Pavel Yaskevich 23ace7d770 [ConstraintSystem] Store declaration context in which application occurs in ApplicableFunction constraint ...

This is required because `ApplicableFunction` constraint can
inject member reference constraints that require a declaration
context.

For example, `_ = { Double(...) }` would now produce a disjunction
for `Double.init` where overload choice declaration contexts point
to the closure instead of the enclosing context.

This addresses a long-standing FIXME in `simplifyApplicableFnConstraint`
and helps with disjunction optimizer because its correctness depends on
correct identification of declaration contexts where applications happen.

2025-02-09 15:46:44 -08:00

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