From 96072d6efc110e81ab6e0a70e2bf9a96a53268b6 Mon Sep 17 00:00:00 2001
From: Ben Gamari <bgamari.foss@gmail.com>
Date: Wed, 16 Jul 2014 22:24:42 -0400
Subject: [PATCH] syntax: Generalize ToTokens impl for Vec<T>

It will now `flat_map` over the elements of a `Vec<T>` if
`T: ToTokens`
---
 src/libsyntax/ext/quote.rs | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/libsyntax/ext/quote.rs b/src/libsyntax/ext/quote.rs
index eb1f25143cfce..21c5626d16d3f 100644
--- a/src/libsyntax/ext/quote.rs
+++ b/src/libsyntax/ext/quote.rs
@@ -54,9 +54,10 @@ pub mod rt {
         }
     }
 
-    impl ToTokens for Vec<TokenTree> {
-        fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
-            (*self).clone()
+    impl<T: ToTokens> ToTokens for Vec<T> {
+        fn to_tokens(&self, cx: &ExtCtxt) -> Vec<TokenTree> {
+            let a = self.iter().flat_map(|t| t.to_tokens(cx).move_iter());
+            FromIterator::from_iter(a)
         }
     }