX=
LLVM_COV_SECTION_PREFIX=
endif
ifeq ($(LINK_DEAD_CODE),yes)
DEFINE_INTERNAL=define hidden
else
DEFINE_INTERNAL=define internal
endif
ifdef IS_WINDOWS
LLVM_FILECHECK_OPTIONS=\
-check-prefixes=CHECK,WINDOWS \
-DPRIVATE_GLOBAL='internal global' \
-DDEFINE_INTERNAL='$(DEFINE_INTERNAL)' \
-DINSTR_PROF_DATA='.lprfd$$M' \
-DINSTR_PROF_NAME='.lprfn$$M' \
-DINSTR_PROF_CNTS='.lprfc$$M' \
-DINSTR_PROF_VALS='.lprfv$$M' \
-DINSTR_PROF_VNODES='.lprfnd$$M' \
-DINSTR_PROF_COVMAP='.lcovmap$$M' \
-DINSTR_PROF_ORDERFILE='.lorderfile$$M'
else
LLVM_FILECHECK_OPTIONS=\
-check-prefixes=CHECK \
-DPRIVATE_GLOBAL='private global' \
-DDEFINE_INTERNAL='$(DEFINE_INTERNAL)' \
-DINSTR_PROF_DATA='$(DATA_SECTION_PREFIX)__llvm_prf_data$(INSTR_PROF_DATA_SUFFIX)' \
-DINSTR_PROF_NAME='$(DATA_SECTION_PREFIX)__llvm_prf_names' \
-DINSTR_PROF_CNTS='$(DATA_SECTION_PREFIX)__llvm_prf_cnts' \
-DINSTR_PROF_VALS='$(DATA_SECTION_PREFIX)__llvm_prf_vals' \
-DINSTR_PROF_VNODES='$(DATA_SECTION_PREFIX)__llvm_prf_vnds' \
-DINSTR_PROF_COVMAP='$(LLVM_COV_SECTION_PREFIX)__llvm_covmap' \
-DINSTR_PROF_ORDERFILE='$(DATA_SECTION_PREFIX)__llvm_orderfile'
endif
all:
# Compile the test program with non-experimental coverage instrumentation, and generate LLVM IR
#
# Note: `-Clink-dead-code=no` disables the option, needed because the option is automatically
# enabled for some platforms, but not for Windows MSVC (due to Issue #76038). The state of this
# option affects the generated MIR and coverage, so it is enabled for tests to ensure the
# tests results are the same across platforms.
$(RUSTC) $(BASEDIR)/testprog.rs \
-Zinstrument-coverage \
-Clink-dead-code=$(LINK_DEAD_CODE) \
--emit=llvm-ir
cat "$(TMPDIR)"/testprog.ll | "$(LLVM_FILECHECK)" $(BASEDIR)/filecheck.testprog.txt $(LLVM_FILECHECK_OPTIONS)

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@ -0,0 +1,49 @@
# Check for metadata, variables, declarations, and function definitions injected
# into LLVM IR when compiling with -Zinstrument-coverage.
WINDOWS: $__llvm_profile_runtime_user = comdat any
CHECK: @__llvm_coverage_mapping = internal constant
CHECK-SAME: section "[[INSTR_PROF_COVMAP]]", align 8
WINDOWS: @__llvm_profile_runtime = external global i32
CHECK: @__profc__R{{[a-zA-Z0-9_]+}}testprog14will_be_called = [[PRIVATE_GLOBAL]]
CHECK-SAME: section "[[INSTR_PROF_CNTS]]", align 8
CHECK: @__profd__R{{[a-zA-Z0-9_]+}}testprog14will_be_called = [[PRIVATE_GLOBAL]]
CHECK-SAME: @__profc__R{{[a-zA-Z0-9_]+}}testprog14will_be_called,
CHECK-SAME: section "[[INSTR_PROF_DATA]]", align 8
CHECK: @__profc__R{{[a-zA-Z0-9_]+}}testprog4main = [[PRIVATE_GLOBAL]]
CHECK-SAME: section "[[INSTR_PROF_CNTS]]", align 8
CHECK: @__profd__R{{[a-zA-Z0-9_]+}}testprog4main = [[PRIVATE_GLOBAL]]
CHECK-SAME: @__profc__R{{[a-zA-Z0-9_]+}}testprog4main,
CHECK-SAME: section "[[INSTR_PROF_DATA]]", align 8
CHECK: @__llvm_prf_nm = private constant
CHECK-SAME: section "[[INSTR_PROF_NAME]]", align 1
CHECK: @llvm.used = appending global
CHECK-SAME: i8* bitcast ({ {{.*}} }* @__llvm_coverage_mapping to i8*)
WINDOWS-SAME: i8* bitcast (i32 ()* @__llvm_profile_runtime_user to i8*)
CHECK-SAME: i8* bitcast ({ {{.*}} }* @__profd__R{{[a-zA-Z0-9_]*}}testprog4main to i8*)
CHECK-SAME: i8* getelementptr inbounds ({{.*}}* @__llvm_prf_nm, i32 0, i32 0)
CHECK-SAME: section "llvm.metadata"
CHECK: [[DEFINE_INTERNAL]] { {{.*}} } @_R{{[a-zA-Z0-9_]+}}testprog14will_be_called() unnamed_addr #{{[0-9]+}} {
CHECK-NEXT: start:
CHECK-NOT: bb{{[0-9]+}}:
CHECK: %pgocount = load i64, i64* getelementptr inbounds
CHECK-SAME: * @__profc__R{{[a-zA-Z0-9_]+}}testprog14will_be_called,
CHECK: declare void @llvm.instrprof.increment(i8*, i64, i32, i32) #[[LLVM_INSTRPROF_INCREMENT_ATTR:[0-9]+]]
WINDOWS: define linkonce_odr hidden i32 @__llvm_profile_runtime_user() #[[LLVM_PROFILE_RUNTIME_USER_ATTR:[0-9]+]] comdat {
WINDOWS-NEXT: %1 = load i32, i32* @__llvm_profile_runtime
WINDOWS-NEXT: ret i32 %1
WINDOWS-NEXT: }
CHECK: attributes #[[LLVM_INSTRPROF_INCREMENT_ATTR]] = { nounwind }
WINDOWS: attributes #[[LLVM_PROFILE_RUNTIME_USER_ATTR]] = { noinline }

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@ -0,0 +1,11 @@
# needs-profiler-support
# ignore-msvc
# LINK_DEAD_CODE requires ignore-msvc due to Issue #76038
LINK_DEAD_CODE=yes
-include ../instrument-coverage-llvm-ir-base/Makefile
# ISSUE(76038): When targeting MSVC, Rust binaries built with both `-Z instrument-coverage` and
# `-C link-dead-code` typically crash (with a seg-fault) or at best generate an empty `*.profraw`.
# See ../instrument-coverage/coverage_tools.mk for more information.

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@ -0,0 +1,42 @@
# needs-profiler-support
# ISSUE(76038): When targeting MSVC, Rust binaries built with both `-Z instrument-coverage` and
# `-C link-dead-code` typically crash (with a seg-fault) or at best generate an empty `*.profraw`.
# See ../instrument-coverage/coverage_tools.mk for more information.
-include ../instrument-coverage/coverage_tools.mk
SOURCEDIR=../instrument-coverage
all: $(patsubst $(SOURCEDIR)/%.rs,%,$(wildcard $(SOURCEDIR)/*.rs))
# Ensure there are no `expected` results for tests that may have been removed or renamed
.PHONY: clear_expected_if_blessed
clear_expected_if_blessed:
ifdef RUSTC_BLESS_TEST
rm -rf expected_mir_dump.*/
endif
-include clear_expected_if_blessed
%: $(SOURCEDIR)/%.rs
# Compile the test program with "experimental" coverage instrumentation and generate relevant MIR.
#
# FIXME(richkadel): `-Zexperimental-coverage` to `-Zinstrument-coverage` once we are
# satisfied with the branch-level instrumentation.
$(RUSTC) $(SOURCEDIR)/$@.rs \
-Zexperimental-coverage \
-Clink-dead-code=$(LINK_DEAD_CODE) \
-Zdump-mir=InstrumentCoverage \
-Zdump-mir-dir="$(TMPDIR)"/mir_dump.$@
ifdef RUSTC_BLESS_TEST
mkdir -p expected_mir_dump.$@
cp "$(TMPDIR)"/mir_dump.$@/*InstrumentCoverage.0.html expected_mir_dump.$@/
else
# Check that the selected `mir_dump` files match what we expect (`--bless` refreshes `expected`)
mkdir -p "$(TMPDIR)"/actual_mir_dump.$@
rm -f "$(TMPDIR)"/actual_mir_dump.$@/*
cp "$(TMPDIR)"/mir_dump.$@/*InstrumentCoverage.0.html "$(TMPDIR)"/actual_mir_dump.$@/
$(DIFF) -r expected_mir_dump.$@/ "$(TMPDIR)"/actual_mir_dump.$@/
endif

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@ -0,0 +1,583 @@
<!DOCTYPE html>
<html>
<head>
<title>coverage_of_if_else - Code Regions</title>
<style>
.line {
counter-increment: line;
}
.line:before {
content: counter(line) ": ";
font-family: Menlo, Monaco, monospace;
font-style: italic;
width: 3.8em;
display: inline-block;
text-align: right;
filter: opacity(50%);
-webkit-user-select: none;
}
.code {
color: #dddddd;
background-color: #222222;
font-family: Menlo, Monaco, monospace;
line-height: 1.4em;
border-bottom: 2px solid #222222;
white-space: pre;
display: inline-block;
}
.odd {
background-color: #55bbff;
color: #223311;
}
.even {
background-color: #ee7756;
color: #551133;
}
.code {
--index: calc(var(--layer) - 1);
padding-top: calc(var(--index) * 0.15em);
filter:
hue-rotate(calc(var(--index) * 25deg))
saturate(calc(100% - (var(--index) * 2%)))
brightness(calc(100% - (var(--index) * 1.5%)));
}
.annotation {
color: #4444ff;
font-family: monospace;
font-style: italic;
display: none;
-webkit-user-select: none;
}
body:active .annotation {
/* requires holding mouse down anywhere on the page */
display: inline-block;
}
span:hover .annotation {
/* requires hover over a span ONLY on its first line */
display: inline-block;
}
</style>
</head>
<body>
<div class="code" style="counter-reset: line 2"><span class="line"><span class="code" style="--layer: 0">fn main() {</span></span>
<span class="line"><span class="code" style="--layer: 0"> let mut countdown = 0;</span></span>
<span class="line"><span class="code" style="--layer: 0"> </span><span><span class="code even" style="--layer: 1" title="bb2: ../instrument-coverage/coverage_of_if_else.rs:5:5: 7:6:
5:5-7:6: FalseEdge: falseEdge -&gt; [real: bb4, imaginary: bb3]"><span class="annotation">@2</span></span></span><span class="code even" style="--layer: 2" title="bb4: ../instrument-coverage/coverage_of_if_else.rs:5:5: 7:6:
6:9-6:23: Assign: _1 = const 10_i32
5:13-7:6: Assign: _2 = const ()
5:5-7:6: Goto: goto -&gt; bb5"><span class="annotation">@4</span></span><span class="code even" style="--layer: 3" title="bb3: ../instrument-coverage/coverage_of_if_else.rs:5:5: 7:6:
5:5-7:6: Assign: _2 = const ()
5:5-7:6: Goto: goto -&gt; bb5"><span class="annotation">@3:</span> if </span><span class="code even" style="--layer: 4" title="bb0: ../instrument-coverage/coverage_of_if_else.rs:5:8: 5:12:
4:9-4:22: StorageLive: StorageLive(_1)
4:25-4:26: Assign: _1 = const 0_i32
4:9-4:22: FakeRead: FakeRead(ForLet, _1)
5:5-7:6: StorageLive: StorageLive(_2)
5:8-5:12: StorageLive: StorageLive(_3)
5:8-5:12: Assign: _3 = const true
5:8-5:12: FakeRead: FakeRead(ForMatchedPlace, _3)
5:5-7:6: SwitchInt: switchInt(_3) -&gt; [false: bb3, otherwise: bb2]"><span class="annotation">@0:</span> true</span><span class="code even" style="--layer: 3" title="bb3: ../instrument-coverage/coverage_of_if_else.rs:5:5: 7:6:
5:5-7:6: Assign: _2 = const ()
5:5-7:6: Goto: goto -&gt; bb5"><span class="annotation">@3:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 3" title="bb3: ../instrument-coverage/coverage_of_if_else.rs:5:5: 7:6:
5:5-7:6: Assign: _2 = const ()
5:5-7:6: Goto: goto -&gt; bb5"> countdown = 10;</span></span>
<span class="line"><span class="code even" style="--layer: 3" title="bb3: ../instrument-coverage/coverage_of_if_else.rs:5:5: 7:6:
5:5-7:6: Assign: _2 = const ()
5:5-7:6: Goto: goto -&gt; bb5"> }</span><span class="code" style="--layer: 0"></span></span>
<span class="line"><span class="code" style="--layer: 0"></span></span>
<span class="line"><span class="code" style="--layer: 0"> </span><span><span class="code even" style="--layer: 1" title="bb6: ../instrument-coverage/coverage_of_if_else.rs:9:5: 18:6:
9:5-18:6: FalseEdge: falseEdge -&gt; [real: bb8, imaginary: bb7]"><span class="annotation">@6</span></span></span><span class="code even" style="--layer: 2" title="bb9: ../instrument-coverage/coverage_of_if_else.rs:9:5: 18:6:
10:9-10:23: Assign: _1 = move (_7.0: i32)
9:22-11:6: Assign: _4 = const ()
9:5-18:6: Goto: goto -&gt; bb28"><span class="annotation">@9</span></span><span class="code even" style="--layer: 3" title="bb25: ../instrument-coverage/coverage_of_if_else.rs:9:5: 18:6:
15:9-15:23: Assign: _1 = move (_19.0: i32)
11:29-16:6: Assign: _4 = const ()
18:5-18:6: StorageDead: StorageDead(_8)
9:5-18:6: Goto: goto -&gt; bb28"><span class="annotation">@25:</span> if </span><span class="code even" style="--layer: 4" title="bb5: ../instrument-coverage/coverage_of_if_else.rs:9:8: 9:21:
7:5-7:6: StorageDead: StorageDead(_3)
7:5-7:6: StorageDead: StorageDead(_2)
9:5-18:6: StorageLive: StorageLive(_4)
9:8-9:21: StorageLive: StorageLive(_5)
9:8-9:17: StorageLive: StorageLive(_6)
9:8-9:17: Assign: _6 = _1
9:8-9:21: Assign: _5 = Gt(move _6, const 7_i32)
9:20-9:21: StorageDead: StorageDead(_6)
9:8-9:21: FakeRead: FakeRead(ForMatchedPlace, _5)
9:5-18:6: SwitchInt: switchInt(_5) -&gt; [false: bb7, otherwise: bb6]"><span class="annotation">@5:</span> countdown &gt; 7</span><span class="code even" style="--layer: 3" title="bb25: ../instrument-coverage/coverage_of_if_else.rs:9:5: 18:6:
15:9-15:23: Assign: _1 = move (_19.0: i32)
11:29-16:6: Assign: _4 = const ()
18:5-18:6: StorageDead: StorageDead(_8)
9:5-18:6: Goto: goto -&gt; bb28"><span class="annotation">@25:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 3" title="bb25: ../instrument-coverage/coverage_of_if_else.rs:9:5: 18:6:
15:9-15:23: Assign: _1 = move (_19.0: i32)
11:29-16:6: Assign: _4 = const ()
18:5-18:6: StorageDead: StorageDead(_8)
9:5-18:6: Goto: goto -&gt; bb28"> </span><span class="code odd" style="--layer: 4" title="bb8: ../instrument-coverage/coverage_of_if_else.rs:10:9: 10:23:
10:9-10:23: Assign: _7 = CheckedSub(_1, const 4_i32)
10:9-10:23: Assert: assert(!move (_7.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _1, const 4_i32) -&gt; [success: bb9, unwind: bb1]"><span class="annotation">@8:</span> countdown -= 4</span><span class="code even" style="--layer: 3" title="bb25: ../instrument-coverage/coverage_of_if_else.rs:9:5: 18:6:
15:9-15:23: Assign: _1 = move (_19.0: i32)
