Robert Widmann 2966a38ee1 Do a little extra validation of RawRepresentable.RawValue ...

* In the DeclChecker, duplicate the check that we have a reasonable
RawValue type so we do not attempt to form an invalid key. The interface
to the autoincrementer has this as invariant, but it was not previously
checked as a precondition.

* In the deriver, try to check for the case where the user has written
a mismatched explicit declaration of RawValue, or a type sharing that
name, and check type equality with the declared raw type to make this
pass resilient to mismatches as well.

Resolves rdar://57072148, rdar://59703784

2020-03-16 09:59:09 -07:00

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