Jordan Rose 701975ad1d Add parsing support for @unknown (SE-0192) ...

This is our first statement attribute, made more complicated by the
fact that a 'case'/'default' isn't really a normal statement. I've
chosen /not/ to implement a general statement attribute logic like we
have for types and decls at this time, but I did get the compiler
parsing arbitrary attributes before 'case' and 'default'. As a bonus,
we now treat all cases within functions as being switch-like rather
than enum-like, which is better for recovery when not in a switch.

2018-04-05 16:35:14 -07:00

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