1 files changed, 29 insertions, 0 deletions
diff --git a/test/typeparam/adder.go b/test/typeparam/adder.go
new file mode 100644
index 0000000000..0c25ad4ef2
--- /dev/null
+++ b/test/typeparam/adder.go
@@ -0,0 +1,29 @@
+// 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
+
+import (
+	"fmt"
+)
+
+type AddType interface {
+	type int, int64, string
+}
+
+// _Add can add numbers or strings
+func _Add[T AddType](a, b T) T {
+	return a + b
+}
+
+func main() {
+	if got, want := _Add(5, 3), 8; got != want {
+		panic(fmt.Sprintf("got %d, want %d", got, want))
+	}
+	if got, want := _Add("ab", "cd"), "abcd"; got != want {
+		panic(fmt.Sprintf("got %d, want %d", got, want))
+	}
+}