gc: improve error message for composite literals with unexpected newlines

R=golang-dev, r, rsc
CC=golang-dev
https://golang.org/cl/5857045

1 files changed, 11 insertions, 0 deletions

diff --git a/test/syntax/composite.go b/test/syntax/composite.go
new file mode 100644
index 0000000000..6565334935
--- /dev/null
+++ b/test/syntax/composite.go
@@ -0,0 +1,11 @@
+// errorcheck
+
+// Copyright 2012 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+var a = []int{
+	3 // ERROR "need trailing comma before newline in composite literal"
+}