Doug Gregor 37959de29e Establish type refinement contexts for pattern binding decls directly ...

The type refinement context builder had a bunch of logic to try to
model type refinement contexts for the first variable declaration that
shows up within a pattern binding declaration. Instead, model this
more syntactically by creating a type refinement context for the
pattern binding declaration itself. This both addresses a regression
in the handling of `if #available` within a closure that's part of an
initializer, and fixes a bug in the same area where similar code has
explicit availability annotations.

2023-08-02 15:07:09 -07:00

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