11:29-16:6: Assign: _4 = const ()
18:5-18:6: StorageDead: StorageDead(_8)
9:5-18:6: Goto: goto -&gt; bb28"><span class="annotation">@25:</span> ;</span></span>
<span class="line"><span class="code even" style="--layer: 3" title="bb25: ../instrument-coverage/coverage_of_if_else.rs:9:5: 18:6:
15:9-15:23: Assign: _1 = move (_19.0: i32)
11:29-16:6: Assign: _4 = const ()
18:5-18:6: StorageDead: StorageDead(_8)
9:5-18:6: Goto: goto -&gt; bb28"> } else </span><span class="code even" style="--layer: 4" title="bb10: ../instrument-coverage/coverage_of_if_else.rs:11:12: 18:6:
11:12-18:6: FalseEdge: falseEdge -&gt; [real: bb12, imaginary: bb11]"><span class="annotation">@10:</span> if </span><span class="code even" style="--layer: 5" title="bb7: ../instrument-coverage/coverage_of_if_else.rs:11:15: 11:28:
11:15-11:28: StorageLive: StorageLive(_8)
11:15-11:24: StorageLive: StorageLive(_9)
11:15-11:24: Assign: _9 = _1
11:15-11:28: Assign: _8 = Gt(move _9, const 2_i32)
11:27-11:28: StorageDead: StorageDead(_9)
11:15-11:28: FakeRead: FakeRead(ForMatchedPlace, _8)
11:12-18:6: SwitchInt: switchInt(_8) -&gt; [false: bb11, otherwise: bb10]"><span class="annotation">@7:</span> countdown &gt; 2</span><span class="code even" style="--layer: 4" title="bb10: ../instrument-coverage/coverage_of_if_else.rs:11:12: 18:6:
11:12-18:6: FalseEdge: falseEdge -&gt; [real: bb12, imaginary: bb11]"><span class="annotation">@10:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 4" title="bb10: ../instrument-coverage/coverage_of_if_else.rs:11:12: 18:6:
11:12-18:6: FalseEdge: falseEdge -&gt; [real: bb12, imaginary: bb11]"> </span><span class="code odd" style="--layer: 5" title="bb22: ../instrument-coverage/coverage_of_if_else.rs:12:9: 14:10:
12:9-14:10: Assign: _10 = const ()
12:9-14:10: Goto: goto -&gt; bb24"><span class="annotation">@22</span></span><span class="code even" style="--layer: 6" title="bb23: ../instrument-coverage/coverage_of_if_else.rs:12:9: 14:10:
13:13-13:26: Assign: _1 = const 0_i32
12:61-14:10: Assign: _10 = const ()
12:9-14:10: Goto: goto -&gt; bb24"><span class="annotation">@23</span></span><span class="code even" style="--layer: 7" title="bb21: ../instrument-coverage/coverage_of_if_else.rs:12:9: 14:10:
12:9-14:10: FalseEdge: falseEdge -&gt; [real: bb23, imaginary: bb22]"><span class="annotation">@21:</span> if </span><span class="code even" style="--layer: 8" title="bb14: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:60:
12:12-12:60: Assign: _11 = const false
12:12-12:60: Goto: goto -&gt; bb16"><span class="annotation">@14</span></span><span class="code even" style="--layer: 9" title="bb15: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:60:
12:46-12:60: StorageLive: StorageLive(_17)
12:46-12:55: StorageLive: StorageLive(_18)
12:46-12:55: Assign: _18 = _1
12:46-12:60: Assign: _17 = Ne(move _18, const 9_i32)
12:59-12:60: StorageDead: StorageDead(_18)
12:12-12:60: SwitchInt: switchInt(move _17) -&gt; [false: bb14, otherwise: bb13]"><span class="annotation">@15</span></span><span class="code even" style="--layer: 10" title="bb16: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:60:
12:59-12:60: StorageDead: StorageDead(_17)
12:59-12:60: StorageDead: StorageDead(_12)
12:12-12:60: FakeRead: FakeRead(ForMatchedPlace, _11)
12:9-14:10: SwitchInt: switchInt(_11) -&gt; [false: bb22, otherwise: bb21]"><span class="annotation">@16</span></span><span class="code even" style="--layer: 11" title="bb13: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:60:
12:12-12:60: Assign: _11 = const true
12:12-12:60: Goto: goto -&gt; bb16"><span class="annotation">@13</span></span><span class="code even" style="--layer: 12" title="bb20: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:60:
12:41-12:42: StorageDead: StorageDead(_15)
12:41-12:42: StorageDead: StorageDead(_13)
12:12-12:60: SwitchInt: switchInt(move _12) -&gt; [false: bb15, otherwise: bb13]"><span class="annotation">@20</span></span><span class="code even" style="--layer: 13" title="bb12: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:60:
12:9-14:10: StorageLive: StorageLive(_10)
12:12-12:60: StorageLive: StorageLive(_11)
12:12-12:42: StorageLive: StorageLive(_12)
12:12-12:25: StorageLive: StorageLive(_13)
12:12-12:21: StorageLive: StorageLive(_14)
12:12-12:21: Assign: _14 = _1
12:12-12:25: Assign: _13 = Lt(move _14, const 1_i32)
12:24-12:25: StorageDead: StorageDead(_14)
12:12-12:42: SwitchInt: switchInt(move _13) -&gt; [false: bb19, otherwise: bb17]"><span class="annotation">@12</span></span><span class="code even" style="--layer: 14" title="bb18: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:42:
12:12-12:42: Assign: _12 = const false
12:12-12:42: Goto: goto -&gt; bb20"><span class="annotation">@18</span></span><span class="code even" style="--layer: 15" title="bb19: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:42:
12:29-12:42: StorageLive: StorageLive(_15)
12:29-12:38: StorageLive: StorageLive(_16)
12:29-12:38: Assign: _16 = _1
12:29-12:42: Assign: _15 = Gt(move _16, const 5_i32)
12:41-12:42: StorageDead: StorageDead(_16)
12:12-12:42: SwitchInt: switchInt(move _15) -&gt; [false: bb18, otherwise: bb17]"><span class="annotation">@19</span></span><span class="code even" style="--layer: 16" title="bb17: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:42:
12:12-12:42: Assign: _12 = const true
12:12-12:42: Goto: goto -&gt; bb20"><span class="annotation">@17:</span> countdown &lt; 1 || countdown &gt; 5</span><span class="code even" style="--layer: 13" title="bb12: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:60:
12:9-14:10: StorageLive: StorageLive(_10)
12:12-12:60: StorageLive: StorageLive(_11)
12:12-12:42: StorageLive: StorageLive(_12)
12:12-12:25: StorageLive: StorageLive(_13)
12:12-12:21: StorageLive: StorageLive(_14)
12:12-12:21: Assign: _14 = _1
12:12-12:25: Assign: _13 = Lt(move _14, const 1_i32)
12:24-12:25: StorageDead: StorageDead(_14)
12:12-12:42: SwitchInt: switchInt(move _13) -&gt; [false: bb19, otherwise: bb17]"><span class="annotation">@12:</span> || countdown != 9</span><span class="code even" style="--layer: 7" title="bb21: ../instrument-coverage/coverage_of_if_else.rs:12:9: 14:10:
12:9-14:10: FalseEdge: falseEdge -&gt; [real: bb23, imaginary: bb22]"><span class="annotation">@21:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 7" title="bb21: ../instrument-coverage/coverage_of_if_else.rs:12:9: 14:10:
12:9-14:10: FalseEdge: falseEdge -&gt; [real: bb23, imaginary: bb22]"> countdown = 0;</span></span>
<span class="line"><span class="code even" style="--layer: 7" title="bb21: ../instrument-coverage/coverage_of_if_else.rs:12:9: 14:10:
12:9-14:10: FalseEdge: falseEdge -&gt; [real: bb23, imaginary: bb22]"> </span><span class="code odd" style="--layer: 8" title="bb24: ../instrument-coverage/coverage_of_if_else.rs:14:9: 15:23:
14:9-14:10: StorageDead: StorageDead(_11)
14:9-14:10: StorageDead: StorageDead(_10)
15:9-15:23: Assign: _19 = CheckedSub(_1, const 5_i32)
15:9-15:23: Assert: assert(!move (_19.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _1, const 5_i32) -&gt; [success: bb25, unwind: bb1]"><span class="annotation">@24:</span> }</span></span>
<span class="line"><span class="code odd" style="--layer: 8" title="bb24: ../instrument-coverage/coverage_of_if_else.rs:14:9: 15:23:
14:9-14:10: StorageDead: StorageDead(_11)
14:9-14:10: StorageDead: StorageDead(_10)
15:9-15:23: Assign: _19 = CheckedSub(_1, const 5_i32)
15:9-15:23: Assert: assert(!move (_19.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _1, const 5_i32) -&gt; [success: bb25, unwind: bb1]"> countdown -= 5</span><span class="code even" style="--layer: 4" title="bb10: ../instrument-coverage/coverage_of_if_else.rs:11:12: 18:6:
11:12-18:6: FalseEdge: falseEdge -&gt; [real: bb12, imaginary: bb11]"><span class="annotation">@10:</span> ;</span></span>
<span class="line"><span class="code even" style="--layer: 4" title="bb10: ../instrument-coverage/coverage_of_if_else.rs:11:12: 18:6:
11:12-18:6: FalseEdge: falseEdge -&gt; [real: bb12, imaginary: bb11]"> } else {</span></span>
<span class="line"><span class="code even" style="--layer: 4" title="bb10: ../instrument-coverage/coverage_of_if_else.rs:11:12: 18:6:
11:12-18:6: FalseEdge: falseEdge -&gt; [real: bb12, imaginary: bb11]"> </span><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"><span class="annotation">@27</span></span><span class="code even" style="--layer: 6" title="bb11: ../instrument-coverage/coverage_of_if_else.rs:17:9: 18:6:
17:9-17:15: Assign: _0 = const ()
18:5-18:6: StorageDead: StorageDead(_8)
18:5-18:6: StorageDead: StorageDead(_5)
18:5-18:6: StorageDead: StorageDead(_4)
17:9-17:15: Goto: goto -&gt; bb27"><span class="annotation">@11:</span> return;</span></span>
<span class="line"><span class="code even" style="--layer: 6" title="bb11: ../instrument-coverage/coverage_of_if_else.rs:17:9: 18:6:
17:9-17:15: Assign: _0 = const ()
18:5-18:6: StorageDead: StorageDead(_8)
18:5-18:6: StorageDead: StorageDead(_5)
18:5-18:6: StorageDead: StorageDead(_4)
17:9-17:15: Goto: goto -&gt; bb27"> }</span><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"><span class="annotation">@27:</span> </span></span>
<span class="line"><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"></span></span>
<span class="line"><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"> let mut countdown = 0;</span></span>
<span class="line"><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"> </span><span class="code odd" style="--layer: 6" title="bb30: ../instrument-coverage/coverage_of_if_else.rs:21:5: 23:6:
21:5-23:6: Assign: _22 = const ()
21:5-23:6: Goto: goto -&gt; bb32"><span class="annotation">@30</span></span><span class="code even" style="--layer: 7" title="bb31: ../instrument-coverage/coverage_of_if_else.rs:21:5: 23:6:
22:9-22:23: Assign: _21 = const 10_i32
21:13-23:6: Assign: _22 = const ()
21:5-23:6: Goto: goto -&gt; bb32"><span class="annotation">@31</span></span><span class="code even" style="--layer: 8" title="bb29: ../instrument-coverage/coverage_of_if_else.rs:21:5: 23:6:
21:5-23:6: FalseEdge: falseEdge -&gt; [real: bb31, imaginary: bb30]"><span class="annotation">@29:</span> if </span><span class="code even" style="--layer: 9" title="bb28: ../instrument-coverage/coverage_of_if_else.rs:21:8: 21:12:
18:5-18:6: StorageDead: StorageDead(_5)
18:5-18:6: StorageDead: StorageDead(_4)
20:9-20:22: StorageLive: StorageLive(_21)
20:25-20:26: Assign: _21 = const 0_i32
20:9-20:22: FakeRead: FakeRead(ForLet, _21)
21:5-23:6: StorageLive: StorageLive(_22)
21:8-21:12: StorageLive: StorageLive(_23)
21:8-21:12: Assign: _23 = const true
21:8-21:12: FakeRead: FakeRead(ForMatchedPlace, _23)
21:5-23:6: SwitchInt: switchInt(_23) -&gt; [false: bb30, otherwise: bb29]"><span class="annotation">@28:</span> true</span><span class="code even" style="--layer: 8" title="bb29: ../instrument-coverage/coverage_of_if_else.rs:21:5: 23:6:
21:5-23:6: FalseEdge: falseEdge -&gt; [real: bb31, imaginary: bb30]"><span class="annotation">@29:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 8" title="bb29: ../instrument-coverage/coverage_of_if_else.rs:21:5: 23:6:
21:5-23:6: FalseEdge: falseEdge -&gt; [real: bb31, imaginary: bb30]"> countdown = 10;</span></span>
<span class="line"><span class="code even" style="--layer: 8" title="bb29: ../instrument-coverage/coverage_of_if_else.rs:21:5: 23:6:
21:5-23:6: FalseEdge: falseEdge -&gt; [real: bb31, imaginary: bb30]"> }</span><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"><span class="annotation">@27:</span> </span></span>
<span class="line"><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"></span></span>
<span class="line"><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"> </span><span class="code even" style="--layer: 6" title="bb33: ../instrument-coverage/coverage_of_if_else.rs:25:5: 34:6:
25:5-34:6: FalseEdge: falseEdge -&gt; [real: bb35, imaginary: bb34]"><span class="annotation">@33</span></span><span class="code even" style="--layer: 7" title="bb52: ../instrument-coverage/coverage_of_if_else.rs:25:5: 34:6:
31:9-31:23: Assign: _21 = move (_39.0: i32)
27:29-32:6: Assign: _24 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
