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rust: Update the memmap2 crate to version 0.4.0

This version:

* Optionally implements the `StableDeref` trait, removing the need
  for a wrapper type doing that
* Adds support for mapping empty files, which can routinely happen
  for dirstate-v2 data files. This was a cause of some failing tests
  when running with `run-tests.py --rhg --extra-config-opt rhg.status=1`

Differential Revision: https://phab.mercurial-scm.org/D11446

#!/usr/bin/env python3
#
# An example hgweb CGI script, edit as necessary
# See also https://mercurial-scm.org/wiki/PublishingRepositories

# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = b"/path/to/repo/or/config"

# Uncomment and adjust if Mercurial is not installed system-wide
# (consult "installed modules" path from 'hg debuginstall'):
# import sys; sys.path.insert(0, "/path/to/python/lib")

# Uncomment to send python tracebacks to the browser if an error occurs:
# import cgitb; cgitb.enable()

from mercurial import demandimport

demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi

application = hgweb(config)
wsgicgi.launch(application)