1 files changed, 56 insertions, 0 deletions
diff --git a/test/typeparam/issue47878.go b/test/typeparam/issue47878.go
new file mode 100644
index 0000000..25758cb
--- /dev/null
+++ b/test/typeparam/issue47878.go
@@ -0,0 +1,56 @@
+// compile
+
+// 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 Src1[T any] func() Src1[T]
+
+func (s *Src1[T]) Next() {
+	*s = (*s)()
+}
+
+type Src2[T any] []func() Src2[T]
+
+func (s Src2[T]) Next() {
+	_ = s[0]()
+}
+
+type Src3[T comparable] map[T]func() Src3[T]
+
+func (s Src3[T]) Next() {
+	var a T
+	_ = s[a]()
+}
+
+type Src4[T any] chan func() T
+
+func (s Src4[T]) Next() {
+	_ = (<-s)()
+}
+
+type Src5[T any] func() Src5[T]
+
+func (s Src5[T]) Next() {
+	var x interface{} = s
+	_ = (x.(Src5[T]))()
+}
+
+func main() {
+	var src1 Src1[int]
+	src1.Next()
+
+	var src2 Src2[int]
+	src2.Next()
+
+	var src3 Src3[string]
+	src3.Next()
+
+	var src4 Src4[int]
+	src4.Next()
+
+	var src5 Src5[int]
+	src5.Next()
+}