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Auto merge of #44174 - jimmycuadra:try-from-infallible, r=sfackler

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Add blanket TryFrom impl when From is implemented.

Adds `impl<T, U> TryFrom<T> for U where U: From<T>`.

Removes `impl<'a, T> TryFrom<&'a str> for T where T: FromStr` (originally added in #40281) due to overlapping impls caused by the new blanket impl. This removal is to be discussed further on the tracking issue for TryFrom.

Refs #33417.

/cc @sfackler, @scottmcm (thank you for the help!), and @aturon
This commit is contained in:
bors 2017-09-29 22:35:23 +00:00
commit b7041bfab3
7 changed files with 71 additions and 48 deletions
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8
src/libstd/error.rs
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@ -56,6 +56,7 @@ use any::TypeId;
use borrow::Cow;
use cell;
use char;
use convert;
use fmt::{self, Debug, Display};
use mem::transmute;
use num;
@ -362,6 +363,13 @@ impl Error for char::ParseCharError {
}
}
#[unstable(feature = "try_from", issue = "33417")]
impl Error for convert::Infallible {
fn description(&self) -> &str {
match *self {
}
}
}
// copied from any.rs
impl Error + 'static {