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[dev.typeparams] cmd/compile: handle ONONAME in subster.node
Fixes #46472 Change-Id: I27802978fa0c3bb32a29e452165a6fcac93473bb Reviewed-on: https://go-review.googlesource.com/c/go/+/323731 Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com> Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Dan Scales <danscales@google.com>
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@ -350,6 +350,9 @@ func (subst *subster) node(n ir.Node) ir.Node {
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return v
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}
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return x
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case ir.ONONAME:
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// This handles the identifier in a type switch guard
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fallthrough
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case ir.OLITERAL, ir.ONIL:
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if x.Sym() != nil {
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return x
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20
test/typeparam/issue46472.go
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20
test/typeparam/issue46472.go
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@ -0,0 +1,20 @@
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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 foo[T any](d T) {
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switch v := interface{}(d).(type) {
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case string:
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if v != "x" {
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panic("unexpected v: "+v)
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}
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}
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}
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func main() {
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foo("x")
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}
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