// run
// Copyright 2010 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.
// https://golang.org/issue/749
package main
func f() (ok bool) { return false }
func main() {
var i interface{}
i = f
_ = i.(func()bool)
_ = i.(func()(bool))
}