1// errorcheck
2
3// Copyright 2018 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
7package main
8
9type Stringer interface {
10	String() string
11}
12
13func main() {
14	var e interface{}
15	switch e := e.(type) {
16	case G: // ERROR "undefined: G|undefined type .*G"
17		e.M() // ok: this error should be ignored because the case failed its typecheck
18	case E: // ERROR "undefined: E|undefined type .*E"
19		e.D() // ok: this error should be ignored because the case failed its typecheck
20	case Stringer:
21		// ok: this error should not be ignored to prove that passing legs aren't left out
22		_ = e.(T) // ERROR "undefined: T|undefined type .*T"
23	}
24}
25