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Add a comment about TypeFoldable and slices.

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Nicholas Nethercote 2023-04-27 16:21:20 +10:00
parent a82ad2fed4
commit 4b85aa99ad
1 changed files with 4 additions and 0 deletions
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compiler/rustc_type_ir/src/structural_impls.rs
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@ -141,6 +141,10 @@ fn visit_with<V: TypeVisitor<I>>(&self, visitor: &mut V) -> ControlFlow<V::Break
} }
} }
// `TypeFoldable` isn't impl'd for `&[T]`. It doesn't make sense in the general
// case, because we can't return a new slice. But note that there are a couple
// of trivial impls of `TypeFoldable` for specific slice types elsewhere.
impl<I: Interner, T: TypeVisitable<I>> TypeVisitable<I> for &[T] { impl<I: Interner, T: TypeVisitable<I>> TypeVisitable<I> for &[T] {
fn visit_with<V: TypeVisitor<I>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> { fn visit_with<V: TypeVisitor<I>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.iter().try_for_each(|t| t.visit_with(visitor)) self.iter().try_for_each(|t| t.visit_with(visitor))