[m-dev.] Type Unfolding Mark II

[Fergus Henderson]

Peter Schachte, you wrote:
> 
> Can't you just always unfold single-functor types?

On a related note, the compiler already unfolds single-functor
single-argument types, although it is done at at the data
representation level, rather than by source-to-source transformation.

Question: how will the debugger handle type unfolding??

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