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typing: make the localrepo classes known to pytype...
typing: make the localrepo classes known to pytype 9d4ad05bc91c and 1b17309cdaab both mentioned making `bundlerepository` and `unionrepository` subclass `localrepository` during the type checking phase, but that didn't apply to pytype in practice. See bcaa5d408657 and friends for how the zope interfaces confuse pytype, and end up converting the classes they decorate into `Any`. This commit is slightly more complex though, because `localrepository` has mixin classes applied to it when it is instantiated. Specifically, `RevlogFileStorage` is added, which adds `def file(f)` (which isn't defined on `localrepository`). Therefore a list of `localrepository` superclasses is provided during type checking to account for the mixins. Without this, the `bundlerepository` class gets flagged when it attempts to call its superclass implementation of `file()`. Note that pytype doesn't understand these mixin superclasses (it marks the superclass of `localrepository` as `Any`, because they are zope interfaces it doesn't understand), but that's enough to get it to not flag `bundlerepository`. PyCharm also stops flagging it as a missing function, though it seems like it is able to handle the zope interfaces.
Matt Harbison - - Load All Authors

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extensions.txt
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Mercurial has the ability to add new features through the use of
extensions. Extensions may add new commands, add options to
existing commands, change the default behavior of commands, or
implement hooks.
To enable the "foo" extension, either shipped with Mercurial or in the
Python search path, create an entry for it in your configuration file,
like this::
[extensions]
foo =
You may also specify the full path to an extension::
[extensions]
myfeature = ~/.hgext/myfeature.py
See :hg:`help config` for more information on configuration files.
Extensions are not loaded by default for a variety of reasons:
they can increase startup overhead; they may be meant for advanced
usage only; they may provide potentially dangerous abilities (such
as letting you destroy or modify history); they might not be ready
for prime time; or they may alter some usual behaviors of stock
Mercurial. It is thus up to the user to activate extensions as
needed.
To explicitly disable an extension enabled in a configuration file of
broader scope, prepend its path with !::
[extensions]
# disabling extension bar residing in /path/to/extension/bar.py
bar = !/path/to/extension/bar.py
# ditto, but no path was supplied for extension baz
baz = !