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go/test/fixedbugs/issue28079a.go
Keith Randall eb6c433eb3 cmd/compile: don't convert non-Go-constants to OLITERALs
Don't convert values that aren't Go constants, like
uintptr(unsafe.Pointer(nil)), to a literal constant. This avoids
assuming they are constants for things like indexing, array sizes,
case duplication, etc.

Also, nil is an allowed duplicate in switches. CTNILs aren't Go constants.

Fixes #28078
Fixes #28079

Change-Id: I9ab8af47098651ea09ef10481787eae2ae2fb445
Reviewed-on: https://go-review.googlesource.com/c/151320
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-11-27 01:21:41 +00:00

21 lines
396 B
Go

// compile
// Copyright 2018 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.
// Non-Go-constant but constant indexes are ok at compile time.
package p
import "unsafe"
func f() {
var x [0]int
x[uintptr(unsafe.Pointer(nil))] = 0
}
func g() {
var x [10]int
_ = x[3:uintptr(unsafe.Pointer(nil))]
}