// errorcheck
// 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.
// Issue 22904: Make sure the compiler emits a proper error message about
// invalid recursive types rather than crashing.
package p
type a struct{ b }
type b struct{ a } // ERROR "invalid recursive type"
var x interface{}
func f() {
x = a{}
}