gc: inlining bug

R=lvd
CC=golang-dev
https://golang.org/cl/5533078

src/cmd/gc/fmt.c

@@ -669,8 +669,10 @@ typefmt(Fmt *fp, Type *t)
 		case 0:
 			break;
 		case 1:
+			if(fmtmode != FExp) {
 				fmtprint(fp, " %T", getoutargx(t)->type->type);	 // struct->field->field's type
 				break;
+			}
 		default:
 			fmtprint(fp, " %T", getoutargx(t));
 			break;

test/fixedbugs/bug392.dir/one.go

@@ -14,6 +14,9 @@ func F1(T *T) bool { return T == nil }
 // Issue 2682.
 func F2(c chan int) bool { return c == (<-chan int)(nil) }
 
+// Use of single named return value.
+func F3() (ret []int) { return append(ret, 1) }
+
 // Call of inlined method with blank receiver.
 func (_ *T) M() int { return 1 }
 func (t *T) MM() int { return t.M() }

test/fixedbugs/bug392.dir/two.go

@@ -12,9 +12,9 @@ import "./one"
 func use() {
 	one.F1(nil)
 	one.F2(nil)
+	one.F3()
 
 	var t *one.T
 	t.M()
 	t.MM()
 }
-