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Fri Dec 30 08:36:31 EST 2011

SArray has no 'a' param

Continuation of last post.  Basically, I don't quite understand why it
doesn't infer, but I guess this is because too much information is
lost in the SArray class. 

    (L (a t1)), L (a t2))   <->   a (L t1, L t2)

Is it possible to do this somewhere else, implementing the isomorphism
in terms of a substrate, i.e. "fake struct array".

I.e. the isomorphism would map "struct of array" to "array of struct"
only on the type level.  The implementation would then do the wrapping
such that these 2 cases can be distinguished.

It feels a bit messy though, but I see no way to make this isomorphism
work without somehow rooting it in representation.

Alternatively, would it be possible to add a fake method to Loop class
that exposes the array parameter?



Ok, I tried for a bit and it's too opaque.  I just don't understand
it.  All I do is fiddling to see what the checker says... Let's go for
something simpler.

Conclusions:

 * I can't get the translation _get' -> multiple _get to work on the
   typed level due to inference errors.

 * It might be simpler to solve it in Term, I.e. allow a
   representation of a struct (which would normally be only one Ref)
   to be a RefList.  This is possibly simpler to understand.




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