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Run 'make struct readonly' on compiler code (#63675)
Add support for `with(...)` elements in collection expressions. (#80495)
Add C# 15 language version (#84799)
Conversions from sbyte or short to nuint require explicit cast (#50836)
Initial support for Unions conversions (#81586)
Use attribute to designate Union types (#82408)
Unions: Address/remove some PROTOTYPE comments (#82381)
Support modifiers with simple lambda parameters. (#75400)
Collection expression conversions: check elements are convertible
Enable consumption of user-defined conversion operators declared in interfaces. (#53619)
Adjust spec quotes in ConversionBase.AddTypesParticipatingInUserDefinedConversion to incorporate abstract statics in interfaces (#62076)
Reduce work in ConversionsBase.AddUserDefinedConversionsToExplicitCandidateSet (#76835)
Unions: cache some calculated results on NamedTypeSymbol representing a union type (#84589)