go/test/fixedbugs/issue32595.dir/a.go

// Copyright 2019 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 a

func A() {
	defer func() {}()
}
cmd/compile: don't mark argument array as noalg It ends up making two similar types, [N]uint8 of both alg and noalg varieties. Comparsions between the two then don't come out equal when they should. In particular, the type [N]uint8 has an Elem pointer which must point to one of the above two types; it can't point to both. Thus allocating a [N]uint8 and dereferencing it might be a different type than a [N]uint8. The fix is easy. Making a small test for this is really hard. It requires that both a argless defer and the test be imported by a common parent package. This is why a main binary doesn't see this issue, but a test does (as Agniva noticed), because there's a wrapper package that imports both the test and the defer. Types like [N]uint8 don't really need to be marked noalg anyway, as the generated code (if any) will be shared among all vanilla memory types of the same size. Fixes #32595 Change-Id: If7b77fa6ed56cd4495601c3f90170682d853b82f Reviewed-on: https://go-review.googlesource.com/c/go/+/182357 Run-TryBot: Keith Randall <khr@golang.org> Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com> Reviewed-by: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> 2019-06-13 20:11:25 -06:00			`// Copyright 2019 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 a`

			`func A() {`
			`defer func() {}()`
			`}`