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// run
// Copyright 2017 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
import (
"fmt"
"strings"
)
type ET struct{}
func (*ET) Error() string { return "err" }
func main() {
check("false", fmt.Sprintf("(*ET)(nil) == error(nil): %v", (*ET)(nil) == error(nil)))
check("true", fmt.Sprintf("(*ET)(nil) != error(nil): %v", (*ET)(nil) != error(nil)))
nilET := (*ET)(nil)
nilError := error(nil)
check("false", fmt.Sprintf("nilET == nilError: %v", nilET == nilError))
check("true", fmt.Sprintf("nilET != nilError: %v", nilET != nilError))
}
func check(want, gotfull string) {
got := gotfull[strings.Index(gotfull, ": ")+len(": "):]
if got != want {
panic("want " + want + " got " + got + " from " + gotfull)
}
}