view mercurial/testing/__init__.py @ 39995:582676acaf6d

wireprotov2: derive "required" from presence of default value

If we define a default value for all optional arguments, we no
longer need to explicitly declare whether the argument is required.
Instead, we can derive it from the presence of a default value
callable.

Differential Revision: https://phab.mercurial-scm.org/D4790