Feature specification of #3090, allowing an inline class to implement its representation type #3138
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… class which is sealed/base/final
…erface graph with different type arguments
… more than normal classes can do)
This was referenced Jun 30, 2023
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Note that the proposal in this PR is included in the proposal about extension types, #3182. |
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Closing: This feature has been included in the 'extension types' feature specification, so there's no need to have a separate feature specification (which is what this PR will add). |
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This PR contains a proposal for an addendum to the feature specification of inline classes, specifying how we could support the situation where an inline class
Vhas animplements ... Rclause whereRis the representation type (or any supertype thereof).The point is that this provides (1) the subtype relationship
V <: R, and (2) a receiver of typeVcan have members ofRinvoked on it.In this proposal,
Vis allowed to redeclare members ofR(which means thatV"overrides" the implementation of that member, albeit with static dispatch only).Conflict resolution is specified to be the same as it has always been for superinterfaces: If both
Rand some other superinterface have a member with the same name then there is an error, butVcan redeclare the member and that will resolve the conflict.