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Refactoring of extension methods in source packages (#78620) - take 2 (#78894)
Warn for multiple blank lines in source (#65451)
Store information about special attributes in the decl table to avoid going back to source unnecessarily. (#56402)
PropertySymbol.IsReadOnly/IsWriteOnly: use helpers that compiler uses itself to check for existence of a setter/getter (#82390)
Simplify sequence point display (#81104)