client/flagpb: fix repeated bool without value

client/flagpb/unmarshal_test.go

 // Copyright 2016 The Chromium 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 flagpb
 
 import (
         "io/ioutil"
         "testing"
 
@@ skipping 76 matching lines @@
                 })
                 Convey("bool", func() {
                         Convey("without value", func() {
                                 So(unmarshalOK("M1", "-b"), ShouldResemble, msg("b", true))
 
                                 So(unmarshalOK("M1", "-b", "-s", "x"), ShouldResemble, msg(
                                         "b", true,
                                         "s", "x",
                                 ))
                         })
+                        Convey("without value, repeated", func() {
+                                So(unmarshalOK("M1", "-rb=false", "-rb"), ShouldResemble, msg("rb", repeated(false, true)))
+                        })
                         Convey("with value", func() {
                                 So(unmarshalOK("M1", "-b=true"), ShouldResemble, msg("b", true))
                                 So(unmarshalOK("M1", "-b=false"), ShouldResemble, msg("b", false))
                         })
                 })
                 Convey("bytes", func() {
                         Convey("next arg", func() {
                                 So(unmarshalOK("M1", "-bb", "6869"), ShouldResemble, msg("bb", []byte("hi")))
                         })
                         Convey("equals sign", func() {
@@ skipping 76 matching lines @@
                                 })
                                 Convey("reports meaningful error", func() {
                                         err := unmarshalErr("M3", "-m1.s", "x", "-m1.s", "y")
                                         So(err, ShouldErrLike, `-m1.s: value is already set`)
                                         So(err, ShouldErrLike, `insert -m1`)
                                 })
                         })
                 })
         })
 }