Allan Shortlidge 87308e37f1 AST: Avoid creating duplicate AvailabilityScopes under SequenceExprs. ...

Since availability scopes may be built at arbitrary times, the builder may
encounter ASTs where SequenceExprs still exist and have not been folded, or it
may encounter folded SequenceExprs that have not been removed from the AST.

To avoid a double visit, track whether a SequenceExpr is folded and then
customize how ASTVisitor handles folded sequences.

Resolves rdar://142824799 and https://github.com/swiftlang/swift/issues/78567.

2025-01-17 10:21:22 -08:00

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