replace more vector + (issue #2719)

1 files changed, 9 insertions, 8 deletions

diff --git a/src/libsyntax/ext/auto_serialize.rs b/src/libsyntax/ext/auto_serialize.rs
index 06fb6b94f6e..b89be203e16 100644
--- a/src/libsyntax/ext/auto_serialize.rs
+++ b/src/libsyntax/ext/auto_serialize.rs
@@ -740,14 +740,15 @@ fn mk_deser_fn(cx: ext_ctxt, span: span,
             []/~))]/~;
 
     let deser_tps: [ast::ty_param]/~ =
-        [{ident: @"__D",
-          id: cx.next_id(),
-          bounds: deser_bnds}]/~ + vec::map(tps) {|tp|
-        let cloned = cx.clone_ty_param(tp);
-        {bounds: @(vec::append(*cloned.bounds,
-                               [ast::bound_copy]/~))
-         with cloned}
-    };
+        vec::append([{ident: @"__D",
+                      id: cx.next_id(),
+                      bounds: deser_bnds}]/~,
+                    vec::map(tps) {|tp|
+                        let cloned = cx.clone_ty_param(tp);
+                        {bounds: @(vec::append(*cloned.bounds,
+                                               [ast::bound_copy]/~))
+                         with cloned}
+                    });
 
     let deser_blk = cx.expr_blk(f(cx, tps_map, #ast(expr){__d}));