Rollup merge of #80553 - derekdreery:arc_error, r=m-ou-se

Add an impl of Error on `Arc<impl Error>`. `Display` already exists so this should be a non-controversial change (famous last words). Would have to be insta-stable.
rust-lang · Feb 25, 2021 · 351d947 · 351d947
2 parents cb2b4ff 0d6640a
commit 351d947
Showing 1 changed file with 22 additions and 0 deletions.
diff --git a/library/std/src/error.rs b/library/std/src/error.rs
@@ -30,6  30,7 @@ use crate::mem::transmute;
 use crate::num;
 use crate::str;
 use crate::string;
 use crate::sync::Arc;
 
 /// `Error` is a trait representing the basic expectations for error values,
 /// i.e., values of type `E` in [`Result<T, E>`]. Errors must describe
@@ -507,6  508,27 @@ impl<'a, T: Error   ?Sized> Error for &'a T {
     }
 }
 
 #[stable(feature = "arc_error", since = "1.52.0")]
 impl<T: Error   ?Sized> Error for Arc<T> {
     #[allow(deprecated, deprecated_in_future)]
     fn description(&self) -> &str {
         Error::description(&**self)
     }
 
     #[allow(deprecated)]
     fn cause(&self) -> Option<&dyn Error> {
         Error::cause(&**self)
     }
 
     fn source(&self) -> Option<&(dyn Error   'static)> {
         Error::source(&**self)
     }
 
     fn backtrace(&self) -> Option<&Backtrace> {
         Error::backtrace(&**self)
     }
 }
 
 #[stable(feature = "fmt_error", since = "1.11.0")]
 impl Error for fmt::Error {
     #[allow(deprecated)]