comparison mercurial/context.py @ 43085:eef9a2d67051

py3: manually import pycompat.open into files that need it

We want to eliminate the source transformer. Currently it inserts
a `from mercurial.pycompat import ...` at the top of files to alias
some builtins.

This commit replaces the implicit import of `open` with an explicit
import on files that need it and changes the source transformer to
no longer import `open`.

As part of this, we needed to store an explicit local for `open` in
the Python 2 code path in `pycompat` so the import works. (Builtins
that are automatically in scope cannot be imported.)

Differential Revision: https://phab.mercurial-scm.org/D7005

43084:c2e284cee333

    nullrev,
    short,
    wdirfilenodeids,
    wdirhex,
)
from . import (
    copies,
    dagop,
    encoding,
    error,

43085:eef9a2d67051

    nullrev,
    short,
    wdirfilenodeids,
    wdirhex,
)
from .pycompat import open
from . import (
    copies,
    dagop,
    encoding,
    error,