Doug Gregor bdc961d8c6 [Constraint solver] Do argument label matching during apply simplification. ...

When simplifying a function application constraint, check the argument
labels for that application against the disjunction containing the overload
set, disabling any overloads with mis-matching labels. This is staging for
several different directions:

* Eliminating the argument label matching from performMemberLookup, where it
does not belong
* More aggressively filtering the overload set when we have some concrete
information about argument types
* Identifying favored constraints when we have some concrete information
about argument types

At present, the only easily-visible effect of this change is that
we now properly handle argument label matching for non-member functions.

2019-02-28 23:53:08 -08:00

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