From 0b098ba55c3cd6e0790a517f0259dd444a067b00 Mon Sep 17 00:00:00 2001
From: "C. Morgan Hamill" <me@cmhamill.org>
Date: Fri, 20 Mar 2015 09:21:14 -0400
Subject: Add `cause()` method to `Error` type.

Returns the underlying error type, if any.
---
 src/error.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/error.rs b/src/error.rs
index 57d636a..b26a21d 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -26,6 +26,13 @@ impl error::Error for Error {
             Error::NotmuchError(ref e) => e.description(),
         }
     }
+
+    fn cause(&self) -> Option<&error::Error> {
+        match *self {
+            Error::IoError(ref e) => Some(e),
+            Error::NotmuchError(ref e) => Some(e),
+        }
+    }
 }
 
 impl error::FromError<io::Error> for Error {
-- 
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