commit 5c58c53d5ca7a4b2696c1834d0f668e8b07a3782
author David Tolnay <dtolnay@gmail.com> Mon Aug 13 11:33:51 2018 -0700
committer David Tolnay <dtolnay@gmail.com> Tue Aug 14 10:26:43 2018 -0700
tree d3c4063de6f572e9066bbdbba58e39667f675efa
parent 60b48bd560f89fd8f0aa499803109126f30c079e

impl Extend<TokenStream> for TokenStream

This impl mirrors the second Extend impl in libproc_macro.

src/stable.rs

diff --git a/src/stable.rs b/src/stable.rs
index 0efc32c..30b8e77 100644
--- a/src/stable.rs
+++ b/src/stable.rs
@@ -160,6 +160,13 @@
     }
 }
 
+impl Extend<TokenStream> for TokenStream {
+    fn extend<I: IntoIterator<Item = TokenStream>>(&mut self, streams: I) {
+        self.inner
+            .extend(streams.into_iter().flat_map(|stream| stream));
+    }
+}
+
 pub type TokenTreeIter = vec::IntoIter<TokenTree>;
 
 impl IntoIterator for TokenStream {