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go/test/fixedbugs/issue17588.go

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// errorcheck
// Copyright 2016 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 17588: internal compiler error in typecheckclosure()
// because in case of Func.Nname.Type == nil, Decldepth
// is not initialized in typecheckfunc(). This test
// produces that case.
package p
type F func(b T) // ERROR "T is not a type"
func T(fn F) {
func() {
fn(nil) // If Decldepth is not initialized properly, typecheckclosure() Fatals here.
}()
}