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
head: 1.2
branch:
locks: strict
access list:
symbolic names:
MYBRANCH1_2: 1.1.2.2.0.2
MYBRANCH1_1: 1.1.0.4
MYBRANCH1: 1.1.0.2
keyword substitution: kv
total revisions: 8; selected revisions: 8
description:
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revision 1.2
date: 2009/04/02 07:00:32; author: user; state: Exp; lines: +1 -1; kopt: kv; commitid: 14d449d462903487; mergepoint: 1.1.2.2.2.1; filename: foo.txt;
merge
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revision 1.1
date: 2009/04/02 06:50:43; author: user; state: Exp; kopt: kv; commitid: 17ac49d460432d04; filename: foo.txt;
branches: 1.1.2; 1.1.4;
foo.txt
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revision 1.1.4.2
date: 2009/04/02 07:02:51; author: user; state: Exp; lines: +1 -0; kopt: kv; commitid: 170049d4631b364d; mergepoint: 1.1.2.2; filename: foo.txt;
merge
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revision 1.1.4.1
date: 2009/04/02 06:53:42; author: user; state: Exp; lines: +1 -1; kopt: kv; commitid: dc849d460f52f49; filename: foo.txt;
quux
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revision 1.1.2.2
date: 2009/04/02 06:53:20; author: user; state: Exp; lines: +1 -1; kopt: kv; commitid: 8ec49d460e02f04; filename: foo.txt;
branches: 1.1.2.2.2;
baz
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revision 1.1.2.1
date: 2009/04/02 06:52:38; author: user; state: Exp; lines: +1 -1; kopt: kv; commitid: d5049d460b62e7b; filename: foo.txt;
bar
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revision 1.1.2.2.2.1
date: 2009/04/02 06:55:42; author: user; state: Exp; lines: +1 -1; kopt: kv; commitid: 11c849d4616d30d1; filename: foo.txt;
bazzie
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