bjoernager/rust
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Point at const definition when used instead of a binding in a let statement

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After:

```
error[E0005]: refutable pattern in local binding
  --> $DIR/bad-pattern.rs:19:13
   |
LL |     const PAT: u32 = 0;
   |     -------------- missing patterns are not covered because `PAT` is interpreted as a constant pattern, not a new variable
...
LL |         let PAT = v1;
   |             ^^^
   |             |
   |             pattern `1_u32..=u32::MAX` not covered
   |             help: introduce a variable instead: `PAT_var`
   |
   = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
   = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
   = note: the matched value is of type `u32`
```

Before:

```
error[E0005]: refutable pattern in local binding
  --> $DIR/bad-pattern.rs:19:13
   |
LL |         let PAT = v1;
   |             ^^^
   |             |
   |             pattern `1_u32..=u32::MAX` not covered
   |             missing patterns are not covered because `PAT` is interpreted as a constant pattern, not a new variable
   |             help: introduce a variable instead: `PAT_var`
   |
   = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
   = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
   = note: the matched value is of type `u32`
```
This commit is contained in:
Esteban Küber 2024-11-06 19:46:54 +00:00
parent 917a50a039
commit ff2f7a7a83
18 changed files with 78 additions and 28 deletions
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5
compiler/rustc_mir_build/src/errors.rs
View file

@ -860,8 +860,10 @@ pub(crate) struct PatternNotCovered<'s, 'tcx> {
pub(crate) uncovered: Uncovered,
#[subdiagnostic]
pub(crate) inform: Option<Inform>,
#[label(mir_build_confused)]
pub(crate) interpreted_as_const: Option<Span>,
#[subdiagnostic]
pub(crate) interpreted_as_const: Option<InterpretedAsConst>,
pub(crate) interpreted_as_const_sugg: Option<InterpretedAsConst>,
#[subdiagnostic]
pub(crate) adt_defined_here: Option<AdtDefinedHere<'tcx>>,
#[note(mir_build_privately_uninhabited)]
@ -913,7 +915,6 @@ impl<'tcx> Subdiagnostic for AdtDefinedHere<'tcx> {
code = "{variable}_var",
applicability = "maybe-incorrect"
)]
#[label(mir_build_confused)]
pub(crate) struct InterpretedAsConst {
#[primary_span]
pub(crate) span: Span,