tests/test-check-pytype.t

errors: make exit codes class variables instead

Kyle pointed out to me that we can simply make the exit codes class
variables. Python provides some magic for making them accessible as
instance variables.

This also makes it easier to let subclasses of existing errors
override the exit codes by letting them simply define their own values
as class variables. That means that there's no need to pass them into
the superclass's constructor arguments, so the superclass doesn't need
to expose the them as arguments. (Making a subclass set a different
exit code for a subclass of `StorageError` was actually the goal with
my recent series.)

Differential Revision: https://phab.mercurial-scm.org/D10758

#require pytype py3 slow

  $ cd $RUNTESTDIR/..

Many of the individual files that are excluded here confuse pytype
because they do a mix of Python 2 and Python 3 things
conditionally. There's no good way to help it out with that as far as
I can tell, so let's just hide those files from it for now. We should
endeavor to empty this list out over time, as some of these are
probably hiding real problems.

mercurial/bundlerepo.py       # no vfs and ui attrs on bundlerepo
mercurial/changegroup.py      # mysterious incorrect type detection
mercurial/chgserver.py        # [attribute-error]
mercurial/cmdutil.py          # No attribute 'markcopied' on mercurial.context.filectx [attribute-error]
mercurial/context.py          # many [attribute-error]
mercurial/copies.py           # No attribute 'items' on None [attribute-error]
mercurial/crecord.py          # tons of [attribute-error], [module-attr]
mercurial/debugcommands.py    # [wrong-arg-types]
mercurial/dispatch.py         # initstdio: No attribute ... on TextIO [attribute-error]
mercurial/exchange.py         # [attribute-error]
mercurial/hgweb/hgweb_mod.py  # [attribute-error], [name-error], [wrong-arg-types]
mercurial/hgweb/server.py     # [attribute-error], [name-error], [module-attr]
mercurial/hgweb/webcommands.py  # [missing-parameter]
mercurial/hgweb/wsgicgi.py    # confused values in os.environ
mercurial/httppeer.py         # [attribute-error], [wrong-arg-types]
mercurial/interfaces          # No attribute 'capabilities' on peer [attribute-error]
mercurial/keepalive.py        # [attribute-error]
mercurial/localrepo.py        # [attribute-error]
mercurial/lsprof.py           # unguarded import
mercurial/manifest.py         # [unsupported-operands], [wrong-arg-types]
mercurial/minirst.py          # [unsupported-operands], [attribute-error]
mercurial/patch.py            # [wrong-arg-types]
mercurial/pure/osutil.py      # [invalid-typevar], [not-callable]
mercurial/pure/parsers.py     # [attribute-error]
mercurial/pycompat.py         # bytes vs str issues
mercurial/repoview.py         # [attribute-error]
mercurial/sslutil.py          # [attribute-error]
mercurial/statprof.py         # bytes vs str on TextIO.write() [wrong-arg-types]
mercurial/testing/storage.py  # tons of [attribute-error]
mercurial/ui.py               # [attribute-error], [wrong-arg-types]
mercurial/unionrepo.py        # ui, svfs, unfiltered [attribute-error]
mercurial/upgrade.py          # line 84, in upgraderepo: No attribute 'discard' on Dict[nothing, nothing] [attribute-error]
mercurial/util.py             # [attribute-error], [wrong-arg-count]
mercurial/utils/procutil.py   # [attribute-error], [module-attr], [bad-return-type]
mercurial/utils/stringutil.py # [module-attr], [wrong-arg-count]
mercurial/utils/memorytop.py  # not 3.6 compatible
mercurial/win32.py            # [not-callable]
mercurial/wireprotoframing.py # [unsupported-operands], [attribute-error], [import-error]
mercurial/wireprotoserver.py  # line 253, in _availableapis: No attribute '__iter__' on Callable[[Any, Any], Any] [attribute-error]
mercurial/wireprotov1peer.py  # [attribute-error]
mercurial/wireprotov1server.py  # BUG?: BundleValueError handler accesses subclass's attrs
mercurial/wireprotov2server.py  # [unsupported-operands], [attribute-error]

TODO: use --no-cache on test server?  Caching the files locally helps during
development, but may be a hinderance for CI testing.

  $ pytype -V 3.6 --keep-going --jobs auto mercurial \
  >    -x mercurial/bundlerepo.py \
  >    -x mercurial/changegroup.py \
  >    -x mercurial/chgserver.py \
  >    -x mercurial/cmdutil.py \
  >    -x mercurial/context.py \
  >    -x mercurial/copies.py \
  >    -x mercurial/crecord.py \
  >    -x mercurial/debugcommands.py \
  >    -x mercurial/dispatch.py \
  >    -x mercurial/exchange.py \
  >    -x mercurial/hgweb/hgweb_mod.py \
  >    -x mercurial/hgweb/server.py \
  >    -x mercurial/hgweb/webcommands.py \
  >    -x mercurial/hgweb/wsgicgi.py \
  >    -x mercurial/httppeer.py \
  >    -x mercurial/interfaces \
  >    -x mercurial/keepalive.py \
  >    -x mercurial/localrepo.py \
  >    -x mercurial/lsprof.py \
  >    -x mercurial/manifest.py \
  >    -x mercurial/minirst.py \
  >    -x mercurial/patch.py \
  >    -x mercurial/pure/osutil.py \
  >    -x mercurial/pure/parsers.py \
  >    -x mercurial/pycompat.py \
  >    -x mercurial/repoview.py \
  >    -x mercurial/sslutil.py \
  >    -x mercurial/statprof.py \
  >    -x mercurial/testing/storage.py \
  >    -x mercurial/thirdparty \
  >    -x mercurial/ui.py \
  >    -x mercurial/unionrepo.py \
  >    -x mercurial/upgrade.py \
  >    -x mercurial/utils/procutil.py \
  >    -x mercurial/utils/stringutil.py \
  >    -x mercurial/utils/memorytop.py \
  >    -x mercurial/win32.py \
  >    -x mercurial/wireprotoframing.py \
  >    -x mercurial/wireprotoserver.py \
  >    -x mercurial/wireprotov1peer.py \
  >    -x mercurial/wireprotov1server.py \
  >    -x mercurial/wireprotov2server.py \
  >  > $TESTTMP/pytype-output.txt || cat $TESTTMP/pytype-output.txt

Only show the results on a failure, because the output on success is also
voluminous and variable.