"Non-function top level binding unsupported"

[sweirich]

We can't say:

(x,y) = (True,False)

This occurs in PrelNames, but low priority. We probably want to manually axiomatize this module anyways. Just making the issue to mark this as an unsupported feature.

I'll push a new test case tests/TopBind.hs

[nomeata]

I guess since of my recent refactoring made that even harder, now that the types enforce that expressions are translated in the context of exactly one local function name. Maybe it could be relaxed to a list of functions.