Hi, this patchset enables strict optional checking in mypy for
everything we have typed so far.

In general, this patchset seeks to eliminate Optional[T] in favor of T
wherever possible. Optional types used for object properties,
function/method parameters and return values where we expect, in most
cases, to be non-None is troublesome as it requires peppering the code
with assertions about state. If and whenever possible, prefer using
non-Optional types.

Ironing out these issues allows us to be even stricter with our type
checking, which improves consistency in subclass interface types and
should make review a little nicer.

This series is based on (but does not require) the 'qapi: sphinx-autodoc
for qapi module' series.

John Snow (12):
  qapi/commands: assert arg_type is not None
  qapi/events: fix visit_event typing
  qapi/main: handle theoretical None-return from re.match()
  qapi/gen: assert that _start_if is not None in _wrap_ifcond
  qapi/gen: use './builtin' for the built-in module name
  qapi/source: Add builtin null-object sentinel
  qapi/gen: write _genc/_genh access shims
  qapi/schema: make QAPISourceInfo mandatory
  qapi/gen: move write method to QAPIGenC, make fname a str
  tests/qapi-schema: Add quotes to module name in test output
  qapi/schema: Name the builtin module "" instead of None
  qapi: enable strict-optional checks

 scripts/qapi/commands.py                 |  11 ++-
 scripts/qapi/events.py                   |  14 +--
 scripts/qapi/gen.py                      | 107 ++++++++++++-----------
 scripts/qapi/main.py                     |   3 +-
 scripts/qapi/mypy.ini                    |   1 -
 scripts/qapi/schema.py                   |  33 +++----
 scripts/qapi/source.py                   |  20 ++++-
 scripts/qapi/types.py                    |  11 +--
 scripts/qapi/visit.py                    |   8 +-
 tests/qapi-schema/comments.out           |   4 +-
 tests/qapi-schema/doc-good.out           |   4 +-
 tests/qapi-schema/empty.out              |   4 +-
 tests/qapi-schema/event-case.out         |   4 +-
 tests/qapi-schema/include-repetition.out |   8 +-
 tests/qapi-schema/include-simple.out     |   6 +-
 tests/qapi-schema/indented-expr.out      |   4 +-
 tests/qapi-schema/qapi-schema-test.out   |   8 +-
 tests/qapi-schema/test-qapi.py           |   2 +-
 18 files changed, 143 insertions(+), 109 deletions(-)

-- 
2.26.2