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cmd/compile: fix another invalid switch case panic
Very similar fix to the one made in golang.org/cl/65655. This time it's for switches on interface values, as we look for duplicates in a different manner to keep types in mind. As before, add a small regression test. Updates #22001. Fixes #22063. Change-Id: I9a55d08999aeca262ad276b4649b51848a627b02 Reviewed-on: https://go-review.googlesource.com/66450 Run-TryBot: Daniel Martí <mvdan@mvdan.cc> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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@ -640,6 +640,11 @@ func checkDupExprCases(exprname *Node, clauses []*Node) {
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if ct := consttype(n); ct < 0 || ct == CTBOOL {
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continue
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}
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// If the value has no type, we have
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// already printed an error about it.
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if n.Type == nil {
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continue
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}
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tv := typeVal{
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typ: n.Type.LongString(),
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val: n.Val().Interface(),
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17
test/fixedbugs/issue22063.go
Normal file
17
test/fixedbugs/issue22063.go
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@ -0,0 +1,17 @@
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// errorcheck
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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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// Issue 22063: panic on interface switch case with invalid name
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package p
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const X = Wrong(0) // ERROR "undefined: Wrong"
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func _() {
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switch interface{}(nil) {
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case X:
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}
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}
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