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comments and factor to own method

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This commit is contained in:
Gus Wynn 2020-09-16 12:32:10 -07:00
parent 1d93048324
commit 230355f25f
2 changed files with 38 additions and 36 deletions
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70
compiler/rustc_typeck/src/check/pat.rs
View File

@ -1,5 +1,6 @@
use crate::check::FnCtxt;
use rustc_ast as ast;
use rustc_ast::util::lev_distance::find_best_match_for_name;
use rustc_data_structures::fx::FxHashMap;
use rustc_errors::{pluralize, struct_span_err, Applicability, DiagnosticBuilder};
@ -740,6 +741,40 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
pat_ty
}
fn maybe_suggest_range_literal(
&self,
e: &mut DiagnosticBuilder<'_>,
opt_def_id: Option<hir::def_id::DefId>,
ident: Ident,
) -> bool {
match opt_def_id {
Some(def_id) => match self.tcx.hir().get_if_local(def_id) {
Some(hir::Node::Item(hir::Item {
kind: hir::ItemKind::Const(_, body_id), ..
})) => match self.tcx.hir().get(body_id.hir_id) {
hir::Node::Expr(expr) => {
if hir::is_range_literal(expr) {
let span = self.tcx.hir().span(body_id.hir_id);
if let Ok(snip) = self.tcx.sess.source_map().span_to_snippet(span) {
e.span_suggestion_verbose(
ident.span,
"you may want to move the range into the match block",
snip,
Applicability::MachineApplicable,
);
return true;
}
}
}
_ => (),
},
_ => (),
},
_ => (),
}
false
}
fn emit_bad_pat_path(
&self,
mut e: DiagnosticBuilder<'_>,
@ -789,40 +824,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
self.tcx.lang_items().range_to_inclusive_struct(),
];
if type_def_id != None && ranges.contains(&type_def_id) {
let generic_message = match item_def_id {
Some(def_id) => match self.tcx.hir().get_if_local(def_id) {
Some(hir::Node::Item(hir::Item {
kind: hir::ItemKind::Const(_, body_id),
..
})) => match self.tcx.hir().get(body_id.hir_id) {
hir::Node::Expr(expr) => {
if hir::is_range_literal(expr) {
let span = self.tcx.hir().span(body_id.hir_id);
if let Ok(snip) =
self.tcx.sess.source_map().span_to_snippet(span)
{
e.span_suggestion_verbose(
span,
"you may want to move the range into the match block",
snip,
Applicability::MachineApplicable
);
false
} else {
true
}
} else {
true
}
}
_ => true,
},
_ => true,
},
_ => true,
};
if generic_message {
if !self.maybe_suggest_range_literal(&mut e, item_def_id, *ident) {
let msg = "constants only support matching by type, \
if you meant to match against a range of values, \
consider using a range pattern like `min ..= max` in the match block";

4
src/test/ui/issues/issue-76191.stderr
View File

@ -16,8 +16,8 @@ LL | RANGE => {}
found struct `RangeInclusive<i32>`
help: you may want to move the range into the match block
|
LL | const RANGE: RangeInclusive<i32> = 0..=255;
| ^^^^^^^
LL | 0..=255 => {}
| ^^^^^^^
error[E0308]: mismatched types
--> $DIR/issue-76191.rs:15:9