Delegate io::Error::cause to inner error

sfackler · sfackler · commit 4458b5a9d5f1 · 2015-05-27T21:53:54.000-07:00
diff --git a/src/libstd/io/error.rs b/src/libstd/io/error.rs
@@ -215,6 +215,13 @@ impl error::Error for Error {
             Repr::Custom(ref c) => c.error.description(),
         }
     }
+
+    fn cause(&self) -> Option<&Error> {
+        match self.repr {
+            Repr::Os(..) => None,
+            Repr::Custom(ref c) => c.error.cause(),
+        }
+    }
 }
 
 fn _assert_error_is_sync_send() {

Original file line number	Diff line number	Diff line change
`@@ -215,6 +215,13 @@ impl error::Error for Error {`
`215`	`215`	`Repr::Custom(ref c) => c.error.description(),`
`216`	`216`	`}`
`217`	`217`	`}`
	`218`	`+`
	`219`	`+ fn cause(&self) -> Option<&Error> {`
	`220`	`+ match self.repr {`
	`221`	`+ Repr::Os(..) => None,`
	`222`	`+ Repr::Custom(ref c) => c.error.cause(),`
	`223`	`+ }`
	`224`	`+ }`
`218`	`225`	`}`
`219`	`226`
`220`	`227`	`fn _assert_error_is_sync_send() {`