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Check if call return type is visibly uninhabited when building MIR

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This commit is contained in:
Tomasz Miąsko 2022-01-25 00:00:00 +00:00
parent 4b133a7e27
commit 6f8a1ee45e
19 changed files with 167 additions and 98 deletions
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13
compiler/rustc_mir_build/src/build/expr/into.rs
View File

@ -255,10 +255,15 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
func: fun,
args,
cleanup: None,
// FIXME(varkor): replace this with an uninhabitedness-based check.
// This requires getting access to the current module to call
// `tcx.is_ty_uninhabited_from`, which is currently tricky to do.
destination: if expr.ty.is_never() {
// The presence or absence of a return edge affects control-flow sensitive
// MIR checks and ultimately whether code is accepted or not. We can only
// omit the return edge if a return type is visibly uninhabited to a module
// that makes the call.
destination: if this.tcx.is_ty_uninhabited_from(
this.parent_module,
expr.ty,
this.param_env,
) {
None
} else {
Some((destination, success))

5
compiler/rustc_mir_build/src/build/mod.rs
View File

@ -350,6 +350,7 @@ struct Builder<'a, 'tcx> {
def_id: DefId,
hir_id: hir::HirId,
parent_module: DefId,
check_overflow: bool,
fn_span: Span,
arg_count: usize,
@ -807,15 +808,17 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
);
let lint_level = LintLevel::Explicit(hir_id);
let param_env = tcx.param_env(def.did);
let mut builder = Builder {
thir,
tcx,
infcx,
typeck_results: tcx.typeck_opt_const_arg(def),
region_scope_tree: tcx.region_scope_tree(def.did),
param_env: tcx.param_env(def.did),
param_env,
def_id: def.did.to_def_id(),
hir_id,
parent_module: tcx.parent_module(hir_id).to_def_id(),
check_overflow,
cfg: CFG { basic_blocks: IndexVec::new() },
fn_span: span,

2
src/test/codegen/set-discriminant-invalid.rs
View File

@ -28,7 +28,7 @@ impl IntoError<Error> for Api
#[no_mangle]
fn into_error(self, error: Self::Source) -> Error {
Error::Api {
source: (|v| v)(error),
source: error,
}
}
}

