Introduce if/switch expressions#63022

Merged

hamishknight merged 8 commits intoswiftlang:mainfrom

hamishknight:express-yourself

Feb 3, 2023

Commits on Feb 1, 2023

[AST] Expand TypeJoin expression to support joining over a type

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[CSClosure] Allocate temporary type-join and opaque value exprs in solver arena

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[Sema] Avoid forming double braced single expression closures
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[CS] NFC: Factor out brace element handling in a couple of cases
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[CS] NFC: Move SolverSnapshot::applySolution into the cpp file
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[Sema] Introduce PreCheckReturnStmtRequest
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Introduce if/switch expressions
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[Sema] Error on redundant try/awaits for if/switch expressions
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