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[dev.typeparams] cmd/compile/internal/types2: fix generic type indirection
Change-Id: If25ceb2aa403b94608760be331faa2aff11c47cc Reviewed-on: https://go-review.googlesource.com/c/go/+/333890 Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
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@ -1479,13 +1479,24 @@ func (check *Checker) exprInternal(x *operand, e syntax.Expr, hint Type) exprKin
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case typexpr:
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x.typ = &Pointer{base: x.typ}
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default:
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if typ := asPointer(x.typ); typ != nil {
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x.mode = variable
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x.typ = typ.base
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} else {
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check.errorf(x, invalidOp+"cannot indirect %s", x)
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var base Type
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if !underIs(x.typ, func(u Type) bool {
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p, _ := u.(*Pointer)
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if p == nil {
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check.errorf(x, invalidOp+"cannot indirect %s", x)
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return false
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}
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if base != nil && !Identical(p.base, base) {
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check.errorf(x, invalidOp+"pointers of %s must have identical base types", x)
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return false
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}
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base = p.base
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return true
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}) {
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goto Error
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}
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x.mode = variable
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x.typ = base
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}
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break
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}
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29
src/cmd/compile/internal/types2/testdata/examples/operations.go2
vendored
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29
src/cmd/compile/internal/types2/testdata/examples/operations.go2
vendored
Normal file
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@ -0,0 +1,29 @@
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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 p
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// indirection
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func _[P any](p P) {
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_ = *p // ERROR cannot indirect p
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}
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func _[P interface{ int }](p P) {
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_ = *p // ERROR cannot indirect p
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}
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func _[P interface{ *int }](p P) {
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_ = *p
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}
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func _[P interface{ *int | *string }](p P) {
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_ = *p // ERROR must have identical base types
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}
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type intPtr *int
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func _[P interface{ *int | intPtr } ](p P) {
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var _ int = *p
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}
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