What I've implemented here deviates from the current proposal text
in the following ways:
- I had to introduce a FunctionArrowPrecedence to capture the parsing
of -> in expression contexts.
- I found it convenient to continue to model the assignment property
explicitly.
- The comparison and casting operators have historically been
non-associative; I have chosen to preserve that, since I don't
think this proposal intended to change it.
- This uses the precedence group names and higherThan/lowerThan
as agreed in discussion.
While making some changes that resulted in materializeForSet getting
synthesized more often, I noticed that some tests started failing
because they could not find the Optional type, which appears in the
type of materializeForSet. Fix these tests by defining an Optional
and passing in '-module-name Swift' so that we can find it.
This feels a little bit gross, but Dmitri says it is preferrable to
importing Swift from a test.
In most cases this means adding @public to things that get serialized;
in a few cases it means using a modern public stdlib API instead of
a legacy thing I was trying to keep @internal.
Swift SVN r19350
