go issue47747 源码
golang issue47747 代码
文件路径：/src/cmd/compile/internal/types2/testdata/fixedbugs/issue47747.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 p
// For now, a lone type parameter is not permitted as RHS in a type declaration (issue #45639).
// type T1[P any] P
//
// func (T1[_]) m() {}
//
// func _[P any](x *T1[P]) {
// // x.m exists because x is of type *T1 where T1 is a defined type
// // (even though under(T1) is a type parameter)
// x.m()
// }
func _[P interface{ m() }](x P) {
x.m()
// (&x).m doesn't exist because &x is of type *P
// and pointers to type parameters don't have methods
(&x).m /* ERROR type \*P is pointer to type parameter, not type parameter */ ()
}
type T2 interface{ m() }
func _(x *T2) {
// x.m doesn't exists because x is of type *T2
// and pointers to interfaces don't have methods
x.m /* ERROR type \*T2 is pointer to interface, not interface */()
}
// Test case 1 from issue
type Fooer1[t any] interface {
Foo(Barer[t])
}
type Barer[t any] interface {
Bar(t)
}
// For now, a lone type parameter is not permitted as RHS in a type declaration (issue #45639).
// type Foo1[t any] t
// type Bar[t any] t
//
// func (l Foo1[t]) Foo(v Barer[t]) { v.Bar(t(l)) }
// func (b *Bar[t]) Bar(l t) { *b = Bar[t](l) }
//
// func _[t any](f Fooer1[t]) t {
// var b Bar[t]
// f.Foo(&b)
// return t(b)
// }
// Test case 2 from issue
// For now, a lone type parameter is not permitted as RHS in a type declaration (issue #45639).
// type Fooer2[t any] interface {
// Foo()
// }
//
// type Foo2[t any] t
//
// func (f *Foo2[t]) Foo() {}
//
// func _[t any](v t) {
// var f = Foo2[t](v)
// _ = Fooer2[t](&f)
// }
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