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// Copyright 2019 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.
// This file contains tests for the errorsas checker.
package a
import "errors"
type myError[T any] struct{ t T }
func (myError[T]) Error() string { return "" }
type twice[T any] struct {
t T
}
func perr[T any]() *T { return nil }
func two[T any]() (error, *T) { return nil, nil }
func _[E error](e E) {
var (
m myError[int]
tw twice[myError[int]]
)
errors.As(nil, &e)
errors.As(nil, &m) // *T where T implemements error
errors.As(nil, &tw.t) // *T where T implements error
errors.As(nil, perr[error]()) // *error, via a call
errors.As(nil, e) // want `second argument to errors.As must be a non-nil pointer to either a type that implements error, or to any interface type`
errors.As(nil, m) // want `second argument to errors.As must be a non-nil pointer to either a type that implements error, or to any interface type`
errors.As(nil, tw.t) // want `second argument to errors.As must be a non-nil pointer to either a type that implements error, or to any interface type`
errors.As(two[error]())
}
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