type gobError … // errorf is like error_ but takes Printf-style arguments to construct an error. // It always prefixes the message with "gob: ". func errorf(format string, args ...any) { … } // error_ wraps the argument error and uses it as the argument to panic. func error_(err error) { … } // catchError is meant to be used as a deferred function to turn a panic(gobError) into a // plain error. It overwrites the error return of the function that deferred its call. func catchError(err *error) { … }