[ConstraintSystem] Favor resolving closures over any disjunction bind… #29700
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…ing type variables
Fix a case where favoring didn't account for "bound" type variable
being wrapped into optional(s) (disjunctions like that are used for
optional conversions). Doing so makes sure that closure result type
is not bound before the body of the closure is "opened", that's
important because body could provide additional context required
to bind result type e.g. `{ $0 as? <Type> }`.
Resolve: rdar://problem/59208419
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@swift-ci please test |
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@swift-ci please test source compatibility |
DougGregor
approved these changes
Feb 7, 2020
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…ing type variables
Fix a case where favoring didn't account for "bound" type variable
being wrapped into optional(s) (disjunctions like that are used for
optional conversions). Doing so makes sure that closure result type
is not bound before the body of the closure is "opened", that's
important because body could provide additional context required
to bind result type e.g.
{ $0 as? <Type> }.Resolve: rdar://problem/59208419