error.go
func (err *Error) ErrorStack() string {
	return err.TypeName() + " " + err.Error() + "\n" + string(err.Stack())
}
func (err *Error) ErrorStack() string {
	return err.TypeName() + " " + err.Error() + "\n" + string(err.Stack())
}
func ( err * Error ) ErrorStack ( ) string { return err . TypeName ( ) + " " + err . Error ( ) + " \n " + string ( err . Stack ( ) ) }
// ErrorStack returns a string that contains both the
// error message and the callstack.
ErrorStack returns a string that contains both the error message and the callstack .