[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>

1 files changed, 29 insertions, 0 deletions

diff --git a/src/cmd/compile/internal/types2/testdata/examples/operations.go2 b/src/cmd/compile/internal/types2/testdata/examples/operations.go2
new file mode 100644
index 0000000000..18e4d6080c
--- /dev/null
+++ b/src/cmd/compile/internal/types2/testdata/examples/operations.go2
@@ -0,0 +1,29 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+// indirection
+
+func _[P any](p P) {
+        _ = *p // ERROR cannot indirect p
+}
+
+func _[P interface{ int }](p P) {
+        _ = *p // ERROR cannot indirect p
+}
+
+func _[P interface{ *int }](p P) {
+        _ = *p
+}
+
+func _[P interface{ *int | *string }](p P) {
+        _ = *p // ERROR must have identical base types
+}
+
+type intPtr *int
+
+func _[P interface{ *int | intPtr } ](p P) {
+        var _ int = *p
+}