49
src/test/mir-opt/inline/inline_diverging.h.Inline.diff
View File

@ -4,21 +4,22 @@
fn h() -> () {
let mut _0: (); // return place in scope 0 at $DIR/inline-diverging.rs:21:12: 21:12
let _1: (!, !); // in scope 0 at $DIR/inline-diverging.rs:22:5: 22:22
+ let mut _2: fn() -> ! {sleep}; // in scope 0 at $DIR/inline-diverging.rs:22:5: 22:22
+ let mut _9: (); // in scope 0 at $DIR/inline-diverging.rs:27:13: 27:16
+ let mut _10: (); // in scope 0 at $DIR/inline-diverging.rs:28:13: 28:16
+ let mut _2: (!, !); // in scope 0 at $DIR/inline-diverging.rs:22:5: 22:22
+ let mut _3: fn() -> ! {sleep}; // in scope 0 at $DIR/inline-diverging.rs:22:5: 22:22
+ let mut _10: (); // in scope 0 at $DIR/inline-diverging.rs:27:13: 27:16
+ let mut _11: (); // in scope 0 at $DIR/inline-diverging.rs:28:13: 28:16
+ scope 1 (inlined call_twice::<!, fn() -> ! {sleep}>) { // at $DIR/inline-diverging.rs:22:5: 22:22
+ debug f => _2; // in scope 1 at $DIR/inline-diverging.rs:26:36: 26:37
+ let _3: !; // in scope 1 at $DIR/inline-diverging.rs:27:9: 27:10
+ let mut _4: &fn() -> ! {sleep}; // in scope 1 at $DIR/inline-diverging.rs:27:13: 27:14
+ let mut _6: &fn() -> ! {sleep}; // in scope 1 at $DIR/inline-diverging.rs:28:13: 28:14
+ let mut _7: !; // in scope 1 at $DIR/inline-diverging.rs:29:6: 29:7
+ let mut _8: !; // in scope 1 at $DIR/inline-diverging.rs:29:9: 29:10
+ debug f => _3; // in scope 1 at $DIR/inline-diverging.rs:26:36: 26:37
+ let _4: !; // in scope 1 at $DIR/inline-diverging.rs:27:9: 27:10
+ let mut _5: &fn() -> ! {sleep}; // in scope 1 at $DIR/inline-diverging.rs:27:13: 27:14
+ let mut _7: &fn() -> ! {sleep}; // in scope 1 at $DIR/inline-diverging.rs:28:13: 28:14
+ let mut _8: !; // in scope 1 at $DIR/inline-diverging.rs:29:6: 29:7
+ let mut _9: !; // in scope 1 at $DIR/inline-diverging.rs:29:9: 29:10
+ scope 2 {
+ debug a => _3; // in scope 2 at $DIR/inline-diverging.rs:27:9: 27:10
+ let _5: !; // in scope 2 at $DIR/inline-diverging.rs:28:9: 28:10
+ debug a => _4; // in scope 2 at $DIR/inline-diverging.rs:27:9: 27:10
+ let _6: !; // in scope 2 at $DIR/inline-diverging.rs:28:9: 28:10
+ scope 3 {
+ debug b => _5; // in scope 3 at $DIR/inline-diverging.rs:28:9: 28:10
+ debug b => _6; // in scope 3 at $DIR/inline-diverging.rs:28:9: 28:10
+ }
+ scope 6 (inlined <fn() -> ! {sleep} as Fn<()>>::call - shim(fn() -> ! {sleep})) { // at $DIR/inline-diverging.rs:28:13: 28:16
+ scope 7 (inlined sleep) { // at $SRC_DIR/core/src/ops/function.rs:LL:COL
@ -33,27 +34,25 @@
bb0: {
StorageLive(_1); // scope 0 at $DIR/inline-diverging.rs:22:5: 22:22
- _1 = call_twice::<!, fn() -> ! {sleep}>(sleep) -> bb1; // scope 0 at $DIR/inline-diverging.rs:22:5: 22:22
- call_twice::<!, fn() -> ! {sleep}>(sleep); // scope 0 at $DIR/inline-diverging.rs:22:5: 22:22
+ StorageLive(_2); // scope 0 at $DIR/inline-diverging.rs:22:5: 22:22
+ _2 = sleep; // scope 0 at $DIR/inline-diverging.rs:22:5: 22:22
+ StorageLive(_3); // scope 0 at $DIR/inline-diverging.rs:22:5: 22:22
+ _3 = sleep; // scope 0 at $DIR/inline-diverging.rs:22:5: 22:22
// mir::Constant
- // + span: $DIR/inline-diverging.rs:22:5: 22:15
- // + literal: Const { ty: fn(fn() -> ! {sleep}) -> (!, !) {call_twice::<!, fn() -> ! {sleep}>}, val: Value(Scalar(<ZST>)) }
- // mir::Constant
// + span: $DIR/inline-diverging.rs:22:16: 22:21
// + literal: Const { ty: fn() -> ! {sleep}, val: Value(Scalar(<ZST>)) }
+ StorageLive(_3); // scope 1 at $DIR/inline-diverging.rs:27:9: 27:10
+ StorageLive(_4); // scope 1 at $DIR/inline-diverging.rs:27:13: 27:14
+ _4 = &_2; // scope 1 at $DIR/inline-diverging.rs:27:13: 27:14
+ StorageLive(_9); // scope 1 at $DIR/inline-diverging.rs:27:13: 27:16
+ _9 = const (); // scope 1 at $DIR/inline-diverging.rs:27:13: 27:16
+ StorageLive(_4); // scope 1 at $DIR/inline-diverging.rs:27:9: 27:10
+ StorageLive(_5); // scope 1 at $DIR/inline-diverging.rs:27:13: 27:14
+ _5 = &_3; // scope 1 at $DIR/inline-diverging.rs:27:13: 27:14
+ StorageLive(_10); // scope 1 at $DIR/inline-diverging.rs:27:13: 27:16
+ _10 = const (); // scope 1 at $DIR/inline-diverging.rs:27:13: 27:16
+ goto -> bb1; // scope 5 at $DIR/inline-diverging.rs:39:5: 39:12
}
bb1: {
- StorageDead(_1); // scope 0 at $DIR/inline-diverging.rs:22:22: 22:23
- _0 = const (); // scope 0 at $DIR/inline-diverging.rs:21:12: 23:2
- return; // scope 0 at $DIR/inline-diverging.rs:23:2: 23:2
+ }
+
+ bb1: {
+ goto -> bb1; // scope 5 at $DIR/inline-diverging.rs:39:5: 39:12
}
}

