Unpacking single-field, single-strict-constructor GADTs and existentials

[Ben Gamari]

Ben Gamari <ben at well-typed.com> writes:

snip

> As far as I understand as long as the existentially-quantified argument
> is unconstrained (therefore there is no need to carry a dictionary) and
> of kind * (therefore has a uniform representation) there is no reason
> why unpacking shouldn't be possible.
>
To clarify, as pointed out in #10016 it should also be possible to
unpack in the constrained case. You merely need to retain a spot in the
datacon's representation to place the dictionary.

I hope this helps.

Cheers,

- Ben
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