文件操作 - issue52026.go
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文件: /usr/share/go-1.23/test/typeparam/issue52026.go
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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 returnOption[T any](n int) Option[T] { if n == 1 { return Some[T]{} } else { return None{} } } type Option[T any] interface { sealedOption() } type Some[T any] struct { val T } func (s Some[T]) Value() T { return s.val } func (s Some[T]) sealedOption() {} type None struct{} func (s None) sealedOption() {} func main() { s := returnOption[int](1) _ = s.(Some[int]) s = returnOption[int](0) _ = s.(None) switch (any)(s).(type) { case Some[int]: panic("s is a Some[int]") case None: // ok default: panic("oops") } }
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