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pattern lowering: make sure we never call user-defined PartialEq instances

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This commit is contained in:
Ralf Jung 2024-07-13 18:03:05 +02:00
parent e613bc92a1
commit 86ce911f90
3 changed files with 35 additions and 39 deletions
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11
compiler/rustc_middle/src/thir.rs
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@ -783,16 +783,13 @@ pub enum PatKind<'tcx> {
},
/// One of the following:
/// * `&str` (represented as a valtree), which will be handled as a string pattern and thus
/// exhaustiveness checking will detect if you use the same string twice in different
/// patterns.
/// * `&str`/`&[u8]` (represented as a valtree), which will be handled as a string/slice pattern
/// and thus exhaustiveness checking will detect if you use the same string/slice twice in
/// different patterns.
/// * integer, bool, char or float (represented as a valtree), which will be handled by
/// exhaustiveness to cover exactly its own value, similar to `&str`, but these values are
/// much simpler.
/// * Opaque constants (represented as `mir::ConstValue`), that must not be matched
/// structurally. So anything that does not derive `PartialEq` and `Eq`.
///
/// These are always compared with the matched place using (the semantics of) `PartialEq`.
/// * `String`, if `string_deref_patterns` is enabled.
Constant {
value: mir::Const<'tcx>,
},