[5.9] Fix covariant erasure for constrained existential #66017
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Constrained existentials should be type erased to an upper bound that is dependent on other type parameters.
Opened existentials should be erased to the dependent upper bound if the dependent member can be reduced to a concrete type. This allows the generic signature to support parameterized protocol types and bound generic class types by producing a more specific constraint instead of just a plain protocol or class.
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@swift-ci please test |
angela-laar
changed the title
hborla
approved these changes
May 19, 2023
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if the dependent member can be reduced to a concrete type. This
allows the generic signature to support parameterized protocol types
and bound generic class types by producing a more specific constraint.