25:5-34:6: Goto: goto -&gt; bb53"><span class="annotation">@52</span></span><span class="code even" style="--layer: 8" title="bb36: ../instrument-coverage/coverage_of_if_else.rs:25:5: 34:6:
26:9-26:23: Assign: _21 = move (_27.0: i32)
25:22-27:6: Assign: _24 = const ()
25:5-34:6: Goto: goto -&gt; bb53"><span class="annotation">@36:</span> if </span><span class="code even" style="--layer: 9" title="bb32: ../instrument-coverage/coverage_of_if_else.rs:25:8: 25:21:
23:5-23:6: StorageDead: StorageDead(_23)
23:5-23:6: StorageDead: StorageDead(_22)
25:5-34:6: StorageLive: StorageLive(_24)
25:8-25:21: StorageLive: StorageLive(_25)
25:8-25:17: StorageLive: StorageLive(_26)
25:8-25:17: Assign: _26 = _21
25:8-25:21: Assign: _25 = Gt(move _26, const 7_i32)
25:20-25:21: StorageDead: StorageDead(_26)
25:8-25:21: FakeRead: FakeRead(ForMatchedPlace, _25)
25:5-34:6: SwitchInt: switchInt(_25) -&gt; [false: bb34, otherwise: bb33]"><span class="annotation">@32:</span> countdown &gt; 7</span><span class="code even" style="--layer: 8" title="bb36: ../instrument-coverage/coverage_of_if_else.rs:25:5: 34:6:
26:9-26:23: Assign: _21 = move (_27.0: i32)
25:22-27:6: Assign: _24 = const ()
25:5-34:6: Goto: goto -&gt; bb53"><span class="annotation">@36:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 8" title="bb36: ../instrument-coverage/coverage_of_if_else.rs:25:5: 34:6:
26:9-26:23: Assign: _21 = move (_27.0: i32)
25:22-27:6: Assign: _24 = const ()
25:5-34:6: Goto: goto -&gt; bb53"> </span><span class="code odd" style="--layer: 9" title="bb35: ../instrument-coverage/coverage_of_if_else.rs:26:9: 26:23:
26:9-26:23: Assign: _27 = CheckedSub(_21, const 4_i32)
26:9-26:23: Assert: assert(!move (_27.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _21, const 4_i32) -&gt; [success: bb36, unwind: bb1]"><span class="annotation">@35:</span> countdown -= 4</span><span class="code even" style="--layer: 8" title="bb36: ../instrument-coverage/coverage_of_if_else.rs:25:5: 34:6:
26:9-26:23: Assign: _21 = move (_27.0: i32)
25:22-27:6: Assign: _24 = const ()
25:5-34:6: Goto: goto -&gt; bb53"><span class="annotation">@36:</span> ;</span></span>
<span class="line"><span class="code even" style="--layer: 8" title="bb36: ../instrument-coverage/coverage_of_if_else.rs:25:5: 34:6:
26:9-26:23: Assign: _21 = move (_27.0: i32)
25:22-27:6: Assign: _24 = const ()
25:5-34:6: Goto: goto -&gt; bb53"> } else </span><span class="code even" style="--layer: 9" title="bb37: ../instrument-coverage/coverage_of_if_else.rs:27:12: 34:6:
27:12-34:6: FalseEdge: falseEdge -&gt; [real: bb39, imaginary: bb38]"><span class="annotation">@37:</span> if </span><span class="code even" style="--layer: 10" title="bb34: ../instrument-coverage/coverage_of_if_else.rs:27:15: 27:28:
27:15-27:28: StorageLive: StorageLive(_28)
27:15-27:24: StorageLive: StorageLive(_29)
27:15-27:24: Assign: _29 = _21
27:15-27:28: Assign: _28 = Gt(move _29, const 2_i32)
27:27-27:28: StorageDead: StorageDead(_29)
27:15-27:28: FakeRead: FakeRead(ForMatchedPlace, _28)
27:12-34:6: SwitchInt: switchInt(_28) -&gt; [false: bb38, otherwise: bb37]"><span class="annotation">@34:</span> countdown &gt; 2</span><span class="code even" style="--layer: 9" title="bb37: ../instrument-coverage/coverage_of_if_else.rs:27:12: 34:6:
27:12-34:6: FalseEdge: falseEdge -&gt; [real: bb39, imaginary: bb38]"><span class="annotation">@37:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 9" title="bb37: ../instrument-coverage/coverage_of_if_else.rs:27:12: 34:6:
27:12-34:6: FalseEdge: falseEdge -&gt; [real: bb39, imaginary: bb38]"> </span><span class="code odd" style="--layer: 10" title="bb48: ../instrument-coverage/coverage_of_if_else.rs:28:9: 30:10:
28:9-30:10: FalseEdge: falseEdge -&gt; [real: bb50, imaginary: bb49]"><span class="annotation">@48</span></span><span class="code even" style="--layer: 11" title="bb50: ../instrument-coverage/coverage_of_if_else.rs:28:9: 30:10:
29:13-29:26: Assign: _21 = const 0_i32
28:61-30:10: Assign: _30 = const ()
28:9-30:10: Goto: goto -&gt; bb51"><span class="annotation">@50</span></span><span class="code even" style="--layer: 12" title="bb49: ../instrument-coverage/coverage_of_if_else.rs:28:9: 30:10:
28:9-30:10: Assign: _30 = const ()
28:9-30:10: Goto: goto -&gt; bb51"><span class="annotation">@49:</span> if </span><span class="code even" style="--layer: 13" title="bb39: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:60:
28:9-30:10: StorageLive: StorageLive(_30)
28:12-28:60: StorageLive: StorageLive(_31)
28:12-28:42: StorageLive: StorageLive(_32)
28:12-28:25: StorageLive: StorageLive(_33)
28:12-28:21: StorageLive: StorageLive(_34)
28:12-28:21: Assign: _34 = _21
28:12-28:25: Assign: _33 = Lt(move _34, const 1_i32)
28:24-28:25: StorageDead: StorageDead(_34)
28:12-28:42: SwitchInt: switchInt(move _33) -&gt; [false: bb46, otherwise: bb44]"><span class="annotation">@39</span></span><span class="code even" style="--layer: 14" title="bb47: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:60:
28:41-28:42: StorageDead: StorageDead(_35)
28:41-28:42: StorageDead: StorageDead(_33)
28:12-28:60: SwitchInt: switchInt(move _32) -&gt; [false: bb42, otherwise: bb40]"><span class="annotation">@47</span></span><span class="code even" style="--layer: 15" title="bb40: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:60:
28:12-28:60: Assign: _31 = const true
28:12-28:60: Goto: goto -&gt; bb43"><span class="annotation">@40</span></span><span class="code even" style="--layer: 16" title="bb43: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:60:
28:59-28:60: StorageDead: StorageDead(_37)
28:59-28:60: StorageDead: StorageDead(_32)
28:12-28:60: FakeRead: FakeRead(ForMatchedPlace, _31)
28:9-30:10: SwitchInt: switchInt(_31) -&gt; [false: bb49, otherwise: bb48]"><span class="annotation">@43</span></span><span class="code even" style="--layer: 17" title="bb42: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:60:
28:46-28:60: StorageLive: StorageLive(_37)
28:46-28:55: StorageLive: StorageLive(_38)
28:46-28:55: Assign: _38 = _21
28:46-28:60: Assign: _37 = Ne(move _38, const 9_i32)
28:59-28:60: StorageDead: StorageDead(_38)
28:12-28:60: SwitchInt: switchInt(move _37) -&gt; [false: bb41, otherwise: bb40]"><span class="annotation">@42</span></span><span class="code even" style="--layer: 18" title="bb41: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:60:
28:12-28:60: Assign: _31 = const false
28:12-28:60: Goto: goto -&gt; bb43"><span class="annotation">@41</span></span><span class="code even" style="--layer: 19" title="bb46: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:42:
28:29-28:42: StorageLive: StorageLive(_35)
28:29-28:38: StorageLive: StorageLive(_36)
28:29-28:38: Assign: _36 = _21
28:29-28:42: Assign: _35 = Gt(move _36, const 5_i32)
28:41-28:42: StorageDead: StorageDead(_36)
28:12-28:42: SwitchInt: switchInt(move _35) -&gt; [false: bb45, otherwise: bb44]"><span class="annotation">@46</span></span><span class="code even" style="--layer: 20" title="bb45: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:42:
28:12-28:42: Assign: _32 = const false
28:12-28:42: Goto: goto -&gt; bb47"><span class="annotation">@45</span></span><span class="code even" style="--layer: 21" title="bb44: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:42:
28:12-28:42: Assign: _32 = const true
28:12-28:42: Goto: goto -&gt; bb47"><span class="annotation">@44:</span> countdown &lt; 1 || countdown &gt; 5</span><span class="code even" style="--layer: 18" title="bb41: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:60:
28:12-28:60: Assign: _31 = const false
28:12-28:60: Goto: goto -&gt; bb43"><span class="annotation">@41:</span> || countdown != 9</span><span class="code even" style="--layer: 12" title="bb49: ../instrument-coverage/coverage_of_if_else.rs:28:9: 30:10:
28:9-30:10: Assign: _30 = const ()
28:9-30:10: Goto: goto -&gt; bb51"><span class="annotation">@49:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 12" title="bb49: ../instrument-coverage/coverage_of_if_else.rs:28:9: 30:10:
28:9-30:10: Assign: _30 = const ()
28:9-30:10: Goto: goto -&gt; bb51"> countdown = 0;</span></span>
<span class="line"><span class="code even" style="--layer: 12" title="bb49: ../instrument-coverage/coverage_of_if_else.rs:28:9: 30:10:
28:9-30:10: Assign: _30 = const ()
28:9-30:10: Goto: goto -&gt; bb51"> </span><span class="code odd" style="--layer: 13" title="bb51: ../instrument-coverage/coverage_of_if_else.rs:30:9: 31:23:
30:9-30:10: StorageDead: StorageDead(_31)
30:9-30:10: StorageDead: StorageDead(_30)
31:9-31:23: Assign: _39 = CheckedSub(_21, const 5_i32)
31:9-31:23: Assert: assert(!move (_39.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _21, const 5_i32) -&gt; [success: bb52, unwind: bb1]"><span class="annotation">@51:</span> }</span></span>
<span class="line"><span class="code odd" style="--layer: 13" title="bb51: ../instrument-coverage/coverage_of_if_else.rs:30:9: 31:23:
30:9-30:10: StorageDead: StorageDead(_31)
30:9-30:10: StorageDead: StorageDead(_30)
31:9-31:23: Assign: _39 = CheckedSub(_21, const 5_i32)
31:9-31:23: Assert: assert(!move (_39.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _21, const 5_i32) -&gt; [success: bb52, unwind: bb1]"> countdown -= 5</span><span class="code even" style="--layer: 9" title="bb37: ../instrument-coverage/coverage_of_if_else.rs:27:12: 34:6:
27:12-34:6: FalseEdge: falseEdge -&gt; [real: bb39, imaginary: bb38]"><span class="annotation">@37:</span> ;</span></span>
<span class="line"><span class="code even" style="--layer: 9" title="bb37: ../instrument-coverage/coverage_of_if_else.rs:27:12: 34:6:
27:12-34:6: FalseEdge: falseEdge -&gt; [real: bb39, imaginary: bb38]"> } else {</span></span>
<span class="line"><span class="code even" style="--layer: 9" title="bb37: ../instrument-coverage/coverage_of_if_else.rs:27:12: 34:6:
27:12-34:6: FalseEdge: falseEdge -&gt; [real: bb39, imaginary: bb38]"> </span><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"><span class="annotation">@38:</span> return;</span></span>
<span class="line"><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"> }</span></span>
<span class="line"><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"></span></span>
<span class="line"><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"> let mut countdown = 0;</span></span>
<span class="line"><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"> </span><span class="code even" style="--layer: 11" title="bb56: ../instrument-coverage/coverage_of_if_else.rs:37:5: 39:6:
38:9-38:23: Assign: _41 = const 10_i32
37:13-39:6: Assign: _42 = const ()
37:5-39:6: Goto: goto -&gt; bb57"><span class="annotation">@56</span></span><span class="code even" style="--layer: 12" title="bb54: ../instrument-coverage/coverage_of_if_else.rs:37:5: 39:6:
37:5-39:6: FalseEdge: falseEdge -&gt; [real: bb56, imaginary: bb55]"><span class="annotation">@54</span></span><span class="code even" style="--layer: 13" title="bb55: ../instrument-coverage/coverage_of_if_else.rs:37:5: 39:6:
37:5-39:6: Assign: _42 = const ()
37:5-39:6: Goto: goto -&gt; bb57"><span class="annotation">@55:</span> if </span><span class="code even" style="--layer: 14" title="bb53: ../instrument-coverage/coverage_of_if_else.rs:37:8: 37:12:
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
36:9-36:22: StorageLive: StorageLive(_41)
36:25-36:26: Assign: _41 = const 0_i32
36:9-36:22: FakeRead: FakeRead(ForLet, _41)
37:5-39:6: StorageLive: StorageLive(_42)
37:8-37:12: StorageLive: StorageLive(_43)
37:8-37:12: Assign: _43 = const true
37:8-37:12: FakeRead: FakeRead(ForMatchedPlace, _43)
37:5-39:6: SwitchInt: switchInt(_43) -&gt; [false: bb55, otherwise: bb54]"><span class="annotation">@53:</span> true</span><span class="code even" style="--layer: 13" title="bb55: ../instrument-coverage/coverage_of_if_else.rs:37:5: 39:6:
37:5-39:6: Assign: _42 = const ()
37:5-39:6: Goto: goto -&gt; bb57"><span class="annotation">@55:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 13" title="bb55: ../instrument-coverage/coverage_of_if_else.rs:37:5: 39:6:
37:5-39:6: Assign: _42 = const ()
37:5-39:6: Goto: goto -&gt; bb57"> countdown = 10;</span></span>
<span class="line"><span class="code even" style="--layer: 13" title="bb55: ../instrument-coverage/coverage_of_if_else.rs:37:5: 39:6:
37:5-39:6: Assign: _42 = const ()
