Expand Capability types T to T^ only if no explicit capture set is given #21375
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We now also use cap as the default for the self type's capture set if a base class has an explicit self type, but that type's capture set is universal. This requires fewer self type annotations.
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If C is a class extending caps.Capability we used to always expand C to C^, even if there was an explicitly given capture set. For instance
C^{x}got expanded toC^{cap}^{x}which caused a redundant capture x warning.We now do this expansion only if there is no explicitly given capture set.
@natsukagami I hope this helps the Async use case.