Rollup merge of #61900 - s3bk:master, r=sfackler

Centril · web-flow · commit d3898a673157 · 2019-06-20T22:14:24.000+02:00
implement Error::source for Box<T: Error> fixes #61899
diff --git a/src/libstd/error.rs b/src/libstd/error.rs
@@ -560,6 +560,10 @@ impl<T: Error> Error for Box<T> {
     fn cause(&self) -> Option<&dyn Error> {
         Error::cause(&**self)
     }
+
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        Error::source(&**self)
+    }
 }
 
 #[stable(feature = "fmt_error", since = "1.11.0")]

Original file line number	Diff line number	Diff line change
`@@ -560,6 +560,10 @@ impl<T: Error> Error for Box<T> {`
`560`	`560`	`fn cause(&self) -> Option<&dyn Error> {`
`561`	`561`	`Error::cause(&**self)`
`562`	`562`	`}`
	`563`	`+`
	`564`	`+ fn source(&self) -> Option<&(dyn Error + 'static)> {`
	`565`	`+ Error::source(&**self)`
	`566`	`+ }`
`563`	`567`	`}`
`564`	`568`
`565`	`569`	`#[stable(feature = "fmt_error", since = "1.11.0")]`