37:5-39:6: Goto: goto -&gt; bb57"> }</span><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"><span class="annotation">@38:</span> </span></span>
<span class="line"><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"></span></span>
<span class="line"><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"> </span><span class="code odd" style="--layer: 11" title="bb61: ../instrument-coverage/coverage_of_if_else.rs:41:5: 50:6:
42:9-42:23: Assign: _41 = move (_46.0: i32)
41:22-43:6: Assign: _0 = const ()
41:5-50:6: Goto: goto -&gt; bb78"><span class="annotation">@61</span></span><span class="code even" style="--layer: 12" title="bb58: ../instrument-coverage/coverage_of_if_else.rs:41:5: 50:6:
41:5-50:6: FalseEdge: falseEdge -&gt; [real: bb60, imaginary: bb59]"><span class="annotation">@58</span></span><span class="code even" style="--layer: 13" title="bb77: ../instrument-coverage/coverage_of_if_else.rs:41:5: 50:6:
47:9-47:23: Assign: _41 = move (_58.0: i32)
43:29-48:6: Assign: _0 = const ()
50:5-50:6: StorageDead: StorageDead(_47)
41:5-50:6: Goto: goto -&gt; bb78"><span class="annotation">@77:</span> if </span><span class="code even" style="--layer: 14" title="bb57: ../instrument-coverage/coverage_of_if_else.rs:41:8: 41:21:
39:5-39:6: StorageDead: StorageDead(_43)
39:5-39:6: StorageDead: StorageDead(_42)
41:8-41:21: StorageLive: StorageLive(_44)
41:8-41:17: StorageLive: StorageLive(_45)
41:8-41:17: Assign: _45 = _41
41:8-41:21: Assign: _44 = Gt(move _45, const 7_i32)
41:20-41:21: StorageDead: StorageDead(_45)
41:8-41:21: FakeRead: FakeRead(ForMatchedPlace, _44)
41:5-50:6: SwitchInt: switchInt(_44) -&gt; [false: bb59, otherwise: bb58]"><span class="annotation">@57:</span> countdown &gt; 7</span><span class="code even" style="--layer: 13" title="bb77: ../instrument-coverage/coverage_of_if_else.rs:41:5: 50:6:
47:9-47:23: Assign: _41 = move (_58.0: i32)
43:29-48:6: Assign: _0 = const ()
50:5-50:6: StorageDead: StorageDead(_47)
41:5-50:6: Goto: goto -&gt; bb78"><span class="annotation">@77:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 13" title="bb77: ../instrument-coverage/coverage_of_if_else.rs:41:5: 50:6:
47:9-47:23: Assign: _41 = move (_58.0: i32)
43:29-48:6: Assign: _0 = const ()
50:5-50:6: StorageDead: StorageDead(_47)
41:5-50:6: Goto: goto -&gt; bb78"> </span><span class="code odd" style="--layer: 14" title="bb60: ../instrument-coverage/coverage_of_if_else.rs:42:9: 42:23:
42:9-42:23: Assign: _46 = CheckedSub(_41, const 4_i32)
42:9-42:23: Assert: assert(!move (_46.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _41, const 4_i32) -&gt; [success: bb61, unwind: bb1]"><span class="annotation">@60:</span> countdown -= 4</span><span class="code even" style="--layer: 13" title="bb77: ../instrument-coverage/coverage_of_if_else.rs:41:5: 50:6:
47:9-47:23: Assign: _41 = move (_58.0: i32)
43:29-48:6: Assign: _0 = const ()
50:5-50:6: StorageDead: StorageDead(_47)
41:5-50:6: Goto: goto -&gt; bb78"><span class="annotation">@77:</span> ;</span></span>
<span class="line"><span class="code even" style="--layer: 13" title="bb77: ../instrument-coverage/coverage_of_if_else.rs:41:5: 50:6:
47:9-47:23: Assign: _41 = move (_58.0: i32)
43:29-48:6: Assign: _0 = const ()
50:5-50:6: StorageDead: StorageDead(_47)
41:5-50:6: Goto: goto -&gt; bb78"> } else </span><span class="code even" style="--layer: 14" title="bb62: ../instrument-coverage/coverage_of_if_else.rs:43:12: 50:6:
43:12-50:6: FalseEdge: falseEdge -&gt; [real: bb64, imaginary: bb63]"><span class="annotation">@62:</span> if </span><span class="code even" style="--layer: 15" title="bb59: ../instrument-coverage/coverage_of_if_else.rs:43:15: 43:28:
43:15-43:28: StorageLive: StorageLive(_47)
43:15-43:24: StorageLive: StorageLive(_48)
43:15-43:24: Assign: _48 = _41
43:15-43:28: Assign: _47 = Gt(move _48, const 2_i32)
43:27-43:28: StorageDead: StorageDead(_48)
43:15-43:28: FakeRead: FakeRead(ForMatchedPlace, _47)
43:12-50:6: SwitchInt: switchInt(_47) -&gt; [false: bb63, otherwise: bb62]"><span class="annotation">@59:</span> countdown &gt; 2</span><span class="code even" style="--layer: 14" title="bb62: ../instrument-coverage/coverage_of_if_else.rs:43:12: 50:6:
43:12-50:6: FalseEdge: falseEdge -&gt; [real: bb64, imaginary: bb63]"><span class="annotation">@62:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 14" title="bb62: ../instrument-coverage/coverage_of_if_else.rs:43:12: 50:6:
43:12-50:6: FalseEdge: falseEdge -&gt; [real: bb64, imaginary: bb63]"> </span><span class="code odd" style="--layer: 15" title="bb75: ../instrument-coverage/coverage_of_if_else.rs:44:9: 46:10:
45:13-45:26: Assign: _41 = const 0_i32
44:61-46:10: Assign: _49 = const ()
44:9-46:10: Goto: goto -&gt; bb76"><span class="annotation">@75</span></span><span class="code even" style="--layer: 16" title="bb74: ../instrument-coverage/coverage_of_if_else.rs:44:9: 46:10:
44:9-46:10: Assign: _49 = const ()
44:9-46:10: Goto: goto -&gt; bb76"><span class="annotation">@74</span></span><span class="code even" style="--layer: 17" title="bb73: ../instrument-coverage/coverage_of_if_else.rs:44:9: 46:10:
44:9-46:10: FalseEdge: falseEdge -&gt; [real: bb75, imaginary: bb74]"><span class="annotation">@73:</span> if </span><span class="code even" style="--layer: 18" title="bb67: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:60:
44:46-44:60: StorageLive: StorageLive(_56)
44:46-44:55: StorageLive: StorageLive(_57)
44:46-44:55: Assign: _57 = _41
44:46-44:60: Assign: _56 = Ne(move _57, const 9_i32)
44:59-44:60: StorageDead: StorageDead(_57)
44:12-44:60: SwitchInt: switchInt(move _56) -&gt; [false: bb66, otherwise: bb65]"><span class="annotation">@67</span></span><span class="code even" style="--layer: 19" title="bb68: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:60:
44:59-44:60: StorageDead: StorageDead(_56)
44:59-44:60: StorageDead: StorageDead(_51)
44:12-44:60: FakeRead: FakeRead(ForMatchedPlace, _50)
44:9-46:10: SwitchInt: switchInt(_50) -&gt; [false: bb74, otherwise: bb73]"><span class="annotation">@68</span></span><span class="code even" style="--layer: 20" title="bb65: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:60:
44:12-44:60: Assign: _50 = const true
44:12-44:60: Goto: goto -&gt; bb68"><span class="annotation">@65</span></span><span class="code even" style="--layer: 21" title="bb72: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:60:
44:41-44:42: StorageDead: StorageDead(_54)
44:41-44:42: StorageDead: StorageDead(_52)
44:12-44:60: SwitchInt: switchInt(move _51) -&gt; [false: bb67, otherwise: bb65]"><span class="annotation">@72</span></span><span class="code even" style="--layer: 22" title="bb64: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:60:
44:9-46:10: StorageLive: StorageLive(_49)
44:12-44:60: StorageLive: StorageLive(_50)
44:12-44:42: StorageLive: StorageLive(_51)
44:12-44:25: StorageLive: StorageLive(_52)
44:12-44:21: StorageLive: StorageLive(_53)
44:12-44:21: Assign: _53 = _41
44:12-44:25: Assign: _52 = Lt(move _53, const 1_i32)
44:24-44:25: StorageDead: StorageDead(_53)
44:12-44:42: SwitchInt: switchInt(move _52) -&gt; [false: bb71, otherwise: bb69]"><span class="annotation">@64</span></span><span class="code even" style="--layer: 23" title="bb66: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:60:
44:12-44:60: Assign: _50 = const false
44:12-44:60: Goto: goto -&gt; bb68"><span class="annotation">@66</span></span><span class="code even" style="--layer: 24" title="bb69: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:42:
44:12-44:42: Assign: _51 = const true
44:12-44:42: Goto: goto -&gt; bb72"><span class="annotation">@69</span></span><span class="code even" style="--layer: 25" title="bb71: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:42:
44:29-44:42: StorageLive: StorageLive(_54)
44:29-44:38: StorageLive: StorageLive(_55)
44:29-44:38: Assign: _55 = _41
44:29-44:42: Assign: _54 = Gt(move _55, const 5_i32)
44:41-44:42: StorageDead: StorageDead(_55)
44:12-44:42: SwitchInt: switchInt(move _54) -&gt; [false: bb70, otherwise: bb69]"><span class="annotation">@71</span></span><span class="code even" style="--layer: 26" title="bb70: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:42:
44:12-44:42: Assign: _51 = const false
44:12-44:42: Goto: goto -&gt; bb72"><span class="annotation">@70:</span> countdown &lt; 1 || countdown &gt; 5</span><span class="code even" style="--layer: 23" title="bb66: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:60:
44:12-44:60: Assign: _50 = const false
44:12-44:60: Goto: goto -&gt; bb68"><span class="annotation">@66:</span> || countdown != 9</span><span class="code even" style="--layer: 17" title="bb73: ../instrument-coverage/coverage_of_if_else.rs:44:9: 46:10:
44:9-46:10: FalseEdge: falseEdge -&gt; [real: bb75, imaginary: bb74]"><span class="annotation">@73:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 17" title="bb73: ../instrument-coverage/coverage_of_if_else.rs:44:9: 46:10:
44:9-46:10: FalseEdge: falseEdge -&gt; [real: bb75, imaginary: bb74]"> countdown = 0;</span></span>
<span class="line"><span class="code even" style="--layer: 17" title="bb73: ../instrument-coverage/coverage_of_if_else.rs:44:9: 46:10:
44:9-46:10: FalseEdge: falseEdge -&gt; [real: bb75, imaginary: bb74]"> </span><span class="code odd" style="--layer: 18" title="bb76: ../instrument-coverage/coverage_of_if_else.rs:46:9: 47:23:
46:9-46:10: StorageDead: StorageDead(_50)
46:9-46:10: StorageDead: StorageDead(_49)
47:9-47:23: Assign: _58 = CheckedSub(_41, const 5_i32)
47:9-47:23: Assert: assert(!move (_58.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _41, const 5_i32) -&gt; [success: bb77, unwind: bb1]"><span class="annotation">@76:</span> }</span></span>
<span class="line"><span class="code odd" style="--layer: 18" title="bb76: ../instrument-coverage/coverage_of_if_else.rs:46:9: 47:23:
46:9-46:10: StorageDead: StorageDead(_50)
46:9-46:10: StorageDead: StorageDead(_49)
47:9-47:23: Assign: _58 = CheckedSub(_41, const 5_i32)
47:9-47:23: Assert: assert(!move (_58.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _41, const 5_i32) -&gt; [success: bb77, unwind: bb1]"> countdown -= 5</span><span class="code even" style="--layer: 14" title="bb62: ../instrument-coverage/coverage_of_if_else.rs:43:12: 50:6:
43:12-50:6: FalseEdge: falseEdge -&gt; [real: bb64, imaginary: bb63]"><span class="annotation">@62:</span> ;</span></span>
<span class="line"><span class="code even" style="--layer: 14" title="bb62: ../instrument-coverage/coverage_of_if_else.rs:43:12: 50:6:
43:12-50:6: FalseEdge: falseEdge -&gt; [real: bb64, imaginary: bb63]"> } else {</span></span>
<span class="line"><span class="code even" style="--layer: 14" title="bb62: ../instrument-coverage/coverage_of_if_else.rs:43:12: 50:6:
43:12-50:6: FalseEdge: falseEdge -&gt; [real: bb64, imaginary: bb63]"> </span><span class="code even" style="--layer: 15" title="bb63: ../instrument-coverage/coverage_of_if_else.rs:49:9: 51:2:
49:9-49:15: Assign: _0 = const ()
50:5-50:6: StorageDead: StorageDead(_47)
51:1-51:2: StorageDead: StorageDead(_41)
51:1-51:2: StorageDead: StorageDead(_21)
51:1-51:2: StorageDead: StorageDead(_1)
51:1-51:2: StorageDead: StorageDead(_44)
49:9-49:15: Goto: goto -&gt; bb26"><span class="annotation">@63:</span> return;</span></span>
<span class="line"><span class="code even" style="--layer: 15" title="bb63: ../instrument-coverage/coverage_of_if_else.rs:49:9: 51:2:
49:9-49:15: Assign: _0 = const ()
50:5-50:6: StorageDead: StorageDead(_47)
51:1-51:2: StorageDead: StorageDead(_41)
51:1-51:2: StorageDead: StorageDead(_21)
51:1-51:2: StorageDead: StorageDead(_1)
51:1-51:2: StorageDead: StorageDead(_44)
49:9-49:15: Goto: goto -&gt; bb26"> }</span><span class="code even" style="--layer: 16" title="bb78: ../instrument-coverage/coverage_of_if_else.rs:51:1: 51:2:
51:1-51:2: StorageDead: StorageDead(_41)
51:1-51:2: StorageDead: StorageDead(_21)
51:1-51:2: StorageDead: StorageDead(_1)
51:1-51:2: StorageDead: StorageDead(_44)
51:2-51:2: Goto: goto -&gt; bb26"><span class="annotation">@78:</span> }</span><span><span class="code even" style="--layer: 1" title="bb26: ../instrument-coverage/coverage_of_if_else.rs:51:2: 51:2:
51:2-51:2: Return: return"><span class="annotation">@26</span></span></span></span></div>
