diff mercurial/cmdutil.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

--- a/mercurial/cmdutil.py	Sun Oct 06 13:17:19 2019 -0400
+++ b/mercurial/cmdutil.py	Sun Oct 06 13:28:56 2019 -0400
@@ -19,6 +19,7 @@
     nullrev,
     short,
 )
+from .pycompat import open
 
 from . import (
     bookmarks,