I am working on the Trees that Grow stuff, and hit a small problem
I have
type family XIB x thing
type family XNewImplicitBndrs x thing
type ForallXImplicitBndrs (c :: * -> Constraint) (x :: *) (thing :: *) =
( c (XIB x thing)
, c (XNewImplicitBndrs x thing)
)
and I want to extend the DataId constraint
type DataId p =
( Data p
, ForallXImplicitBndrs Data p thing
)
But the problem is I do not have `thing` at this point, and to get it in
the code will involve some hs-boot nastiness.
Is there any way to require "forall thing. Data thing" inside the DataId
constraint?
Alan
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