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# needs-profiler-support
# ignore-msvc
# LINK_DEAD_CODE requires ignore-msvc due to Issue #76038
LINK_DEAD_CODE=yes
-include ../instrument-coverage-mir-cov-html-base/Makefile
# ISSUE(76038): When targeting MSVC, Rust binaries built with both `-Z instrument-coverage` and
# `-C link-dead-code` typically crash (with a seg-fault) or at best generate an empty `*.profraw`.
# See ../instrument-coverage/coverage_tools.mk for more information.

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<!DOCTYPE html>
<html>
<head>
<title>coverage_of_if_else - Code Regions</title>
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<div class="code" style="counter-reset: line 2"><span class="line"><span class="code" style="--layer: 0">fn main() {</span></span>
<span class="line"><span class="code" style="--layer: 0"> let mut countdown = 0;</span></span>
<span class="line"><span class="code" style="--layer: 0"> </span><span><span class="code even" style="--layer: 1" title="bb2: ../instrument-coverage/coverage_of_if_else.rs:5:5: 7:6:
5:5-7:6: FalseEdge: falseEdge -&gt; [real: bb4, imaginary: bb3]"><span class="annotation">@2</span></span></span><span class="code even" style="--layer: 2" title="bb4: ../instrument-coverage/coverage_of_if_else.rs:5:5: 7:6:
6:9-6:23: Assign: _1 = const 10_i32
5:13-7:6: Assign: _2 = const ()
5:5-7:6: Goto: goto -&gt; bb5"><span class="annotation">@4</span></span><span class="code even" style="--layer: 3" title="bb3: ../instrument-coverage/coverage_of_if_else.rs:5:5: 7:6:
5:5-7:6: Assign: _2 = const ()
5:5-7:6: Goto: goto -&gt; bb5"><span class="annotation">@3:</span> if </span><span class="code even" style="--layer: 4" title="bb0: ../instrument-coverage/coverage_of_if_else.rs:5:8: 5:12:
4:9-4:22: StorageLive: StorageLive(_1)
4:25-4:26: Assign: _1 = const 0_i32
4:9-4:22: FakeRead: FakeRead(ForLet, _1)
5:5-7:6: StorageLive: StorageLive(_2)
5:8-5:12: StorageLive: StorageLive(_3)
5:8-5:12: Assign: _3 = const true
5:8-5:12: FakeRead: FakeRead(ForMatchedPlace, _3)
5:5-7:6: SwitchInt: switchInt(_3) -&gt; [false: bb3, otherwise: bb2]"><span class="annotation">@0:</span> true</span><span class="code even" style="--layer: 3" title="bb3: ../instrument-coverage/coverage_of_if_else.rs:5:5: 7:6:
5:5-7:6: Assign: _2 = const ()
5:5-7:6: Goto: goto -&gt; bb5"><span class="annotation">@3:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 3" title="bb3: ../instrument-coverage/coverage_of_if_else.rs:5:5: 7:6:
5:5-7:6: Assign: _2 = const ()
5:5-7:6: Goto: goto -&gt; bb5"> countdown = 10;</span></span>
<span class="line"><span class="code even" style="--layer: 3" title="bb3: ../instrument-coverage/coverage_of_if_else.rs:5:5: 7:6:
5:5-7:6: Assign: _2 = const ()
5:5-7:6: Goto: goto -&gt; bb5"> }</span><span class="code" style="--layer: 0"></span></span>
<span class="line"><span class="code" style="--layer: 0"></span></span>
<span class="line"><span class="code" style="--layer: 0"> </span><span><span class="code even" style="--layer: 1" title="bb6: ../instrument-coverage/coverage_of_if_else.rs:9:5: 18:6:
9:5-18:6: FalseEdge: falseEdge -&gt; [real: bb8, imaginary: bb7]"><span class="annotation">@6</span></span></span><span class="code even" style="--layer: 2" title="bb9: ../instrument-coverage/coverage_of_if_else.rs:9:5: 18:6:
10:9-10:23: Assign: _1 = move (_7.0: i32)
9:22-11:6: Assign: _4 = const ()
9:5-18:6: Goto: goto -&gt; bb28"><span class="annotation">@9</span></span><span class="code even" style="--layer: 3" title="bb25: ../instrument-coverage/coverage_of_if_else.rs:9:5: 18:6:
15:9-15:23: Assign: _1 = move (_19.0: i32)
11:29-16:6: Assign: _4 = const ()
18:5-18:6: StorageDead: StorageDead(_8)
9:5-18:6: Goto: goto -&gt; bb28"><span class="annotation">@25:</span> if </span><span class="code even" style="--layer: 4" title="bb5: ../instrument-coverage/coverage_of_if_else.rs:9:8: 9:21:
7:5-7:6: StorageDead: StorageDead(_3)
7:5-7:6: StorageDead: StorageDead(_2)
9:5-18:6: StorageLive: StorageLive(_4)
9:8-9:21: StorageLive: StorageLive(_5)
9:8-9:17: StorageLive: StorageLive(_6)
9:8-9:17: Assign: _6 = _1
9:8-9:21: Assign: _5 = Gt(move _6, const 7_i32)
9:20-9:21: StorageDead: StorageDead(_6)
9:8-9:21: FakeRead: FakeRead(ForMatchedPlace, _5)
9:5-18:6: SwitchInt: switchInt(_5) -&gt; [false: bb7, otherwise: bb6]"><span class="annotation">@5:</span> countdown &gt; 7</span><span class="code even" style="--layer: 3" title="bb25: ../instrument-coverage/coverage_of_if_else.rs:9:5: 18:6:
15:9-15:23: Assign: _1 = move (_19.0: i32)
11:29-16:6: Assign: _4 = const ()
18:5-18:6: StorageDead: StorageDead(_8)
9:5-18:6: Goto: goto -&gt; bb28"><span class="annotation">@25:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 3" title="bb25: ../instrument-coverage/coverage_of_if_else.rs:9:5: 18:6:
15:9-15:23: Assign: _1 = move (_19.0: i32)
11:29-16:6: Assign: _4 = const ()
18:5-18:6: StorageDead: StorageDead(_8)
9:5-18:6: Goto: goto -&gt; bb28"> </span><span class="code odd" style="--layer: 4" title="bb8: ../instrument-coverage/coverage_of_if_else.rs:10:9: 10:23:
10:9-10:23: Assign: _7 = CheckedSub(_1, const 4_i32)
10:9-10:23: Assert: assert(!move (_7.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _1, const 4_i32) -&gt; [success: bb9, unwind: bb1]"><span class="annotation">@8:</span> countdown -= 4</span><span class="code even" style="--layer: 3" title="bb25: ../instrument-coverage/coverage_of_if_else.rs:9:5: 18:6:
15:9-15:23: Assign: _1 = move (_19.0: i32)
11:29-16:6: Assign: _4 = const ()
18:5-18:6: StorageDead: StorageDead(_8)
9:5-18:6: Goto: goto -&gt; bb28"><span class="annotation">@25:</span> ;</span></span>
<span class="line"><span class="code even" style="--layer: 3" title="bb25: ../instrument-coverage/coverage_of_if_else.rs:9:5: 18:6:
15:9-15:23: Assign: _1 = move (_19.0: i32)
11:29-16:6: Assign: _4 = const ()
18:5-18:6: StorageDead: StorageDead(_8)
9:5-18:6: Goto: goto -&gt; bb28"> } else </span><span class="code even" style="--layer: 4" title="bb10: ../instrument-coverage/coverage_of_if_else.rs:11:12: 18:6:
11:12-18:6: FalseEdge: falseEdge -&gt; [real: bb12, imaginary: bb11]"><span class="annotation">@10:</span> if </span><span class="code even" style="--layer: 5" title="bb7: ../instrument-coverage/coverage_of_if_else.rs:11:15: 11:28:
11:15-11:28: StorageLive: StorageLive(_8)
11:15-11:24: StorageLive: StorageLive(_9)
11:15-11:24: Assign: _9 = _1
11:15-11:28: Assign: _8 = Gt(move _9, const 2_i32)
11:27-11:28: StorageDead: StorageDead(_9)
11:15-11:28: FakeRead: FakeRead(ForMatchedPlace, _8)
11:12-18:6: SwitchInt: switchInt(_8) -&gt; [false: bb11, otherwise: bb10]"><span class="annotation">@7:</span> countdown &gt; 2</span><span class="code even" style="--layer: 4" title="bb10: ../instrument-coverage/coverage_of_if_else.rs:11:12: 18:6:
11:12-18:6: FalseEdge: falseEdge -&gt; [real: bb12, imaginary: bb11]"><span class="annotation">@10:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 4" title="bb10: ../instrument-coverage/coverage_of_if_else.rs:11:12: 18:6:
11:12-18:6: FalseEdge: falseEdge -&gt; [real: bb12, imaginary: bb11]"> </span><span class="code odd" style="--layer: 5" title="bb22: ../instrument-coverage/coverage_of_if_else.rs:12:9: 14:10:
12:9-14:10: Assign: _10 = const ()
12:9-14:10: Goto: goto -&gt; bb24"><span class="annotation">@22</span></span><span class="code even" style="--layer: 6" title="bb23: ../instrument-coverage/coverage_of_if_else.rs:12:9: 14:10:
13:13-13:26: Assign: _1 = const 0_i32
12:61-14:10: Assign: _10 = const ()
12:9-14:10: Goto: goto -&gt; bb24"><span class="annotation">@23</span></span><span class="code even" style="--layer: 7" title="bb21: ../instrument-coverage/coverage_of_if_else.rs:12:9: 14:10:
12:9-14:10: FalseEdge: falseEdge -&gt; [real: bb23, imaginary: bb22]"><span class="annotation">@21:</span> if </span><span class="code even" style="--layer: 8" title="bb14: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:60:
12:12-12:60: Assign: _11 = const false
12:12-12:60: Goto: goto -&gt; bb16"><span class="annotation">@14</span></span><span class="code even" style="--layer: 9" title="bb15: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:60:
12:46-12:60: StorageLive: StorageLive(_17)
12:46-12:55: StorageLive: StorageLive(_18)
12:46-12:55: Assign: _18 = _1
12:46-12:60: Assign: _17 = Ne(move _18, const 9_i32)
12:59-12:60: StorageDead: StorageDead(_18)
12:12-12:60: SwitchInt: switchInt(move _17) -&gt; [false: bb14, otherwise: bb13]"><span class="annotation">@15</span></span><span class="code even" style="--layer: 10" title="bb16: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:60:
12:59-12:60: StorageDead: StorageDead(_17)
12:59-12:60: StorageDead: StorageDead(_12)
12:12-12:60: FakeRead: FakeRead(ForMatchedPlace, _11)
12:9-14:10: SwitchInt: switchInt(_11) -&gt; [false: bb22, otherwise: bb21]"><span class="annotation">@16</span></span><span class="code even" style="--layer: 11" title="bb13: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:60:
12:12-12:60: Assign: _11 = const true
12:12-12:60: Goto: goto -&gt; bb16"><span class="annotation">@13</span></span><span class="code even" style="--layer: 12" title="bb20: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:60:
12:41-12:42: StorageDead: StorageDead(_15)
12:41-12:42: StorageDead: StorageDead(_13)
12:12-12:60: SwitchInt: switchInt(move _12) -&gt; [false: bb15, otherwise: bb13]"><span class="annotation">@20</span></span><span class="code even" style="--layer: 13" title="bb12: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:60:
12:9-14:10: StorageLive: StorageLive(_10)
12:12-12:60: StorageLive: StorageLive(_11)
12:12-12:42: StorageLive: StorageLive(_12)
12:12-12:25: StorageLive: StorageLive(_13)
12:12-12:21: StorageLive: StorageLive(_14)
12:12-12:21: Assign: _14 = _1
12:12-12:25: Assign: _13 = Lt(move _14, const 1_i32)
12:24-12:25: StorageDead: StorageDead(_14)
12:12-12:42: SwitchInt: switchInt(move _13) -&gt; [false: bb19, otherwise: bb17]"><span class="annotation">@12</span></span><span class="code even" style="--layer: 14" title="bb18: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:42:
12:12-12:42: Assign: _12 = const false
12:12-12:42: Goto: goto -&gt; bb20"><span class="annotation">@18</span></span><span class="code even" style="--layer: 15" title="bb19: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:42:
12:29-12:42: StorageLive: StorageLive(_15)
12:29-12:38: StorageLive: StorageLive(_16)
12:29-12:38: Assign: _16 = _1
12:29-12:42: Assign: _15 = Gt(move _16, const 5_i32)
12:41-12:42: StorageDead: StorageDead(_16)
12:12-12:42: SwitchInt: switchInt(move _15) -&gt; [false: bb18, otherwise: bb17]"><span class="annotation">@19</span></span><span class="code even" style="--layer: 16" title="bb17: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:42:
12:12-12:42: Assign: _12 = const true
12:12-12:42: Goto: goto -&gt; bb20"><span class="annotation">@17:</span> countdown &lt; 1 || countdown &gt; 5</span><span class="code even" style="--layer: 13" title="bb12: ../instrument-coverage/coverage_of_if_else.rs:12:12: 12:60:
12:9-14:10: StorageLive: StorageLive(_10)
12:12-12:60: StorageLive: StorageLive(_11)
12:12-12:42: StorageLive: StorageLive(_12)
12:12-12:25: StorageLive: StorageLive(_13)
12:12-12:21: StorageLive: StorageLive(_14)
12:12-12:21: Assign: _14 = _1
12:12-12:25: Assign: _13 = Lt(move _14, const 1_i32)
12:24-12:25: StorageDead: StorageDead(_14)
12:12-12:42: SwitchInt: switchInt(move _13) -&gt; [false: bb19, otherwise: bb17]"><span class="annotation">@12:</span> || countdown != 9</span><span class="code even" style="--layer: 7" title="bb21: ../instrument-coverage/coverage_of_if_else.rs:12:9: 14:10:
12:9-14:10: FalseEdge: falseEdge -&gt; [real: bb23, imaginary: bb22]"><span class="annotation">@21:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 7" title="bb21: ../instrument-coverage/coverage_of_if_else.rs:12:9: 14:10:
12:9-14:10: FalseEdge: falseEdge -&gt; [real: bb23, imaginary: bb22]"> countdown = 0;</span></span>
<span class="line"><span class="code even" style="--layer: 7" title="bb21: ../instrument-coverage/coverage_of_if_else.rs:12:9: 14:10:
12:9-14:10: FalseEdge: falseEdge -&gt; [real: bb23, imaginary: bb22]"> </span><span class="code odd" style="--layer: 8" title="bb24: ../instrument-coverage/coverage_of_if_else.rs:14:9: 15:23:
14:9-14:10: StorageDead: StorageDead(_11)
14:9-14:10: StorageDead: StorageDead(_10)
15:9-15:23: Assign: _19 = CheckedSub(_1, const 5_i32)
15:9-15:23: Assert: assert(!move (_19.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _1, const 5_i32) -&gt; [success: bb25, unwind: bb1]"><span class="annotation">@24:</span> }</span></span>
<span class="line"><span class="code odd" style="--layer: 8" title="bb24: ../instrument-coverage/coverage_of_if_else.rs:14:9: 15:23:
14:9-14:10: StorageDead: StorageDead(_11)
14:9-14:10: StorageDead: StorageDead(_10)
15:9-15:23: Assign: _19 = CheckedSub(_1, const 5_i32)
15:9-15:23: Assert: assert(!move (_19.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _1, const 5_i32) -&gt; [success: bb25, unwind: bb1]"> countdown -= 5</span><span class="code even" style="--layer: 4" title="bb10: ../instrument-coverage/coverage_of_if_else.rs:11:12: 18:6:
11:12-18:6: FalseEdge: falseEdge -&gt; [real: bb12, imaginary: bb11]"><span class="annotation">@10:</span> ;</span></span>
<span class="line"><span class="code even" style="--layer: 4" title="bb10: ../instrument-coverage/coverage_of_if_else.rs:11:12: 18:6:
11:12-18:6: FalseEdge: falseEdge -&gt; [real: bb12, imaginary: bb11]"> } else {</span></span>
<span class="line"><span class="code even" style="--layer: 4" title="bb10: ../instrument-coverage/coverage_of_if_else.rs:11:12: 18:6:
11:12-18:6: FalseEdge: falseEdge -&gt; [real: bb12, imaginary: bb11]"> </span><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"><span class="annotation">@27</span></span><span class="code even" style="--layer: 6" title="bb11: ../instrument-coverage/coverage_of_if_else.rs:17:9: 18:6:
17:9-17:15: Assign: _0 = const ()
18:5-18:6: StorageDead: StorageDead(_8)
18:5-18:6: StorageDead: StorageDead(_5)
18:5-18:6: StorageDead: StorageDead(_4)
17:9-17:15: Goto: goto -&gt; bb27"><span class="annotation">@11:</span> return;</span></span>
