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// run
// Copyright 2022 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
func main() {
One[TextValue]()
}
func One[V Value]() { Two[Node[V]]() }
func Two[V interface{ contentLen() int }]() {
var v V
v.contentLen()
}
type Value interface {
Len() int
}
type Node[V Value] struct{}
func (Node[V]) contentLen() int {
var value V
return value.Len()
}
type TextValue struct{}
func (TextValue) Len() int { return 0 }
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