object unlifters
Full support for unliftable implies that it's possible to interleave deconstruction with higher rank and unlifting of the values. In particular extraction of List[Tree] as List[T: Unliftable] requires helper extractors that would do the job: UnliftListElementwise[T]. Similarly List[List[Tree]] needs UnliftListOfListsElementwise[T].
See also "unlift list" tests in UnapplyProps.scala
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- Holes.scala
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