1// Copyright 2016 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package a
6
7// F is an exported function, small enough to be inlined.
8// It defines a local interface with an unexported method
9// f, which will appear with a package-qualified method
10// name in the export data.
11func F(x interface{}) bool {
12	_, ok := x.(interface {
13		f()
14	})
15	return ok
16}
17
18// Like F but with the unexported interface method f
19// defined via an embedded interface t. The compiler
20// always flattens embedded interfaces so there should
21// be no difference between F and G. Alas, currently
22// G is not inlineable (at least via export data), so
23// the issue is moot, here.
24func G(x interface{}) bool {
25	type t0 interface {
26		f()
27	}
28	_, ok := x.(interface {
29		t0
30	})
31	return ok
32}
33
34// Like G but now the embedded interface is declared
35// at package level. This function is inlineable via
36// export data. The export data representation is like
37// for F.
38func H(x interface{}) bool {
39	_, ok := x.(interface {
40		t1
41	})
42	return ok
43}
44
45type t1 interface {
46	f()
47}
48