Pavel Yaskevich c6ff7b40cc [CSBindings] Look through optional types when trying to validate l-valueness of the new bindings ...

When bindings are picked for particular type variable, right-hand
side of the binding might be another type variable wrapped into optional
type, when trying to determine if both sides of the binding have the
same l-valueness it's imperative to look throught optional type of the
right-hand side. Otherwise new binding might be effectively unsolvable.

Resolves: rdar://problem/37291371

2018-02-08 01:55:39 -08:00

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