tests/unwrap-message-id.py

errors: move Abort earlier, so more exceptions can subclass it

I'd like to make at least `InterventionRequired` subclass `Abort` and
Python requires the superclass to be defined before the subtype.

Differential Revision: https://phab.mercurial-scm.org/D10736

from __future__ import absolute_import, print_function

import sys

for line in sys.stdin:
    if line.lower() in ("message-id: \n", "in-reply-to: \n"):
        line = line[:-2]
    print(line, end="")