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[dev.ssa] cmd/compile/internal/gc: handle _ label correctly
An empty label statement can just be ignored, as it cannot be the target of any gotos. Tests are already in test/fixedbugs/issue7538*.go Fixes #11589 Fixes #11593 Change-Id: Iadcd639e7200ce16aa40fd7fa3eaf82522513e82 Reviewed-on: https://go-review.googlesource.com/12093 Reviewed-by: Daniel Morsing <daniel.morsing@gmail.com> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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@ -316,6 +316,11 @@ func (s *state) stmt(n *Node) {
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s.assign(OAS, n.Left.Name.Heapaddr, palloc)
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case OLABEL, OGOTO:
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if n.Op == OLABEL && isblanksym(n.Left.Sym) {
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// Empty identifier is valid but useless.
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// See issues 11589, 11593.
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return
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}
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// get block at label, or make one
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t := s.labels[n.Left.Sym.Name]
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if t == nil {
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