3 // Copyright 2021 The Go Authors. All rights reserved.
4 // Use of this source code is governed by a BSD-style
5 // license that can be found in the LICENSE file.
9 type I[T any] interface {
13 type J[T any] interface {
19 func f[T J[T]](x T) I[T] {
20 // contains a cast between two nonempty interfaces