tests/sitecustomize.py

subrepo: clone of git sub-repository creates incorrect git branch (issue3870)

Mercurial handles git subrepos by incorrect way.
If the mercurial repo has a git sub-repo and somebody started
a new branch in the subrepo and push it into git, the next one
who will clone the whole repo will get incorrect branch name in the git
subrepo.

try:
    import coverage
    getattr(coverage, 'process_startup', lambda: None)()
except ImportError:
    pass