<span class="line"><span class="code even" style="--layer: 6" title="bb11: ../instrument-coverage/coverage_of_if_else.rs:17:9: 18:6:
17:9-17:15: Assign: _0 = const ()
18:5-18:6: StorageDead: StorageDead(_8)
18:5-18:6: StorageDead: StorageDead(_5)
18:5-18:6: StorageDead: StorageDead(_4)
17:9-17:15: Goto: goto -&gt; bb27"> }</span><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"><span class="annotation">@27:</span> </span></span>
<span class="line"><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"></span></span>
<span class="line"><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"> let mut countdown = 0;</span></span>
<span class="line"><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"> </span><span class="code odd" style="--layer: 6" title="bb30: ../instrument-coverage/coverage_of_if_else.rs:21:5: 23:6:
21:5-23:6: Assign: _22 = const ()
21:5-23:6: Goto: goto -&gt; bb32"><span class="annotation">@30</span></span><span class="code even" style="--layer: 7" title="bb31: ../instrument-coverage/coverage_of_if_else.rs:21:5: 23:6:
22:9-22:23: Assign: _21 = const 10_i32
21:13-23:6: Assign: _22 = const ()
21:5-23:6: Goto: goto -&gt; bb32"><span class="annotation">@31</span></span><span class="code even" style="--layer: 8" title="bb29: ../instrument-coverage/coverage_of_if_else.rs:21:5: 23:6:
21:5-23:6: FalseEdge: falseEdge -&gt; [real: bb31, imaginary: bb30]"><span class="annotation">@29:</span> if </span><span class="code even" style="--layer: 9" title="bb28: ../instrument-coverage/coverage_of_if_else.rs:21:8: 21:12:
18:5-18:6: StorageDead: StorageDead(_5)
18:5-18:6: StorageDead: StorageDead(_4)
20:9-20:22: StorageLive: StorageLive(_21)
20:25-20:26: Assign: _21 = const 0_i32
20:9-20:22: FakeRead: FakeRead(ForLet, _21)
21:5-23:6: StorageLive: StorageLive(_22)
21:8-21:12: StorageLive: StorageLive(_23)
21:8-21:12: Assign: _23 = const true
21:8-21:12: FakeRead: FakeRead(ForMatchedPlace, _23)
21:5-23:6: SwitchInt: switchInt(_23) -&gt; [false: bb30, otherwise: bb29]"><span class="annotation">@28:</span> true</span><span class="code even" style="--layer: 8" title="bb29: ../instrument-coverage/coverage_of_if_else.rs:21:5: 23:6:
21:5-23:6: FalseEdge: falseEdge -&gt; [real: bb31, imaginary: bb30]"><span class="annotation">@29:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 8" title="bb29: ../instrument-coverage/coverage_of_if_else.rs:21:5: 23:6:
21:5-23:6: FalseEdge: falseEdge -&gt; [real: bb31, imaginary: bb30]"> countdown = 10;</span></span>
<span class="line"><span class="code even" style="--layer: 8" title="bb29: ../instrument-coverage/coverage_of_if_else.rs:21:5: 23:6:
21:5-23:6: FalseEdge: falseEdge -&gt; [real: bb31, imaginary: bb30]"> }</span><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"><span class="annotation">@27:</span> </span></span>
<span class="line"><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"></span></span>
<span class="line"><span class="code even" style="--layer: 5" title="bb27: ../instrument-coverage/coverage_of_if_else.rs:17:9: 51:2:
51:1-51:2: StorageDead: StorageDead(_1)
17:9-17:15: Goto: goto -&gt; bb26"> </span><span class="code even" style="--layer: 6" title="bb33: ../instrument-coverage/coverage_of_if_else.rs:25:5: 34:6:
25:5-34:6: FalseEdge: falseEdge -&gt; [real: bb35, imaginary: bb34]"><span class="annotation">@33</span></span><span class="code even" style="--layer: 7" title="bb52: ../instrument-coverage/coverage_of_if_else.rs:25:5: 34:6:
31:9-31:23: Assign: _21 = move (_39.0: i32)
27:29-32:6: Assign: _24 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
25:5-34:6: Goto: goto -&gt; bb53"><span class="annotation">@52</span></span><span class="code even" style="--layer: 8" title="bb36: ../instrument-coverage/coverage_of_if_else.rs:25:5: 34:6:
26:9-26:23: Assign: _21 = move (_27.0: i32)
25:22-27:6: Assign: _24 = const ()
25:5-34:6: Goto: goto -&gt; bb53"><span class="annotation">@36:</span> if </span><span class="code even" style="--layer: 9" title="bb32: ../instrument-coverage/coverage_of_if_else.rs:25:8: 25:21:
23:5-23:6: StorageDead: StorageDead(_23)
23:5-23:6: StorageDead: StorageDead(_22)
25:5-34:6: StorageLive: StorageLive(_24)
25:8-25:21: StorageLive: StorageLive(_25)
25:8-25:17: StorageLive: StorageLive(_26)
25:8-25:17: Assign: _26 = _21
25:8-25:21: Assign: _25 = Gt(move _26, const 7_i32)
25:20-25:21: StorageDead: StorageDead(_26)
25:8-25:21: FakeRead: FakeRead(ForMatchedPlace, _25)
25:5-34:6: SwitchInt: switchInt(_25) -&gt; [false: bb34, otherwise: bb33]"><span class="annotation">@32:</span> countdown &gt; 7</span><span class="code even" style="--layer: 8" title="bb36: ../instrument-coverage/coverage_of_if_else.rs:25:5: 34:6:
26:9-26:23: Assign: _21 = move (_27.0: i32)
25:22-27:6: Assign: _24 = const ()
25:5-34:6: Goto: goto -&gt; bb53"><span class="annotation">@36:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 8" title="bb36: ../instrument-coverage/coverage_of_if_else.rs:25:5: 34:6:
26:9-26:23: Assign: _21 = move (_27.0: i32)
25:22-27:6: Assign: _24 = const ()
25:5-34:6: Goto: goto -&gt; bb53"> </span><span class="code odd" style="--layer: 9" title="bb35: ../instrument-coverage/coverage_of_if_else.rs:26:9: 26:23:
26:9-26:23: Assign: _27 = CheckedSub(_21, const 4_i32)
26:9-26:23: Assert: assert(!move (_27.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _21, const 4_i32) -&gt; [success: bb36, unwind: bb1]"><span class="annotation">@35:</span> countdown -= 4</span><span class="code even" style="--layer: 8" title="bb36: ../instrument-coverage/coverage_of_if_else.rs:25:5: 34:6:
26:9-26:23: Assign: _21 = move (_27.0: i32)
25:22-27:6: Assign: _24 = const ()
25:5-34:6: Goto: goto -&gt; bb53"><span class="annotation">@36:</span> ;</span></span>
<span class="line"><span class="code even" style="--layer: 8" title="bb36: ../instrument-coverage/coverage_of_if_else.rs:25:5: 34:6:
26:9-26:23: Assign: _21 = move (_27.0: i32)
25:22-27:6: Assign: _24 = const ()
25:5-34:6: Goto: goto -&gt; bb53"> } else </span><span class="code even" style="--layer: 9" title="bb37: ../instrument-coverage/coverage_of_if_else.rs:27:12: 34:6:
27:12-34:6: FalseEdge: falseEdge -&gt; [real: bb39, imaginary: bb38]"><span class="annotation">@37:</span> if </span><span class="code even" style="--layer: 10" title="bb34: ../instrument-coverage/coverage_of_if_else.rs:27:15: 27:28:
27:15-27:28: StorageLive: StorageLive(_28)
27:15-27:24: StorageLive: StorageLive(_29)
27:15-27:24: Assign: _29 = _21
27:15-27:28: Assign: _28 = Gt(move _29, const 2_i32)
27:27-27:28: StorageDead: StorageDead(_29)
27:15-27:28: FakeRead: FakeRead(ForMatchedPlace, _28)
27:12-34:6: SwitchInt: switchInt(_28) -&gt; [false: bb38, otherwise: bb37]"><span class="annotation">@34:</span> countdown &gt; 2</span><span class="code even" style="--layer: 9" title="bb37: ../instrument-coverage/coverage_of_if_else.rs:27:12: 34:6:
27:12-34:6: FalseEdge: falseEdge -&gt; [real: bb39, imaginary: bb38]"><span class="annotation">@37:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 9" title="bb37: ../instrument-coverage/coverage_of_if_else.rs:27:12: 34:6:
27:12-34:6: FalseEdge: falseEdge -&gt; [real: bb39, imaginary: bb38]"> </span><span class="code odd" style="--layer: 10" title="bb48: ../instrument-coverage/coverage_of_if_else.rs:28:9: 30:10:
28:9-30:10: FalseEdge: falseEdge -&gt; [real: bb50, imaginary: bb49]"><span class="annotation">@48</span></span><span class="code even" style="--layer: 11" title="bb50: ../instrument-coverage/coverage_of_if_else.rs:28:9: 30:10:
29:13-29:26: Assign: _21 = const 0_i32
28:61-30:10: Assign: _30 = const ()
28:9-30:10: Goto: goto -&gt; bb51"><span class="annotation">@50</span></span><span class="code even" style="--layer: 12" title="bb49: ../instrument-coverage/coverage_of_if_else.rs:28:9: 30:10:
28:9-30:10: Assign: _30 = const ()
28:9-30:10: Goto: goto -&gt; bb51"><span class="annotation">@49:</span> if </span><span class="code even" style="--layer: 13" title="bb39: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:60:
28:9-30:10: StorageLive: StorageLive(_30)
28:12-28:60: StorageLive: StorageLive(_31)
28:12-28:42: StorageLive: StorageLive(_32)
28:12-28:25: StorageLive: StorageLive(_33)
28:12-28:21: StorageLive: StorageLive(_34)
28:12-28:21: Assign: _34 = _21
28:12-28:25: Assign: _33 = Lt(move _34, const 1_i32)
28:24-28:25: StorageDead: StorageDead(_34)
28:12-28:42: SwitchInt: switchInt(move _33) -&gt; [false: bb46, otherwise: bb44]"><span class="annotation">@39</span></span><span class="code even" style="--layer: 14" title="bb47: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:60:
28:41-28:42: StorageDead: StorageDead(_35)
28:41-28:42: StorageDead: StorageDead(_33)
28:12-28:60: SwitchInt: switchInt(move _32) -&gt; [false: bb42, otherwise: bb40]"><span class="annotation">@47</span></span><span class="code even" style="--layer: 15" title="bb40: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:60:
28:12-28:60: Assign: _31 = const true
28:12-28:60: Goto: goto -&gt; bb43"><span class="annotation">@40</span></span><span class="code even" style="--layer: 16" title="bb43: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:60:
28:59-28:60: StorageDead: StorageDead(_37)
28:59-28:60: StorageDead: StorageDead(_32)
28:12-28:60: FakeRead: FakeRead(ForMatchedPlace, _31)
28:9-30:10: SwitchInt: switchInt(_31) -&gt; [false: bb49, otherwise: bb48]"><span class="annotation">@43</span></span><span class="code even" style="--layer: 17" title="bb42: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:60:
28:46-28:60: StorageLive: StorageLive(_37)
28:46-28:55: StorageLive: StorageLive(_38)
28:46-28:55: Assign: _38 = _21
28:46-28:60: Assign: _37 = Ne(move _38, const 9_i32)
28:59-28:60: StorageDead: StorageDead(_38)
28:12-28:60: SwitchInt: switchInt(move _37) -&gt; [false: bb41, otherwise: bb40]"><span class="annotation">@42</span></span><span class="code even" style="--layer: 18" title="bb41: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:60:
28:12-28:60: Assign: _31 = const false
28:12-28:60: Goto: goto -&gt; bb43"><span class="annotation">@41</span></span><span class="code even" style="--layer: 19" title="bb46: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:42:
28:29-28:42: StorageLive: StorageLive(_35)
28:29-28:38: StorageLive: StorageLive(_36)
28:29-28:38: Assign: _36 = _21
28:29-28:42: Assign: _35 = Gt(move _36, const 5_i32)
28:41-28:42: StorageDead: StorageDead(_36)
28:12-28:42: SwitchInt: switchInt(move _35) -&gt; [false: bb45, otherwise: bb44]"><span class="annotation">@46</span></span><span class="code even" style="--layer: 20" title="bb45: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:42:
28:12-28:42: Assign: _32 = const false
28:12-28:42: Goto: goto -&gt; bb47"><span class="annotation">@45</span></span><span class="code even" style="--layer: 21" title="bb44: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:42:
28:12-28:42: Assign: _32 = const true
28:12-28:42: Goto: goto -&gt; bb47"><span class="annotation">@44:</span> countdown &lt; 1 || countdown &gt; 5</span><span class="code even" style="--layer: 18" title="bb41: ../instrument-coverage/coverage_of_if_else.rs:28:12: 28:60:
28:12-28:60: Assign: _31 = const false
28:12-28:60: Goto: goto -&gt; bb43"><span class="annotation">@41:</span> || countdown != 9</span><span class="code even" style="--layer: 12" title="bb49: ../instrument-coverage/coverage_of_if_else.rs:28:9: 30:10:
28:9-30:10: Assign: _30 = const ()
28:9-30:10: Goto: goto -&gt; bb51"><span class="annotation">@49:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 12" title="bb49: ../instrument-coverage/coverage_of_if_else.rs:28:9: 30:10:
28:9-30:10: Assign: _30 = const ()
28:9-30:10: Goto: goto -&gt; bb51"> countdown = 0;</span></span>
<span class="line"><span class="code even" style="--layer: 12" title="bb49: ../instrument-coverage/coverage_of_if_else.rs:28:9: 30:10:
28:9-30:10: Assign: _30 = const ()
28:9-30:10: Goto: goto -&gt; bb51"> </span><span class="code odd" style="--layer: 13" title="bb51: ../instrument-coverage/coverage_of_if_else.rs:30:9: 31:23:
30:9-30:10: StorageDead: StorageDead(_31)
30:9-30:10: StorageDead: StorageDead(_30)
31:9-31:23: Assign: _39 = CheckedSub(_21, const 5_i32)
31:9-31:23: Assert: assert(!move (_39.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _21, const 5_i32) -&gt; [success: bb52, unwind: bb1]"><span class="annotation">@51:</span> }</span></span>
<span class="line"><span class="code odd" style="--layer: 13" title="bb51: ../instrument-coverage/coverage_of_if_else.rs:30:9: 31:23:
30:9-30:10: StorageDead: StorageDead(_31)
30:9-30:10: StorageDead: StorageDead(_30)
31:9-31:23: Assign: _39 = CheckedSub(_21, const 5_i32)
31:9-31:23: Assert: assert(!move (_39.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _21, const 5_i32) -&gt; [success: bb52, unwind: bb1]"> countdown -= 5</span><span class="code even" style="--layer: 9" title="bb37: ../instrument-coverage/coverage_of_if_else.rs:27:12: 34:6:
27:12-34:6: FalseEdge: falseEdge -&gt; [real: bb39, imaginary: bb38]"><span class="annotation">@37:</span> ;</span></span>
<span class="line"><span class="code even" style="--layer: 9" title="bb37: ../instrument-coverage/coverage_of_if_else.rs:27:12: 34:6:
27:12-34:6: FalseEdge: falseEdge -&gt; [real: bb39, imaginary: bb38]"> } else {</span></span>
<span class="line"><span class="code even" style="--layer: 9" title="bb37: ../instrument-coverage/coverage_of_if_else.rs:27:12: 34:6:
27:12-34:6: FalseEdge: falseEdge -&gt; [real: bb39, imaginary: bb38]"> </span><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"><span class="annotation">@38:</span> return;</span></span>
<span class="line"><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"> }</span></span>
<span class="line"><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"></span></span>
<span class="line"><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"> let mut countdown = 0;</span></span>
<span class="line"><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"> </span><span class="code even" style="--layer: 11" title="bb56: ../instrument-coverage/coverage_of_if_else.rs:37:5: 39:6:
38:9-38:23: Assign: _41 = const 10_i32
37:13-39:6: Assign: _42 = const ()
