which is trailing commas in literals. They were gofmted away at some point.
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/
5673103
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
+// Test trailing commas. DO NOT gofmt THIS FILE.
+
package main
-var a = []int{1, 2}
-var b = [5]int{1, 2, 3}
-var c = []int{1}
-var d = [...]int{1, 2, 3}
+var a = []int{1, 2, }
+var b = [5]int{1, 2, 3, }
+var c = []int{1, }
+var d = [...]int{1, 2, 3, }
func main() {
if len(a) != 2 {