Fix async return handling #92
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JustusAdam
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Fixes the parent-to-child translation of async functions.
The prior code assumed that the type of the destination place an async function returns from is the same as the type of
_0in the child. However it is insteadPoll<...>. This adds the requisite projections to the destination place to make this work out. In particular it adds aDowncast(becausePollis an enum and theReadyvariant is the one that carries the actual result) and aFieldprojection (because a variant downcast is always followed by a projection onto one of the fields).I also refactored
translate_to_parentslightly so it is just one match statement. I think that is clearer.We should probably add some test cases for this but I've verified that this works in the Paralegal tests.