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cmd/compile: fix the index variable is shadowed in dictPass
The CL 349613 causes this problem. In fact, we want to use the outer i to find m.List[i], but the newly created index variable i in the nearest for range shadow the outer i. Fixes #48838. Change-Id: I10f0bd985340f9443eefaadda6fc56e4e7e9a10c Reviewed-on: https://go-review.googlesource.com/c/go/+/354549 Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Dan Scales <danscales@google.com> Trust: Dan Scales <danscales@google.com>
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@ -1298,9 +1298,9 @@ func (g *irgen) dictPass(info *instInfo) {
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// Type switch from nonempty interface. We need a *runtime.itab
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// for the dynamic type.
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ix := -1
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for i, ic := range info.dictInfo.itabConvs {
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for j, ic := range info.dictInfo.itabConvs {
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if ic == m.List[i] {
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ix = info.dictInfo.startItabConv + i
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ix = info.dictInfo.startItabConv + j
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break
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}
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}
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31
test/typeparam/issue48838.go
Normal file
31
test/typeparam/issue48838.go
Normal file
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@ -0,0 +1,31 @@
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// run -gcflags=-G=3
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// Copyright 2021 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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func main() {
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check[string]()
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}
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func check[T any]() {
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var result setter[T]
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switch result.(type) {
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case fooA[T]:
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case fooB[T]:
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}
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}
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type setter[T any] interface {
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Set(T)
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}
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type fooA[T any] struct{}
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func (fooA[T]) Set(T) {}
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type fooB[T any] struct{}
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func (fooB[T]) Set(T) {}
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