[5.0][CSBindings] Look through optional types when trying to validate l-va… #14489
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…lueness 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 (cherry picked from commit c6ff7b4)
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@swift-ci please smoke test and merge |
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…lueness 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
(cherry picked from commit c6ff7b4)