#!/usr/bin/env python

"""
Example of bug https://bugs.python.org/issue28603

Under Python2, this prints the traceback from the UnhashableException and
continues, eventually printing "Hello world".

Under Python3, this exits silently for no discernable reason.
"""

import sys
import traceback

sys.stderr = None


class UnhashableException(Exception):
    def __eq__(self, other):
        return NotImplemented


def print_exception(exc_info):
    print(''.join(traceback.format_exception(*exc_info)))


def test():
    try:
        raise UnhashableException()
    except UnhashableException:
        print_exception(sys.exc_info())


if __name__ == '__main__':
    print("Hello world!")
    try:
        test()
    except Exception:
        print_exception(sys.exc_info())
    print("Goodbye!")