1 files changed, 37 insertions, 0 deletions
diff --git a/test/typeparam/issue47708.go b/test/typeparam/issue47708.go
new file mode 100644
index 0000000..d6140f3
--- /dev/null
+++ b/test/typeparam/issue47708.go
@@ -0,0 +1,37 @@
+// run
+
+// 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 FooType[T any] interface {
+	Foo(BarType[T]) string
+}
+type BarType[T any] interface {
+	Bar(FooType[T]) string
+}
+
+// For now, a lone type parameter is not permitted as RHS in a type declaration (issue #45639).
+// type Baz[T any] T
+// func (l Baz[T]) Foo(v BarType[T]) string {
+// 	return v.Bar(l)
+// }
+// type Bob[T any] T
+// func (l Bob[T]) Bar(v FooType[T]) string {
+// 	if v,ok := v.(Baz[T]);ok{
+// 		return fmt.Sprintf("%v%v",v,l)
+// 	}
+// 	return ""
+// }
+
+func main() {
+	// For now, a lone type parameter is not permitted as RHS in a type declaration (issue #45639).
+	// var baz Baz[int] = 123
+	// var bob Bob[int] = 456
+	//
+	// if got, want := baz.Foo(bob), "123456"; got != want {
+	// 	panic(fmt.Sprintf("got %s want %s", got, want))
+	// }
+}