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go/test/fixedbugs/issue17588.go
Cuong Manh Le 70b277cf2e cmd/compile: only check return for valid functions
CheckReturn uses fn.Type() unconditionally, so for invalid function,
fn.Type() will be nil, causes the compiler crashes.

Updates #43311

Change-Id: I4420dd296c72ea83986b38fbf2c7f51fa59757c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/298709
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2021-03-05 18:45:59 +00:00

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Go

// errorcheck -d=panic
// 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|expected type"
func T(fn F) {
func() {
fn(nil) // If Decldepth is not initialized properly, typecheckclosure() Fatals here.
}()
}