// Copyright 2020 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 Len[T any](s []T) int {
	return len(s)
}

func F1(s []int) int {
	return Len(s)
}

func main() {
	got := F1(nil) + F2(nil)
	if got != 0 {
		panic(got)
	}
}