37:5-39:6: Goto: goto -&gt; bb57"><span class="annotation">@56</span></span><span class="code even" style="--layer: 12" title="bb54: ../instrument-coverage/coverage_of_if_else.rs:37:5: 39:6:
37:5-39:6: FalseEdge: falseEdge -&gt; [real: bb56, imaginary: bb55]"><span class="annotation">@54</span></span><span class="code even" style="--layer: 13" title="bb55: ../instrument-coverage/coverage_of_if_else.rs:37:5: 39:6:
37:5-39:6: Assign: _42 = const ()
37:5-39:6: Goto: goto -&gt; bb57"><span class="annotation">@55:</span> if </span><span class="code even" style="--layer: 14" title="bb53: ../instrument-coverage/coverage_of_if_else.rs:37:8: 37:12:
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
36:9-36:22: StorageLive: StorageLive(_41)
36:25-36:26: Assign: _41 = const 0_i32
36:9-36:22: FakeRead: FakeRead(ForLet, _41)
37:5-39:6: StorageLive: StorageLive(_42)
37:8-37:12: StorageLive: StorageLive(_43)
37:8-37:12: Assign: _43 = const true
37:8-37:12: FakeRead: FakeRead(ForMatchedPlace, _43)
37:5-39:6: SwitchInt: switchInt(_43) -&gt; [false: bb55, otherwise: bb54]"><span class="annotation">@53:</span> true</span><span class="code even" style="--layer: 13" title="bb55: ../instrument-coverage/coverage_of_if_else.rs:37:5: 39:6:
37:5-39:6: Assign: _42 = const ()
37:5-39:6: Goto: goto -&gt; bb57"><span class="annotation">@55:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 13" title="bb55: ../instrument-coverage/coverage_of_if_else.rs:37:5: 39:6:
37:5-39:6: Assign: _42 = const ()
37:5-39:6: Goto: goto -&gt; bb57"> countdown = 10;</span></span>
<span class="line"><span class="code even" style="--layer: 13" title="bb55: ../instrument-coverage/coverage_of_if_else.rs:37:5: 39:6:
37:5-39:6: Assign: _42 = const ()
37:5-39:6: Goto: goto -&gt; bb57"> }</span><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"><span class="annotation">@38:</span> </span></span>
<span class="line"><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"></span></span>
<span class="line"><span class="code even" style="--layer: 10" title="bb38: ../instrument-coverage/coverage_of_if_else.rs:33:9: 51:2:
33:9-33:15: Assign: _0 = const ()
34:5-34:6: StorageDead: StorageDead(_28)
34:5-34:6: StorageDead: StorageDead(_25)
34:5-34:6: StorageDead: StorageDead(_24)
51:1-51:2: StorageDead: StorageDead(_21)
33:9-33:15: Goto: goto -&gt; bb27"> </span><span class="code odd" style="--layer: 11" title="bb61: ../instrument-coverage/coverage_of_if_else.rs:41:5: 50:6:
42:9-42:23: Assign: _41 = move (_46.0: i32)
41:22-43:6: Assign: _0 = const ()
41:5-50:6: Goto: goto -&gt; bb78"><span class="annotation">@61</span></span><span class="code even" style="--layer: 12" title="bb58: ../instrument-coverage/coverage_of_if_else.rs:41:5: 50:6:
41:5-50:6: FalseEdge: falseEdge -&gt; [real: bb60, imaginary: bb59]"><span class="annotation">@58</span></span><span class="code even" style="--layer: 13" title="bb77: ../instrument-coverage/coverage_of_if_else.rs:41:5: 50:6:
47:9-47:23: Assign: _41 = move (_58.0: i32)
43:29-48:6: Assign: _0 = const ()
50:5-50:6: StorageDead: StorageDead(_47)
41:5-50:6: Goto: goto -&gt; bb78"><span class="annotation">@77:</span> if </span><span class="code even" style="--layer: 14" title="bb57: ../instrument-coverage/coverage_of_if_else.rs:41:8: 41:21:
39:5-39:6: StorageDead: StorageDead(_43)
39:5-39:6: StorageDead: StorageDead(_42)
41:8-41:21: StorageLive: StorageLive(_44)
41:8-41:17: StorageLive: StorageLive(_45)
41:8-41:17: Assign: _45 = _41
41:8-41:21: Assign: _44 = Gt(move _45, const 7_i32)
41:20-41:21: StorageDead: StorageDead(_45)
41:8-41:21: FakeRead: FakeRead(ForMatchedPlace, _44)
41:5-50:6: SwitchInt: switchInt(_44) -&gt; [false: bb59, otherwise: bb58]"><span class="annotation">@57:</span> countdown &gt; 7</span><span class="code even" style="--layer: 13" title="bb77: ../instrument-coverage/coverage_of_if_else.rs:41:5: 50:6:
47:9-47:23: Assign: _41 = move (_58.0: i32)
43:29-48:6: Assign: _0 = const ()
50:5-50:6: StorageDead: StorageDead(_47)
41:5-50:6: Goto: goto -&gt; bb78"><span class="annotation">@77:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 13" title="bb77: ../instrument-coverage/coverage_of_if_else.rs:41:5: 50:6:
47:9-47:23: Assign: _41 = move (_58.0: i32)
43:29-48:6: Assign: _0 = const ()
50:5-50:6: StorageDead: StorageDead(_47)
41:5-50:6: Goto: goto -&gt; bb78"> </span><span class="code odd" style="--layer: 14" title="bb60: ../instrument-coverage/coverage_of_if_else.rs:42:9: 42:23:
42:9-42:23: Assign: _46 = CheckedSub(_41, const 4_i32)
42:9-42:23: Assert: assert(!move (_46.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _41, const 4_i32) -&gt; [success: bb61, unwind: bb1]"><span class="annotation">@60:</span> countdown -= 4</span><span class="code even" style="--layer: 13" title="bb77: ../instrument-coverage/coverage_of_if_else.rs:41:5: 50:6:
47:9-47:23: Assign: _41 = move (_58.0: i32)
43:29-48:6: Assign: _0 = const ()
50:5-50:6: StorageDead: StorageDead(_47)
41:5-50:6: Goto: goto -&gt; bb78"><span class="annotation">@77:</span> ;</span></span>
<span class="line"><span class="code even" style="--layer: 13" title="bb77: ../instrument-coverage/coverage_of_if_else.rs:41:5: 50:6:
47:9-47:23: Assign: _41 = move (_58.0: i32)
43:29-48:6: Assign: _0 = const ()
50:5-50:6: StorageDead: StorageDead(_47)
41:5-50:6: Goto: goto -&gt; bb78"> } else </span><span class="code even" style="--layer: 14" title="bb62: ../instrument-coverage/coverage_of_if_else.rs:43:12: 50:6:
43:12-50:6: FalseEdge: falseEdge -&gt; [real: bb64, imaginary: bb63]"><span class="annotation">@62:</span> if </span><span class="code even" style="--layer: 15" title="bb59: ../instrument-coverage/coverage_of_if_else.rs:43:15: 43:28:
43:15-43:28: StorageLive: StorageLive(_47)
43:15-43:24: StorageLive: StorageLive(_48)
43:15-43:24: Assign: _48 = _41
43:15-43:28: Assign: _47 = Gt(move _48, const 2_i32)
43:27-43:28: StorageDead: StorageDead(_48)
43:15-43:28: FakeRead: FakeRead(ForMatchedPlace, _47)
43:12-50:6: SwitchInt: switchInt(_47) -&gt; [false: bb63, otherwise: bb62]"><span class="annotation">@59:</span> countdown &gt; 2</span><span class="code even" style="--layer: 14" title="bb62: ../instrument-coverage/coverage_of_if_else.rs:43:12: 50:6:
43:12-50:6: FalseEdge: falseEdge -&gt; [real: bb64, imaginary: bb63]"><span class="annotation">@62:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 14" title="bb62: ../instrument-coverage/coverage_of_if_else.rs:43:12: 50:6:
43:12-50:6: FalseEdge: falseEdge -&gt; [real: bb64, imaginary: bb63]"> </span><span class="code odd" style="--layer: 15" title="bb75: ../instrument-coverage/coverage_of_if_else.rs:44:9: 46:10:
45:13-45:26: Assign: _41 = const 0_i32
44:61-46:10: Assign: _49 = const ()
44:9-46:10: Goto: goto -&gt; bb76"><span class="annotation">@75</span></span><span class="code even" style="--layer: 16" title="bb74: ../instrument-coverage/coverage_of_if_else.rs:44:9: 46:10:
44:9-46:10: Assign: _49 = const ()
44:9-46:10: Goto: goto -&gt; bb76"><span class="annotation">@74</span></span><span class="code even" style="--layer: 17" title="bb73: ../instrument-coverage/coverage_of_if_else.rs:44:9: 46:10:
44:9-46:10: FalseEdge: falseEdge -&gt; [real: bb75, imaginary: bb74]"><span class="annotation">@73:</span> if </span><span class="code even" style="--layer: 18" title="bb67: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:60:
44:46-44:60: StorageLive: StorageLive(_56)
44:46-44:55: StorageLive: StorageLive(_57)
44:46-44:55: Assign: _57 = _41
44:46-44:60: Assign: _56 = Ne(move _57, const 9_i32)
44:59-44:60: StorageDead: StorageDead(_57)
44:12-44:60: SwitchInt: switchInt(move _56) -&gt; [false: bb66, otherwise: bb65]"><span class="annotation">@67</span></span><span class="code even" style="--layer: 19" title="bb68: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:60:
44:59-44:60: StorageDead: StorageDead(_56)
44:59-44:60: StorageDead: StorageDead(_51)
44:12-44:60: FakeRead: FakeRead(ForMatchedPlace, _50)
44:9-46:10: SwitchInt: switchInt(_50) -&gt; [false: bb74, otherwise: bb73]"><span class="annotation">@68</span></span><span class="code even" style="--layer: 20" title="bb65: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:60:
44:12-44:60: Assign: _50 = const true
44:12-44:60: Goto: goto -&gt; bb68"><span class="annotation">@65</span></span><span class="code even" style="--layer: 21" title="bb72: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:60:
44:41-44:42: StorageDead: StorageDead(_54)
44:41-44:42: StorageDead: StorageDead(_52)
44:12-44:60: SwitchInt: switchInt(move _51) -&gt; [false: bb67, otherwise: bb65]"><span class="annotation">@72</span></span><span class="code even" style="--layer: 22" title="bb64: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:60:
44:9-46:10: StorageLive: StorageLive(_49)
44:12-44:60: StorageLive: StorageLive(_50)
44:12-44:42: StorageLive: StorageLive(_51)
44:12-44:25: StorageLive: StorageLive(_52)
44:12-44:21: StorageLive: StorageLive(_53)
44:12-44:21: Assign: _53 = _41
44:12-44:25: Assign: _52 = Lt(move _53, const 1_i32)
44:24-44:25: StorageDead: StorageDead(_53)
44:12-44:42: SwitchInt: switchInt(move _52) -&gt; [false: bb71, otherwise: bb69]"><span class="annotation">@64</span></span><span class="code even" style="--layer: 23" title="bb66: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:60:
44:12-44:60: Assign: _50 = const false
44:12-44:60: Goto: goto -&gt; bb68"><span class="annotation">@66</span></span><span class="code even" style="--layer: 24" title="bb69: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:42:
44:12-44:42: Assign: _51 = const true
44:12-44:42: Goto: goto -&gt; bb72"><span class="annotation">@69</span></span><span class="code even" style="--layer: 25" title="bb71: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:42:
44:29-44:42: StorageLive: StorageLive(_54)
44:29-44:38: StorageLive: StorageLive(_55)
44:29-44:38: Assign: _55 = _41
44:29-44:42: Assign: _54 = Gt(move _55, const 5_i32)
44:41-44:42: StorageDead: StorageDead(_55)
44:12-44:42: SwitchInt: switchInt(move _54) -&gt; [false: bb70, otherwise: bb69]"><span class="annotation">@71</span></span><span class="code even" style="--layer: 26" title="bb70: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:42:
44:12-44:42: Assign: _51 = const false
44:12-44:42: Goto: goto -&gt; bb72"><span class="annotation">@70:</span> countdown &lt; 1 || countdown &gt; 5</span><span class="code even" style="--layer: 23" title="bb66: ../instrument-coverage/coverage_of_if_else.rs:44:12: 44:60:
44:12-44:60: Assign: _50 = const false
44:12-44:60: Goto: goto -&gt; bb68"><span class="annotation">@66:</span> || countdown != 9</span><span class="code even" style="--layer: 17" title="bb73: ../instrument-coverage/coverage_of_if_else.rs:44:9: 46:10:
44:9-46:10: FalseEdge: falseEdge -&gt; [real: bb75, imaginary: bb74]"><span class="annotation">@73:</span> {</span></span>
<span class="line"><span class="code even" style="--layer: 17" title="bb73: ../instrument-coverage/coverage_of_if_else.rs:44:9: 46:10:
44:9-46:10: FalseEdge: falseEdge -&gt; [real: bb75, imaginary: bb74]"> countdown = 0;</span></span>
<span class="line"><span class="code even" style="--layer: 17" title="bb73: ../instrument-coverage/coverage_of_if_else.rs:44:9: 46:10:
44:9-46:10: FalseEdge: falseEdge -&gt; [real: bb75, imaginary: bb74]"> </span><span class="code odd" style="--layer: 18" title="bb76: ../instrument-coverage/coverage_of_if_else.rs:46:9: 47:23:
46:9-46:10: StorageDead: StorageDead(_50)
46:9-46:10: StorageDead: StorageDead(_49)
47:9-47:23: Assign: _58 = CheckedSub(_41, const 5_i32)
47:9-47:23: Assert: assert(!move (_58.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _41, const 5_i32) -&gt; [success: bb77, unwind: bb1]"><span class="annotation">@76:</span> }</span></span>
<span class="line"><span class="code odd" style="--layer: 18" title="bb76: ../instrument-coverage/coverage_of_if_else.rs:46:9: 47:23:
46:9-46:10: StorageDead: StorageDead(_50)
46:9-46:10: StorageDead: StorageDead(_49)
47:9-47:23: Assign: _58 = CheckedSub(_41, const 5_i32)
47:9-47:23: Assert: assert(!move (_58.1: bool), &quot;attempt to compute `{} - {}` which would overflow&quot;, _41, const 5_i32) -&gt; [success: bb77, unwind: bb1]"> countdown -= 5</span><span class="code even" style="--layer: 14" title="bb62: ../instrument-coverage/coverage_of_if_else.rs:43:12: 50:6:
43:12-50:6: FalseEdge: falseEdge -&gt; [real: bb64, imaginary: bb63]"><span class="annotation">@62:</span> ;</span></span>
<span class="line"><span class="code even" style="--layer: 14" title="bb62: ../instrument-coverage/coverage_of_if_else.rs:43:12: 50:6:
43:12-50:6: FalseEdge: falseEdge -&gt; [real: bb64, imaginary: bb63]"> } else {</span></span>
<span class="line"><span class="code even" style="--layer: 14" title="bb62: ../instrument-coverage/coverage_of_if_else.rs:43:12: 50:6:
43:12-50:6: FalseEdge: falseEdge -&gt; [real: bb64, imaginary: bb63]"> </span><span class="code even" style="--layer: 15" title="bb63: ../instrument-coverage/coverage_of_if_else.rs:49:9: 51:2:
49:9-49:15: Assign: _0 = const ()
50:5-50:6: StorageDead: StorageDead(_47)
51:1-51:2: StorageDead: StorageDead(_41)
51:1-51:2: StorageDead: StorageDead(_21)
51:1-51:2: StorageDead: StorageDead(_1)
51:1-51:2: StorageDead: StorageDead(_44)
49:9-49:15: Goto: goto -&gt; bb26"><span class="annotation">@63:</span> return;</span></span>
<span class="line"><span class="code even" style="--layer: 15" title="bb63: ../instrument-coverage/coverage_of_if_else.rs:49:9: 51:2:
49:9-49:15: Assign: _0 = const ()
50:5-50:6: StorageDead: StorageDead(_47)
51:1-51:2: StorageDead: StorageDead(_41)
51:1-51:2: StorageDead: StorageDead(_21)
51:1-51:2: StorageDead: StorageDead(_1)
51:1-51:2: StorageDead: StorageDead(_44)
49:9-49:15: Goto: goto -&gt; bb26"> }</span><span class="code even" style="--layer: 16" title="bb78: ../instrument-coverage/coverage_of_if_else.rs:51:1: 51:2:
51:1-51:2: StorageDead: StorageDead(_41)
51:1-51:2: StorageDead: StorageDead(_21)
51:1-51:2: StorageDead: StorageDead(_1)
51:1-51:2: StorageDead: StorageDead(_44)
51:2-51:2: Goto: goto -&gt; bb26"><span class="annotation">@78:</span> }</span><span><span class="code even" style="--layer: 1" title="bb26: ../instrument-coverage/coverage_of_if_else.rs:51:2: 51:2:
51:2-51:2: Return: return"><span class="annotation">@26</span></span></span></span></div>
