[5.1][ConstraintSystem] Replace special locator for return of single expr … #25409
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…function with a flag on contextual type locator It's only needed in one place in the constraint solver to allow `() -> T` to `() -> ()` and `() -> Never` to `() -> T` for expressions representing return of a single expression functions, so to simplify contextual type handling in diagnostic and other places it would be better to replace dedicated locator kind with a flag on existing `ContextualType`. Resolves: rdar://problem/51641323 (cherry picked from commit ba6a5e1)
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…function with a flag on contextual type locator
It's only needed in one place in the constraint solver to allow
() -> Tto() -> ()and() -> Neverto() -> Tfor expressionsrepresenting return of a single expression functions, so to simplify
contextual type handling in diagnostic and other places it would be
better to replace dedicated locator kind with a flag on existing
ContextualType.Resolves: rdar://problem/51641323
(cherry picked from commit ba6a5e1)