Feature Request for 2.0: A way to implement MRV

[Downs]

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I don't think this much-longed-for feature (returning tuples) has been
mentioned at DCon, and although I believe it would
be highly useful, I realize it might be too hard to implement (though I
can't exactly see how, if a half-working surrogate can be whipped up
with half a page of 1.0 code).
However, there is an easier way to achieve something sufficiently close
as to be indistuingishable from "real" MRV. This way entails two closely
related features:

First, the redefinition of the comma operator to combine variables into
a new type of tuple: a variable tuple, that being a set of variables
combined under a common name, that a tuple can be assigned to.

Second, and probably more important, the ability to implicit cast a
struct to a tuple.

This would allow us to extend the current solution of returning a
TupleStruct to implicitly assigning that tuple struct to a group of
variables without needing to store their pointers separately, as is
currently done.

Thanks for your consideration.
- --downs
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