feat(error): implement Error::source when available

Closes #1768
2019-02-27 13:18:02 -08:00
parent 0bf30ccc68
commit 4cf22dfa21
3 changed files with 22 additions and 0 deletions
--- a/src/error.rs
+++ b/src/error.rs
@@ -323,6 +323,7 @@ impl StdError for Error {
        }
    }

+    #[cfg(not(error_source))]
    fn cause(&self) -> Option<&StdError> {
        self
            .inner
@@ -330,6 +331,15 @@ impl StdError for Error {
            .as_ref()
            .map(|cause| &**cause as &StdError)
    }
+
+    #[cfg(error_source)]
+    fn source(&self) -> Option<&(StdError + 'static)> {
+        self
+            .inner
+            .cause
+            .as_ref()
+            .map(|cause| &**cause as &(StdError + 'static))
+    }
 }

 #[doc(hidden)]