commit b87d70f08c45306c5d2f28f11731a924e007c47f
author David Tolnay <dtolnay@gmail.com> Sun Aug 30 20:02:06 2020 -0700
committer David Tolnay <dtolnay@gmail.com> Sun Aug 30 20:02:13 2020 -0700
tree 78e7c9a1882514f13dc961f93e212d11e80fb79e
parent b1ea3107e4c2e94fd39486576f5b4ad02b064df2

Fix duplication of error messages

Before:

    ```
    cxxbridge: No such file or directory (os error 2)

    Caused by:
        No such file or directory (os error 2)
    ```

gen/src/error.rs

diff --git a/gen/src/error.rs b/gen/src/error.rs
index 1cedab1..d8badac 100644
--- a/gen/src/error.rs
+++ b/gen/src/error.rs
@@ -33,8 +33,8 @@
 impl StdError for Error {
     fn source(&self) -> Option<&(dyn StdError + 'static)> {
         match self {
-            Error::Io(err) => Some(err),
-            Error::Syn(err) => Some(err),
+            Error::Io(err) => err.source(),
+            Error::Syn(err) => err.source(),
             _ => None,
         }
     }