golang a 代码
文件路径：/test/typeparam/factimp.dir/a.go
// 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
func Fact[T interface{ int | int64 | float64 }](n T) T {
if n == 1 {
return 1
}
return n * Fact(n-1)
}