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// 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
type T[P any] struct{}
func _(x interface{}) {
switch x.(type) {
case nil:
case int:
case T[int]:
case []T[int]:
case [10]T[int]:
case struct{T[int]}:
case *T[int]:
case func(T[int]):
case interface{m(T[int])}:
case map[T[int]] string:
case chan T[int]:
case T /* ERROR "cannot use generic type T[P any] without instantiation" */ :
case []T /* ERROR "cannot use generic type" */ :
case [10]T /* ERROR "cannot use generic type" */ :
case struct{T /* ERROR "cannot use generic type" */ }:
case *T /* ERROR "cannot use generic type" */ :
case func(T /* ERROR "cannot use generic type" */ ):
case interface{m(T /* ERROR "cannot use generic type" */ )}:
case map[T /* ERROR "cannot use generic type" */ ] string:
case chan T /* ERROR "cannot use generic type" */ :
case T /* ERROR "cannot use generic type" */ , *T /* ERROR "cannot use generic type" */ :
}
}
// Make sure a parenthesized nil is ok.
func _(x interface{}) {
switch x.(type) {
case ((nil)), int:
}
}
// Make sure we look for the predeclared nil.
func _(x interface{}) {
type nil int
switch x.(type) {
case nil: // ok - this is the type nil
}
}
func _(x interface{}) {
var nil int
switch x.(type) {
case nil /* ERROR "not a type" */ : // not ok - this is the variable nil
}
}