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rollup merge of #19520: csouth3/derefmut-unsized

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Right now, `DerefMut` is not `for Sized?`, so you can't impl `DerefMut<T> for Foo` where `Foo` is unsized.  However, there is no reason that it can't be `for Sized?`, so this pull request fixes the issue.

Closes #19493.
This commit is contained in:
Corey Richardson
2014-12-05 10:07:47 -08:00
parent d58aecb6b3 cddbb6a75b
commit c7d545e2f7
1 changed files with 1 additions and 1 deletions
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src/libcore/ops.rs
+1 -1
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@@ -787,7 +787,7 @@ fn deref(&self) -> &T { *self }
/// }
/// ```
#[lang="deref_mut"]
pub trait DerefMut<Sized? Result>: Deref<Result> {
pub trait DerefMut<Sized? Result> for Sized? : Deref<Result> {
/// The method called to mutably dereference a value
fn deref_mut<'a>(&'a mut self) -> &'a mut Result;
}