macOS issues: _Nullable _Nonnull

[waywardmonkeys]

The first issues that I've run into on macOS are from system headers and I've worked around them by doing:

corrode ... -D_Nonnull="/**/" -D_Nullable="/**/"

This was actually fixed in language-c in an as-yet-unreleased 0.5.1 a couple of months ago.

[jameysharp]

I guess we'll have to keep this issue open until language-c has a new Hackage release that includes visq/language-c#6. Thanks for reporting it!

[waywardmonkeys]

In practice, it might be better to add support for that attribute in language-c instead of ignoring it like the change in visq/language-c#6 did. That would let you have better data on whether or not you should use Option.

[waywardmonkeys]

I am actually wrong and it isn't ignoring them, but tracking them, so the data should be available for use here.