go_agent/src/code.google.com/p/go.tools/go/types/testdata/cycles4.src
// Copyright 2013 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.
package p
// Check that all methods of T are collected before
// determining the result type of m (which embeds
// all methods of T).
type T interface {
m() interface {T}
E
}
var _ = T.m(nil).m().e()
type E interface {
e() int
}
// Check that unresolved forward chains are followed
// (see also comment in resolver.go, checker.typeDecl).
var _ = C.m(nil).m().e()
type A B
type B interface {
m() interface{C}
E
}
type C A
// Check that interface type comparison for identity
// does not recur endlessly.
type T1 interface {
m() interface{T1}
}
type T2 interface {
m() interface{T2}
}
func _(x T1, y T2) {
// Checking for assignability of interfaces must check
// if all methods of x are present in y, and that they
// have identical signatures. The signatures recur via
// the result type, which is an interface that embeds
// a single method m that refers to the very interface
// that contains it. This requires cycle detection in
// identity checks for interface types.
x = y
}
type T3 interface {
m() interface{T4}
}
type T4 interface {
m() interface{T3}
}
func _(x T1, y T3) {
x = y
}