// build // Copyright 2017 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. // Linking this with gccgo got an undefined symbol reference, // because the private method in testing.TB led gccgo to assume that // the interface method table would be defined in the testing package. package main import "testing" type I interface { testing.TB Parallel() } func F(i I) { i.Log("F") } var t testing.T func main() { F(&t) }