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cmd/compile/internal/gc: add comment and test for #15550
When switching to the new parser, I changed cmd/compile to handle iota per an intuitive interpretation of how nested constant declarations should work (which also matches go/types). Note: if we end up deciding that the current spec wording is intentional (i.e., confirming gccgo's current behavior), the test will need to be updated to expect 4 instead of 1. Updates #15550. Change-Id: I441f5f13209f172b73ef75031f2a9daa5e985277 Reviewed-on: https://go-review.googlesource.com/36122 Reviewed-by: David Crawshaw <crawshaw@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org> Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com> Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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@ -204,6 +204,9 @@ func (p *noder) varDecl(decl *syntax.VarDecl) []*Node {
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return variter(names, typ, exprs)
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}
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// constState tracks state between constant specifiers within a
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// declaration group. This state is kept separate from noder so nested
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// constant declarations are handled correctly (e.g., issue 15550).
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type constState struct {
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group *syntax.Group
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typ *Node
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28
test/fixedbugs/issue15550.go
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28
test/fixedbugs/issue15550.go
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@ -0,0 +1,28 @@
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// run
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// Copyright 2017 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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import "unsafe"
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const (
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_ = unsafe.Sizeof(func() int {
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const (
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_ = 1
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_
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_
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)
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return 0
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}())
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y = iota
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)
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func main() {
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if y != 1 {
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panic(y)
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}
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}
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