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// Copyright 2020 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
func _[T any](x interface{}){
switch x.(type) {
case T: // ok to use a type parameter
case int:
}
switch x.(type) {
case T:
case T /* ERROR "duplicate case" */ :
}
}
type constraint interface {
~int
}
func _[T constraint](x interface{}){
switch x.(type) {
case T: // ok to use a type parameter even if type set contains int
case int:
}
}
func _(x constraint /* ERROR "contains type constraints" */ ) {
switch x.(type) { // no need to report another error
}
}