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The StaticInit pass asserts that the operand of &v is a global, but this is not so for the &autotemp desugaring of new(expr). (The variable has by that point escaped to the heap, so the object code calls runtime.newobject. A future optimization would be to statically allocate the variable when it is safe and advantageous to do so.) Thanks to khr for suggesting the fix. + static test Fixes #77237 Change-Id: I71b34a1353fe0f3e297beab9851f8f87d765d8f1 Reviewed-on: https://go-review.googlesource.com/c/go/+/737680 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
47 lines
863 B
Go
47 lines
863 B
Go
// run
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// Copyright 2025 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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// Issue #45624 is the proposal to accept new(expr) in go1.26.
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// Here we test its run-time behavior.
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func main() {
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{
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p := new(123) // untyped constant expr
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if *p != 123 {
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panic("wrong value")
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}
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}
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{
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x := 42
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p := new(x) // non-constant expr
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if *p != x {
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panic("wrong value")
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}
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}
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{
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x := [2]int{123, 456}
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p := new(x) // composite value
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if *p != x {
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panic("wrong value")
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}
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}
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{
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var i int
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v := new(i > 0) // untyped expression, see issue #75617
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if *v != false {
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panic("wrong value")
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}
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}
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}
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// Regression test for ICE in staticdata.GlobalLinksym from
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// use of autotemp outside a function (go.dev/issue/77237).
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var (
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x = new(0)
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y = x
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)
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