1 files changed, 2 insertions, 1 deletions
diff --git a/src/libsyntax/parse/mod.rs b/src/libsyntax/parse/mod.rs
index 4f1d41a4a7a..0c024958a24 100644
--- a/src/libsyntax/parse/mod.rs
+++ b/src/libsyntax/parse/mod.rs
@@ -420,7 +420,8 @@ mod test {
 
     #[cfg(test)] fn to_json_str<E : Encodable<std::json::Encoder>>(val: @E) -> ~str {
         do io::with_str_writer |writer| {
-            val.encode(~std::json::Encoder(writer));
+            let mut encoder = std::json::Encoder(writer);
+            val.encode(&mut encoder);
         }
     }