golang issue47925c 代码
文件路径：/test/typeparam/issue47925c.go
/ run
/ 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 main
type I[T any] interface {
foo()
}
type J[T any] interface {
foo()
bar()
}
/go:noinline
func f[T J[T]](x T) I[T] {
/ contains a cast between two nonempty interfaces
return I[T](J[T](x))
}
type S struct {
x int
}
func (s *S) foo() {}
func (s *S) bar() {}
func main() {
i := f(&S{x: 7})
if i.(*S).x != 7 {
panic("bad")
}
}