Doug Gregor eaee4add8a [GSB] Track all conformance constraint sources. ...

Move the storage for the protocols to which a particular potential
archetype conforms into EquivalenceClass, so that it is more easily
shared. More importantly, keep track of *all* of the constraint
sources that produced a particular conformance requirement, so we can
revisit them later, which provides a number of improvements:

* We can drop self-derived requirements at the end, once we've
  established all of the equivalence classes
* We diagnose redundant conformance requirements, e.g., "T: Sequence"
  is redundant if "T: Collection" is already specified.
* We can choose the best path when forming the conformance access
  path.

2017-03-16 23:15:37 -10:00

5.1 KiB

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