2
src/test/mir-opt/issue_72181_1.main.mir_map.0.mir
View File

@ -21,7 +21,7 @@ fn main() -> () {
StorageLive(_2); // scope 0 at $DIR/issue-72181-1.rs:16:9: 16:10
StorageLive(_3); // scope 2 at $DIR/issue-72181-1.rs:17:41: 17:43
_3 = (); // scope 2 at $DIR/issue-72181-1.rs:17:41: 17:43
_2 = transmute::<(), Void>(move _3) -> [return: bb1, unwind: bb4]; // scope 2 at $DIR/issue-72181-1.rs:17:9: 17:44
transmute::<(), Void>(move _3) -> bb4; // scope 2 at $DIR/issue-72181-1.rs:17:9: 17:44
// mir::Constant
// + span: $DIR/issue-72181-1.rs:17:9: 17:40
// + literal: Const { ty: unsafe extern "rust-intrinsic" fn(()) -> Void {transmute::<(), Void>}, val: Value(Scalar(<ZST>)) }

22
src/test/ui/consts/const-eval/ub-enum.32bit.stderr
View File

@ -119,27 +119,17 @@ LL | const BAD_OPTION_CHAR: Option<(char, char)> = Some(('x', unsafe { mem::tran
78 00 00 00 ff ff ff ff │ x.......
}
error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-enum.rs:92:1
error[E0080]: evaluation of constant value failed
--> $DIR/ub-enum.rs:92:77
|
LL | const BAD_UNINHABITED_WITH_DATA1: Result<(i32, Never), (i32, !)> = unsafe { mem::transmute(0u64) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<enum-variant(Ok)>.0.1: encountered a value of uninhabited type Never
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
= note: the raw bytes of the constant (size: 8, align: 4) {
00 00 00 00 00 00 00 00 │ ........
}
| ^^^^^^^^^^^^^^^^^^^^ transmuting to uninhabited type
error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-enum.rs:94:1
error[E0080]: evaluation of constant value failed
--> $DIR/ub-enum.rs:94:77
|
LL | const BAD_UNINHABITED_WITH_DATA2: Result<(i32, !), (i32, Never)> = unsafe { mem::transmute(0u64) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<enum-variant(Ok)>.0.1: encountered a value of the never type `!`
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
= note: the raw bytes of the constant (size: 8, align: 4) {
00 00 00 00 00 00 00 00 │ ........
}
| ^^^^^^^^^^^^^^^^^^^^ transmuting to uninhabited type
error: aborting due to 13 previous errors

22
src/test/ui/consts/const-eval/ub-enum.64bit.stderr
View File

@ -119,27 +119,17 @@ LL | const BAD_OPTION_CHAR: Option<(char, char)> = Some(('x', unsafe { mem::tran
78 00 00 00 ff ff ff ff │ x.......
}
error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-enum.rs:92:1
error[E0080]: evaluation of constant value failed
--> $DIR/ub-enum.rs:92:77
|
LL | const BAD_UNINHABITED_WITH_DATA1: Result<(i32, Never), (i32, !)> = unsafe { mem::transmute(0u64) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<enum-variant(Ok)>.0.1: encountered a value of uninhabited type Never
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
= note: the raw bytes of the constant (size: 8, align: 4) {
00 00 00 00 00 00 00 00 │ ........
}
| ^^^^^^^^^^^^^^^^^^^^ transmuting to uninhabited type
error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-enum.rs:94:1
error[E0080]: evaluation of constant value failed
--> $DIR/ub-enum.rs:94:77
|
LL | const BAD_UNINHABITED_WITH_DATA2: Result<(i32, !), (i32, Never)> = unsafe { mem::transmute(0u64) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at .<enum-variant(Ok)>.0.1: encountered a value of the never type `!`
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
= note: the raw bytes of the constant (size: 8, align: 4) {
00 00 00 00 00 00 00 00 │ ........
}
| ^^^^^^^^^^^^^^^^^^^^ transmuting to uninhabited type
error: aborting due to 13 previous errors

4
src/test/ui/consts/const-eval/ub-enum.rs
View File

@ -90,9 +90,9 @@ const BAD_OPTION_CHAR: Option<(char, char)> = Some(('x', unsafe { mem::transmute
// All variants are uninhabited but also have data.
// Use `0` as constant to make behavior endianess-independent.
const BAD_UNINHABITED_WITH_DATA1: Result<(i32, Never), (i32, !)> = unsafe { mem::transmute(0u64) };
//~^ ERROR is undefined behavior
//~^ ERROR evaluation of constant value failed
const BAD_UNINHABITED_WITH_DATA2: Result<(i32, !), (i32, Never)> = unsafe { mem::transmute(0u64) };
//~^ ERROR is undefined behavior
//~^ ERROR evaluation of constant value failed
fn main() {
}

