1 files changed, 30 insertions, 0 deletions
diff --git a/test/typeparam/typeswitch6.go b/test/typeparam/typeswitch6.go
new file mode 100644
index 0000000000..574f4aa819
--- /dev/null
+++ b/test/typeparam/typeswitch6.go
@@ -0,0 +1,30 @@
+// 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
+
+func f[T any](i interface{}) {
+	switch i.(type) {
+	case T:
+		println("T")
+	case int:
+		println("int")
+	default:
+		println("other")
+	}
+}
+
+type myint int
+func (myint) foo() {
+}
+
+func main() {
+	f[interface{}](nil)
+	f[interface{}](6)
+	f[interface{foo()}](nil)
+	f[interface{foo()}](7)
+	f[interface{foo()}](myint(8))
+}