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thir::pattern: update some comments and error type names

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This commit is contained in:
Ralf Jung
2023-09-16 09:09:25 +02:00
parent 635c4a5e61
commit d34e15e740
2 changed files with 24 additions and 17 deletions
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16
compiler/rustc_middle/src/thir.rs
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@@ -732,12 +732,16 @@ pub enum PatKind<'tcx> {
},
/// One of the following:
/// * `&str`, which will be handled as a string pattern and thus exhaustiveness
/// checking will detect if you use the same string twice in different patterns.
/// * integer, bool, char or float, which will be handled by exhaustiveness to cover exactly
/// its own value, similar to `&str`, but these values are much simpler.
/// * Opaque constants, that must not be matched structurally. So anything that does not derive
/// `PartialEq` and `Eq`.
/// * `&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.
/// * 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`.
Constant {
value: mir::ConstantKind<'tcx>,
},