debug: added debug functions for the syntactic_ast module
Modified the compiler executable to test a little bit.
todo: Some nodes of the syntactic ast are not yet emitted,
They do not need to be mutually recursive at all. At first I thought
they would have to be, because I thought it would be best if each phase
completely desugared the bodies of the expressions they handle, but now
I see that would probably lead to an infinite loop.
There is simply no reason to couple them so tightly.
