Let bindings within the body of a fact

[marick]

Right now (0.4), this doesn't work:

(fact (let [a 5] (f a) => 2))

Bindings are honored but they have to be made outside the body of the fact. More generally, only the top level of the forms within fact are explored and transformed into semi-sweet forms. I'm undecided if that's good or bad. Probably bad.

[marick]

Fixed.