Doug Gregor 8ad137fb51 [Typed throws] Infer thrown error type for do..catch blocks within closures. ...

Start classifying all potential throw sites within a constraint
system and associate them with the nearest enclosing catch node. Then,
determine the thrown error type for a given catch node by taking the
union of the thrown errors at each potential throw site. Use this to
compute the error type thrown from the body of a `do..catch` block
within a closure.

This behavior is limited to the upcoming feature `FullTypedThrows`.

2023-12-13 14:59:23 -08:00

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