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permit negative impls for non-auto traits

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This commit is contained in:
Niko Matsakis 2020-01-08 06:39:38 -05:00
parent a17dd36084
commit e8a05e201e
35 changed files with 328 additions and 101 deletions
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4
src/libcore/ops/deref.rs
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@ -81,6 +81,10 @@ impl<T: ?Sized> Deref for &T {
}
}
#[cfg(not(bootstrap))]
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: ?Sized> !DerefMut for &T {}
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: ?Sized> Deref for &mut T {
type Target = T;