goprotobuf: Fix parsing of repeated enum fields.

R=r
CC=golang-dev
http://codereview.appspot.com/5239052
diff --git a/proto/text_parser_test.go b/proto/text_parser_test.go
index 4e3f4e9..2383828 100644
--- a/proto/text_parser_test.go
+++ b/proto/text_parser_test.go
@@ -252,9 +252,8 @@
 			if err != nil {
 				t.Errorf("Test %d: Unexpected error: %v", i, err)
 			} else if !reflect.DeepEqual(pb, test.out) {
-				t.Errorf("Test %d: Incorrect populated \n"+
-					"Have: %v\nWant: %v",
-					i, CompactTextString(pb), CompactTextString(test.out))
+				t.Errorf("Test %d: Incorrect populated \nHave: %v\nWant: %v",
+					i, pb, test.out)
 			}
 		} else {
 			// We do expect failure.
@@ -268,6 +267,20 @@
 	}
 }
 
+// Regression test; this caused a panic.
+func TestRepeatedEnum(t *testing.T) {
+	pb := new(RepeatedEnum)
+	if err := UnmarshalText("color: RED", pb); err != nil {
+		t.Fatal(err)
+	}
+	exp := &RepeatedEnum{
+		Color: []RepeatedEnum_Color{RepeatedEnum_RED},
+	}
+	if !reflect.DeepEqual(pb, exp) {
+		t.Errorf("Incorrect populated \nHave: %v\nWant: %v", pb, exp)
+	}
+}
+
 var benchInput string
 
 func init() {