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Add a comment explaining the return type of Ty::kind.

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This commit is contained in:
Nicholas Nethercote 2024-08-15 09:46:21 +10:00
parent 13a52890dd
commit 99aad72af5
1 changed files with 4 additions and 0 deletions
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compiler/rustc_middle/src/ty/sty.rs
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@ -970,6 +970,10 @@ impl<'tcx> rustc_type_ir::inherent::Ty<TyCtxt<'tcx>> for Ty<'tcx> {
/// Type utilities /// Type utilities
impl<'tcx> Ty<'tcx> { impl<'tcx> Ty<'tcx> {
// It would be nicer if this returned the value instead of a reference,
// like how `Predicate::kind` and `Region::kind` do. (It would result in
// many fewer subsequent dereferences.) But that gives a small but
// noticeable performance hit. See #126069 for details.
#[inline(always)] #[inline(always)]
pub fn kind(self) -> &'tcx TyKind<'tcx> { pub fn kind(self) -> &'tcx TyKind<'tcx> {
self.0.0 self.0.0