9
src/test/ui/consts/const-eval/validate_uninhabited_zsts.32bit.stderr
View File

@ -10,14 +10,11 @@ LL | unsafe { std::mem::transmute(()) }
LL | const FOO: [Empty; 3] = [foo(); 3];
| ----- inside `FOO` at $DIR/validate_uninhabited_zsts.rs:13:26
error[E0080]: it is undefined behavior to use this value
--> $DIR/validate_uninhabited_zsts.rs:16:1
error[E0080]: evaluation of constant value failed
--> $DIR/validate_uninhabited_zsts.rs:16:35
|
LL | const BAR: [Empty; 3] = [unsafe { std::mem::transmute(()) }; 3];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at [0]: encountered a value of uninhabited type Empty
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
= note: the raw bytes of the constant (size: 0, align: 1) {}
| ^^^^^^^^^^^^^^^^^^^^^^^ transmuting to uninhabited type
warning: the type `!` does not permit zero-initialization
--> $DIR/validate_uninhabited_zsts.rs:4:14

9
src/test/ui/consts/const-eval/validate_uninhabited_zsts.64bit.stderr
View File

@ -10,14 +10,11 @@ LL | unsafe { std::mem::transmute(()) }
LL | const FOO: [Empty; 3] = [foo(); 3];
| ----- inside `FOO` at $DIR/validate_uninhabited_zsts.rs:13:26
error[E0080]: it is undefined behavior to use this value
--> $DIR/validate_uninhabited_zsts.rs:16:1
error[E0080]: evaluation of constant value failed
--> $DIR/validate_uninhabited_zsts.rs:16:35
|
LL | const BAR: [Empty; 3] = [unsafe { std::mem::transmute(()) }; 3];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed at [0]: encountered a value of uninhabited type Empty
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
= note: the raw bytes of the constant (size: 0, align: 1) {}
| ^^^^^^^^^^^^^^^^^^^^^^^ transmuting to uninhabited type
warning: the type `!` does not permit zero-initialization
--> $DIR/validate_uninhabited_zsts.rs:4:14

2
src/test/ui/consts/const-eval/validate_uninhabited_zsts.rs
View File

@ -14,7 +14,7 @@ const FOO: [Empty; 3] = [foo(); 3];
#[warn(const_err)]
const BAR: [Empty; 3] = [unsafe { std::mem::transmute(()) }; 3];
//~^ ERROR it is undefined behavior to use this value
//~^ ERROR evaluation of constant value failed
//~| WARN the type `Empty` does not permit zero-initialization
fn main() {

3
src/test/ui/generator/issue-93161.rs
View File

@ -1,5 +1,6 @@
// edition:2021
// run-pass
// compile-flags: -Zdrop-tracking
#![feature(never_type)]
@ -32,7 +33,7 @@ fn never() -> Never {
}
async fn includes_never(crash: bool, x: u32) -> u32 {
let mut result = async { x * x }.await;
let result = async { x * x }.await;
if !crash {
return result;
}

4
src/test/ui/statics/uninhabited-static.rs
View File

@ -11,11 +11,11 @@ extern {
static VOID2: Void = unsafe { std::mem::transmute(()) }; //~ ERROR static of uninhabited type
//~| WARN: previously accepted
//~| ERROR undefined behavior to use this value
//~| ERROR could not evaluate static initializer
//~| WARN: type `Void` does not permit zero-initialization
static NEVER2: Void = unsafe { std::mem::transmute(()) }; //~ ERROR static of uninhabited type
//~| WARN: previously accepted
//~| ERROR undefined behavior to use this value
//~| ERROR could not evaluate static initializer
//~| WARN: type `Void` does not permit zero-initialization
fn main() {}

18
src/test/ui/statics/uninhabited-static.stderr
View File

@ -43,23 +43,17 @@ LL | static NEVER2: Void = unsafe { std::mem::transmute(()) };
= note: for more information, see issue #74840 <https://github.com/rust-lang/rust/issues/74840>
= note: uninhabited statics cannot be initialized, and any access would be an immediate error
error[E0080]: it is undefined behavior to use this value
--> $DIR/uninhabited-static.rs:12:1
error[E0080]: could not evaluate static initializer
--> $DIR/uninhabited-static.rs:12:31
|
LL | static VOID2: Void = unsafe { std::mem::transmute(()) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a value of uninhabited type Void
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
= note: the raw bytes of the constant (size: 0, align: 1) {}
| ^^^^^^^^^^^^^^^^^^^^^^^ transmuting to uninhabited type
error[E0080]: it is undefined behavior to use this value
--> $DIR/uninhabited-static.rs:16:1
error[E0080]: could not evaluate static initializer
--> $DIR/uninhabited-static.rs:16:32
|
LL | static NEVER2: Void = unsafe { std::mem::transmute(()) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a value of uninhabited type Void
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
= note: the raw bytes of the constant (size: 0, align: 1) {}
| ^^^^^^^^^^^^^^^^^^^^^^^ transmuting to uninhabited type
warning: the type `Void` does not permit zero-initialization
--> $DIR/uninhabited-static.rs:12:31

