1// compile -c=2
2
3// Copyright 2017 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7// Issue 20174: failure to typecheck contents of *T in the frontend.
8
9package p
10
11func f() {
12	_ = (*interface{})(nil) // interface{} here used to not have its width calculated going into backend
13	select {
14	case _ = <-make(chan interface {
15		M()
16	}, 1):
17	}
18}
19