tests/fakemergerecord.py

typing: fix a syntax error in mercurial/cext/bdiff.pyi

I noticed because `merge-pyi` on the non-cext implementations with this file as
input skipped the return type for this.  `pytype-single --parse-pyi` confirmed
it was a problem.

# Extension to write out fake unsupported records into the merge state
#
#


from mercurial import (
    mergestate as mergestatemod,
    registrar,
)

cmdtable = {}
command = registrar.command(cmdtable)


@command(
    b'fakemergerecord',
    [
        (b'X', b'mandatory', None, b'add a fake mandatory record'),
        (b'x', b'advisory', None, b'add a fake advisory record'),
    ],
    '',
)
def fakemergerecord(ui, repo, *pats, **opts):
    with repo.wlock():
        ms = mergestatemod.mergestate.read(repo)
        records = ms._makerecords()
        if opts.get('mandatory'):
            records.append((b'X', b'mandatory record'))
        if opts.get('advisory'):
            records.append((b'x', b'advisory record'))
        ms._writerecords(records)