llgo/cl/_testgo/errors/in.go

package main

// New returns an error that formats as the given text.
// Each call to New returns a distinct error value even if the text is identical.
func New(text string) error {
	return &errorString{text}
}

// errorString is a trivial implementation of error.
type errorString struct {
	s string
}

func (e *errorString) Error() string {
	return e.s
}

func main() {
	println("main")
	err := New("an error")
	println("err")
	println(err, err.Error())
}