Amazing!

Right. I've got rudimentary interactive mode support.

>> "hello world"
""hello world""

Amazing how many small bugs one can code.

>> if System.true then 1 else 2
if System.true then 1 else 2
Segmentation fault (core dumped)

Not to worry. The first is because I haven't completely implemented escape/unescape routines, the second probably because I massage terms in the wrong order in interactive mode.