pycompat: introduce identity function as a compat stub
I was sometimes too lazy to use 'str' instead of 'lambda a: a'. Let's add
a named function for that purpose.
#require test-repo pylint hg10
Run pylint for known rules we care about.
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There should be no recorded failures; fix the codebase before introducing a
new check.
Current checks:
- W0102: no mutable default argument
$ touch $TESTTMP/fakerc
$ pylint --rcfile=$TESTTMP/fakerc --disable=all \
> --enable=W0102 --reports=no \
> mercurial hgext hgext3rd