1 files changed, 21 insertions, 0 deletions
diff --git a/test/typeparam/issue48453.go b/test/typeparam/issue48453.go
new file mode 100644
index 0000000000..0f751d38ed
--- /dev/null
+++ b/test/typeparam/issue48453.go
@@ -0,0 +1,21 @@
+// 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
+
+//go:noinline
+func CopyMap[M interface{ ~map[K]V }, K comparable, V any](m M) M {
+	out := make(M, len(m))
+	for k, v := range m {
+		out[k] = v
+	}
+	return out
+}
+
+func main() {
+	var m map[*string]int
+	CopyMap(m)
+}