diff options
Diffstat (limited to 'src/liballoc')
| -rw-r--r-- | src/liballoc/boxed.rs | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/src/liballoc/boxed.rs b/src/liballoc/boxed.rs index 451237d7596..50935e6404d 100644 --- a/src/liballoc/boxed.rs +++ b/src/liballoc/boxed.rs @@ -241,7 +241,7 @@ pub trait BoxAny { /// Returns the boxed value if it is of type `T`, or /// `Err(Self)` if it isn't. #[stable(feature = "rust1", since = "1.0.0")] - fn downcast<T: 'static>(self) -> Result<Box<T>, Self>; + fn downcast<T: 'static>(self) -> Result<Box<T>, Box<Any>>; } #[stable(feature = "rust1", since = "1.0.0")] @@ -264,6 +264,15 @@ impl BoxAny for Box<Any> { } } +#[cfg(not(stage0))] +#[stable(feature = "rust1", since = "1.0.0")] +impl BoxAny for Box<Any+Send> { + #[inline] + fn downcast<T: 'static>(self) -> Result<Box<T>, Box<Any>> { + <Box<Any>>::downcast(self) + } +} + #[stable(feature = "rust1", since = "1.0.0")] impl<T: fmt::Display + ?Sized> fmt::Display for Box<T> { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |