worker: support more return types in posix worker
This allows us to return things that aren't tuple(int, str) from worker
functions. I wanted to use marshal instead of pickle, but it seems to read from
the pipe in non-blocking mode, which means it stops before it sees the results.
The windows worker already supports arbitrary return values without
serialization, because it uses threads instead of subprocesses.
Differential Revision: https://phab.mercurial-scm.org/D3845
#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=$TESTTMP/fakerc --disable=all \
> --enable=W0102,C0321 \
> --reports=no \
> --ignore=thirdparty \
> mercurial hgdemandimport hgext hgext3rd | sed 's/\r$//'
Using config file *fakerc (glob) (?)
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