test/typeparam: add a test case for issue46591

Fixes #46591

Change-Id: I4875092ecd7760b0cd487e793576ef7a9a569a0e
Reviewed-on: https://go-review.googlesource.com/c/go/+/343970
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>

diff --git a/test/typeparam/issue46591.go b/test/typeparam/issue46591.go
new file mode 100644 (file)
index 0000000..e7b9fa2
--- /dev/null
+++ b/test/typeparam/issue46591.go
@@ -0,0 +1,22 @@
+// run -gcflags=-G=3
+
+// 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 main
+
+type T[_ any] struct{}
+
+var m = map[interface{}]int{
+       T[struct{ int }]{}: 0,
+       T[struct {
+               int "x"
+       }]{}: 0,
+}
+
+func main() {
+       if len(m) != 2 {
+               panic(len(m))
+       }
+}