Don't allow instantiated ResultCaps to subsume anything #23890
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We map them to fresh caps but their hidden sets should not accept new elements.
Show the self type binder of a RecType only if the RecType was referred to in its body. This is needed so that we can add RecTypes to class types without polluting error messages.
The prefix is mapped as a normal type. It determines whether the hidden set allows to add new elements. ThisType and NoPrefix prefixes allow it, other prefixes forbid it.
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Have at most one FreshCap for a given prefix and hidden set.
We need to align RecTypes before comparing any wrapped CapturingTypes
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We map them to fresh caps but their hidden sets should not accept new elements.