29
src/test/ui/uninhabited/privately-uninhabited-mir-call.rs Normal file
View File

@ -0,0 +1,29 @@
// Verifies that MIR building for a call expression respects
// privacy when checking if a call return type is uninhabited.
pub mod widget {
enum Unimplemented {}
pub struct Widget(Unimplemented);
impl Widget {
pub fn new() -> Widget {
todo!();
}
}
pub fn f() {
let x: &mut u32;
Widget::new();
// Ok. Widget type returned from new is known to be uninhabited
// and the following code is considered unreachable.
*x = 1;
}
}
fn main() {
let y: &mut u32;
widget::Widget::new();
// Error. Widget type is not known to be uninhabited here,
// so the following code is considered reachable.
*y = 2; //~ ERROR use of possibly-uninitialized variable
}

9
src/test/ui/uninhabited/privately-uninhabited-mir-call.stderr Normal file
View File

@ -0,0 +1,9 @@
error[E0381]: use of possibly-uninitialized variable: `y`
--> $DIR/privately-uninhabited-mir-call.rs:28:5
|
LL | *y = 2;
| ^^^^^^ use of possibly-uninitialized `y`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0381`.

20
src/test/ui/unsafe/issue-45087-unreachable-unsafe.mir.stderr
View File

@ -1,11 +1,27 @@
error[E0133]: dereference of raw pointer is unsafe and requires unsafe function or block
--> $DIR/issue-45087-unreachable-unsafe.rs:6:5
--> $DIR/issue-45087-unreachable-unsafe.rs:7:5
|
LL | *(1 as *mut u32) = 42;
| ^^^^^^^^^^^^^^^^^^^^^ dereference of raw pointer
|
= note: raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
error: aborting due to previous error
error[E0133]: dereference of raw pointer is unsafe and requires unsafe function or block
--> $DIR/issue-45087-unreachable-unsafe.rs:17:5
|
LL | *a = 1;
| ^^^^^^ dereference of raw pointer
|
= note: raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
error[E0133]: dereference of raw pointer is unsafe and requires unsafe function or block
--> $DIR/issue-45087-unreachable-unsafe.rs:29:5
|
LL | *b = 1;
| ^^^^^^ dereference of raw pointer
|
= note: raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
error: aborting due to 3 previous errors
For more information about this error, try `rustc --explain E0133`.

23
src/test/ui/unsafe/issue-45087-unreachable-unsafe.rs
View File

@ -1,3 +1,4 @@
// Verify that unreachable code undergoes unsafety checks.
// revisions: mir thir
// [thir]compile-flags: -Z thir-unsafeck
@ -6,3 +7,25 @@ fn main() {
*(1 as *mut u32) = 42;
//~^ ERROR dereference of raw pointer is unsafe
}
fn panic() -> ! {
panic!();
}
fn f(a: *mut u32) {
panic();
*a = 1;
//~^ ERROR dereference of raw pointer is unsafe
}
enum Void {}
fn uninhabited() -> Void {
panic!();
}
fn g(b: *mut u32) {
uninhabited();
*b = 1;
//~^ ERROR dereference of raw pointer is unsafe
}

20
src/test/ui/unsafe/issue-45087-unreachable-unsafe.thir.stderr
View File

@ -1,11 +1,27 @@
error[E0133]: dereference of raw pointer is unsafe and requires unsafe function or block
--> $DIR/issue-45087-unreachable-unsafe.rs:6:5
--> $DIR/issue-45087-unreachable-unsafe.rs:7:5
|
LL | *(1 as *mut u32) = 42;
| ^^^^^^^^^^^^^^^^ dereference of raw pointer
|
= note: raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
error: aborting due to previous error
error[E0133]: dereference of raw pointer is unsafe and requires unsafe function or block
--> $DIR/issue-45087-unreachable-unsafe.rs:17:5
|
LL | *a = 1;
| ^^ dereference of raw pointer
|
= note: raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
error[E0133]: dereference of raw pointer is unsafe and requires unsafe function or block
--> $DIR/issue-45087-unreachable-unsafe.rs:29:5
|
LL | *b = 1;
| ^^ dereference of raw pointer
|
= note: raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
error: aborting due to 3 previous errors
For more information about this error, try `rustc --explain E0133`.