2 files changed, 44 insertions, 0 deletions
diff --git a/test/typeparam/issue48337a.dir/a.go b/test/typeparam/issue48337a.dir/a.go
new file mode 100644
index 0000000000..6f1b128589
--- /dev/null
+++ b/test/typeparam/issue48337a.dir/a.go
@@ -0,0 +1,32 @@
+// 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 a
+
+import (
+	"fmt"
+	"sync"
+)
+
+type WrapperWithLock[T any] interface {
+	PrintWithLock()
+}
+
+func NewWrapperWithLock[T any](value T) WrapperWithLock[T] {
+	return &wrapperWithLock[T]{
+		Object: value,
+	}
+}
+
+type wrapperWithLock[T any] struct {
+	Lock   sync.Mutex
+	Object T
+}
+
+func (w *wrapperWithLock[T]) PrintWithLock() {
+	w.Lock.Lock()
+	defer w.Lock.Unlock()
+
+	fmt.Println(w.Object)
+}
diff --git a/test/typeparam/issue48337a.dir/main.go b/test/typeparam/issue48337a.dir/main.go
new file mode 100644
index 0000000000..16f71153f3
--- /dev/null
+++ b/test/typeparam/issue48337a.dir/main.go
@@ -0,0 +1,12 @@
+// 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 "a"
+
+func main() {
+	obj := a.NewWrapperWithLock("this file does import sync")
+	obj.PrintWithLock()
+}