Pavel Yaskevich 985843a21f [ConstraintSystem] Add a new transitive conformance constraint ...

Conformance constraints could be transferred through conversions,
but that would also require checking implicit conversions
such as optional and pointer promotions for conformance is the
type itself doesn't conform, for that let's add a special constraint
`TransitivelyConformsTo`.

2021-04-07 17:55:11 -07:00

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