</body>
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@ -1,103 +0,0 @@
# needs-profiler-support
# ignore-msvc
# FIXME(richkadel): Debug the following problem, and reenable on Windows (by
# removing the `# ignore-msvc` directive above). The current implementation
# generates a segfault when running the instrumented `testprog` executable,
# after the `main()` function completes, but before the process terminates.
# This most likely points to a problem generating the LLVM "testprog.profraw"
# file.
-include ../tools.mk
UNAME = $(shell uname)
ifeq ($(UNAME),Darwin)
INSTR_PROF_DATA_SUFFIX=,regular,live_support
DATA_SECTION_PREFIX=__DATA,
LLVM_COV_SECTION_PREFIX=__LLVM_COV,
else
INSTR_PROF_DATA_SUFFIX=
DATA_SECTION_PREFIX=
LLVM_COV_SECTION_PREFIX=
endif
# This test makes sure that LLVM coverage maps are genereated in LLVM IR.
COMMON_FLAGS=-Zinstrument-coverage
all:
# Compile the test program with instrumentation, and also generate LLVM IR
$(RUSTC) $(COMMON_FLAGS) testprog.rs \
--emit=link,llvm-ir
# check the LLVM IR
ifdef IS_WIN32
cat "$(TMPDIR)"/testprog.ll | "$(LLVM_FILECHECK)" filecheck-patterns.txt \
-check-prefixes=CHECK,WIN32 \
-DPRIVATE_GLOBAL="internal global" \
-DINSTR_PROF_DATA=".lprfd$$M" \
-DINSTR_PROF_NAME=".lprfn$$M" \
-DINSTR_PROF_CNTS=".lprfc$$M" \
-DINSTR_PROF_VALS=".lprfv$$M" \
-DINSTR_PROF_VNODES=".lprfnd$$M" \
-DINSTR_PROF_COVMAP=".lcovmap$$M" \
-DINSTR_PROF_ORDERFILE=".lorderfile$$M"
else
cat "$(TMPDIR)"/testprog.ll | "$(LLVM_FILECHECK)" filecheck-patterns.txt \
-check-prefixes=CHECK \
-DPRIVATE_GLOBAL="private global" \
-DINSTR_PROF_DATA="$(DATA_SECTION_PREFIX)__llvm_prf_data$(INSTR_PROF_DATA_SUFFIX)" \
-DINSTR_PROF_NAME="$(DATA_SECTION_PREFIX)__llvm_prf_names" \
-DINSTR_PROF_CNTS="$(DATA_SECTION_PREFIX)__llvm_prf_cnts" \
-DINSTR_PROF_VALS="$(DATA_SECTION_PREFIX)__llvm_prf_vals" \
-DINSTR_PROF_VNODES="$(DATA_SECTION_PREFIX)__llvm_prf_vnds" \
-DINSTR_PROF_COVMAP="$(LLVM_COV_SECTION_PREFIX)__llvm_covmap" \
-DINSTR_PROF_ORDERFILE="$(DATA_SECTION_PREFIX)__llvm_orderfile"
endif
# Run it in order to generate some profiling data,
# with `LLVM_PROFILE_FILE=<profdata_file>` environment variable set to
# output the coverage stats for this run.
LLVM_PROFILE_FILE="$(TMPDIR)"/testprog.profraw \
$(call RUN,testprog)
# Postprocess the profiling data so it can be used by the llvm-cov tool
"$(LLVM_BIN_DIR)"/llvm-profdata merge --sparse \
"$(TMPDIR)"/testprog.profraw \
-o "$(TMPDIR)"/testprog.profdata
# Generate a coverage report using `llvm-cov show`. The output ordering
# can be non-deterministic, so ignore the return status. If the test fails
# when comparing the JSON `export`, the `show` output may be useful when
# debugging.
"$(LLVM_BIN_DIR)"/llvm-cov show \
--Xdemangler="$(RUST_DEMANGLER)" \
--show-line-counts-or-regions \
--instr-profile="$(TMPDIR)"/testprog.profdata \
$(call BIN,"$(TMPDIR)"/testprog) \
> "$(TMPDIR)"/actual_show_coverage.txt
ifdef RUSTC_BLESS_TEST
cp "$(TMPDIR)"/actual_show_coverage.txt typical_show_coverage.txt
else
# Compare the show coverage output
$(DIFF) typical_show_coverage.txt "$(TMPDIR)"/actual_show_coverage.txt || \
>&2 echo 'diff failed for `llvm-cov show` (might not be an error)'
endif
# Generate a coverage report in JSON, using `llvm-cov export`, and fail if
# there are differences from the expected output.
"$(LLVM_BIN_DIR)"/llvm-cov export \
--summary-only \
--instr-profile="$(TMPDIR)"/testprog.profdata \
$(call BIN,"$(TMPDIR)"/testprog) \
| "$(PYTHON)" prettify_json.py \
> "$(TMPDIR)"/actual_export_coverage.json
ifdef RUSTC_BLESS_TEST
cp "$(TMPDIR)"/actual_export_coverage.json expected_export_coverage.json
else
# Check that the exported JSON coverage data matches what we expect
$(DIFF) expected_export_coverage.json "$(TMPDIR)"/actual_export_coverage.json
endif

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@ -0,0 +1,3 @@
# Directory "instrument-coverage" supports the tests at prefix ../instrument-coverage-*
# Use ./x.py [options] test src/test/run-make-fulldeps/instrument-coverage to run all related tests.

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@ -0,0 +1,51 @@
#![allow(unused_assignments)]
fn main() {
let mut countdown = 0;
if true {
countdown = 10;
}
if countdown > 7 {
countdown -= 4;
} else if countdown > 2 {
if countdown < 1 || countdown > 5 || countdown != 9 {
countdown = 0;
}
countdown -= 5;
} else {
return;
}
let mut countdown = 0;
if true {
countdown = 10;
}
if countdown > 7 {
countdown -= 4;
} else if countdown > 2 {
if countdown < 1 || countdown > 5 || countdown != 9 {
countdown = 0;
}
countdown -= 5;
} else {
return;
}
let mut countdown = 0;
if true {
countdown = 10;
}
if countdown > 7 {
countdown -= 4;
} else if countdown > 2 {
if countdown < 1 || countdown > 5 || countdown != 9 {
countdown = 0;
}
countdown -= 5;
} else {
return;
}
}

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@ -0,0 +1,39 @@
# Common Makefile include for Rust `run-make-fulldeps/instrument-coverage-* tests. Include this
# file with the line:
#
# -include ../instrument-coverage/coverage_tools.mk
#
# To enable the Rust compiler option `-C link-dead-code`, also set the following variable
# *BEFORE* the `-include` line:
#
# LINK_DEAD_CODE=yes
-include ../tools.mk
ifndef LINK_DEAD_CODE
LINK_DEAD_CODE=no
endif
# ISSUE(76038): When targeting MSVC, Rust binaries built with both `-Z instrument-coverage` and
# `-C link-dead-code` typically crash (with a seg-fault) or at best generate an empty `*.profraw`
# file, required for coverage reports.
#
# Enabling `-C link-dead-code` is preferred when compiling with `-Z instrument-coverage`, so
# `-C link-dead-code` is automatically enabled for all platform targets _except_ MSVC.
#
# Making the state of `-C link-dead-code` platform-dependent creates a problem for cross-platform
# tests because the injected counters, coverage reports, and some low-level output can be different,
# depending on the `-C link-dead-code` setting. For example, coverage reports will not report any
# coverage for a dead code region when the `-C link-dead-code` option is disabled, but with the
# option enabled, those same regions will show coverage counter values (of zero, of course).
#
# To ensure cross-platform `-Z instrument-coverage` generate consistent output, the
# `-C link-dead-code` option is always explicitly enabled or disabled.
#
# Since tests that execute binaries enabled with both `-Z instrument-coverage` and
# `-C link-dead-code` are known to fail, those tests will need the `# ignore-msvc` setting.
#
# If and when the above issue is resolved, the `# ignore-msvc` option can be removed, and the
# tests can be simplified to always test with `-C link-dead-code`.
UNAME = $(shell uname)

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@ -1,59 +0,0 @@
{
"data": [
{
"files": [
{
"filename": "testprog.rs",
"summary": {
"functions": {
"count": 7,
"covered": 5,
"percent": 71.42857142857143
},
"instantiations": {
"count": 8,
"covered": 6,
"percent": 75
},
"lines": {
"count": 30,
"covered": 25,
"percent": 83.33333333333334
},
"regions": {
"count": 7,
"covered": 5,
"notcovered": 2,
"percent": 71.42857142857143
}
}
}
],
"totals": {
"functions": {
"count": 7,
"covered": 5,
"percent": 71.42857142857143
},
"instantiations": {
"count": 8,
"covered": 6,
"percent": 75
},
"lines": {
"count": 30,
"covered": 25,
"percent": 83.33333333333334
},
"regions": {
"count": 7,
"covered": 5,
"notcovered": 2,
"percent": 71.42857142857143
}
}
}
],
"type": "llvm.coverage.json.export",
"version": "2.0.1"
}

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@ -1,51 +0,0 @@
# Check for metadata, variables, declarations, and function definitions injected
# into LLVM IR when compiling with -Zinstrument-coverage.
WIN32: $__llvm_profile_runtime_user = comdat any
CHECK: @__llvm_coverage_mapping = internal constant
CHECK-SAME: section "[[INSTR_PROF_COVMAP]]", align 8
WIN32: @__llvm_profile_runtime = external global i32
CHECK: @__profc__R{{[a-zA-Z0-9_]+}}testprog14will_be_called = [[PRIVATE_GLOBAL]]
CHECK-SAME: section "[[INSTR_PROF_CNTS]]", align 8
CHECK: @__profd__R{{[a-zA-Z0-9_]+}}testprog14will_be_called = [[PRIVATE_GLOBAL]]
CHECK-SAME: @__profc__R{{[a-zA-Z0-9_]+}}testprog14will_be_called,
CHECK-SAME: ()* @_R{{[a-zA-Z0-9_]+}}testprog14will_be_called to i8*),
CHECK-SAME: section "[[INSTR_PROF_DATA]]", align 8
CHECK: @__profc__R{{[a-zA-Z0-9_]+}}testprog4main = [[PRIVATE_GLOBAL]]
CHECK-SAME: section "[[INSTR_PROF_CNTS]]", align 8
CHECK: @__profd__R{{[a-zA-Z0-9_]+}}testprog4main = [[PRIVATE_GLOBAL]]
CHECK-SAME: @__profc__R{{[a-zA-Z0-9_]+}}testprog4main,
CHECK-SAME: ()* @_R{{[a-zA-Z0-9_]+}}testprog4main to i8*),
CHECK-SAME: section "[[INSTR_PROF_DATA]]", align 8
CHECK: @__llvm_prf_nm = private constant
CHECK-SAME: section "[[INSTR_PROF_NAME]]", align 1
CHECK: @llvm.used = appending global
CHECK-SAME: i8* bitcast ({ {{.*}} }* @__llvm_coverage_mapping to i8*)
WIN32-SAME: i8* bitcast (i32 ()* @__llvm_profile_runtime_user to i8*)
CHECK-SAME: i8* bitcast ({ {{.*}} }* @__profd__R{{[a-zA-Z0-9_]*}}testprog4main to i8*)
CHECK-SAME: i8* getelementptr inbounds ({{.*}}* @__llvm_prf_nm, i32 0, i32 0)
CHECK-SAME: section "llvm.metadata"
CHECK: define hidden { {{.*}} } @_R{{[a-zA-Z0-9_]+}}testprog14will_be_called() unnamed_addr #{{[0-9]+}} {
CHECK-NEXT: start:
CHECK-NOT: bb{{[0-9]+}}:
CHECK: %pgocount = load i64, i64* getelementptr inbounds
CHECK-SAME: * @__profc__R{{[a-zA-Z0-9_]+}}testprog14will_be_called,
CHECK: declare void @llvm.instrprof.increment(i8*, i64, i32, i32) #[[LLVM_INSTRPROF_INCREMENT_ATTR:[0-9]+]]
WIN32: define linkonce_odr hidden i32 @__llvm_profile_runtime_user() #[[LLVM_PROFILE_RUNTIME_USER_ATTR:[0-9]+]] comdat {
WIN32-NEXT: %1 = load i32, i32* @__llvm_profile_runtime
WIN32-NEXT: ret i32 %1
WIN32-NEXT: }
CHECK: attributes #[[LLVM_INSTRPROF_INCREMENT_ATTR]] = { nounwind }
WIN32: attributes #[[LLVM_PROFILE_RUNTIME_USER_ATTR]] = { noinline }

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@ -1,55 +0,0 @@
1| 2|pub fn will_be_called() -> &'static str {
2| 2| let val = "called";
3| 2| println!("{}", val);
4| 2| val
5| 2|}
6| |
7| 0|pub fn will_not_be_called() -> bool {
8| 0| println!("should not have been called");
9| 0| false
10| 0|}
11| |
12| |pub fn print<T>(left: &str, value: T, right: &str)
13| |where
14| | T: std::fmt::Display,
15| 1|{
16| 1| println!("{}{}{}", left, value, right);
17| 1|}
18| |
19| |pub fn wrap_with<F, T>(inner: T, should_wrap: bool, wrapper: F)
20| |where
21| | F: FnOnce(&T)
22| 2|{
23| 2| if should_wrap {
24| 2| wrapper(&inner)
25| 2| }
26| 2|}
------------------
| testprog[317d481089b8c8fe]::wrap_with::<testprog[317d481089b8c8fe]::main::{closure#0}, &str>:
| 22| 1|{
| 23| 1| if should_wrap {
| 24| 1| wrapper(&inner)
| 25| 1| }
| 26| 1|}
------------------
| testprog[317d481089b8c8fe]::wrap_with::<testprog[317d481089b8c8fe]::main::{closure#1}, &str>:
| 22| 1|{
| 23| 1| if should_wrap {
| 24| 1| wrapper(&inner)
| 25| 1| }
| 26| 1|}
------------------
27| |
28| 1|fn main() {
29| 1| let less = 1;
30| 1| let more = 100;
31| 1|
32| 1| if less < more {
33| 1| wrap_with(will_be_called(), less < more, |inner| print(" ***", inner, "*** "));
34| 1| wrap_with(will_be_called(), more < less, |inner| print(" ***", inner, "*** "));
^0
35| 1| } else {
36| 1| wrap_with(will_not_be_called(), true, |inner| print("wrapped result is: ", inner, ""));
37| 1| }
38| 1|}