Random refinement.  We need to think about names.
Refactor.

--HG--
rename : src/tamsin/codegen.py => src/tamsin/codenode.py
Keep on truckin'
Falling asleep at the wheel
The stars are out.  I feel sorry for them
Have another one, oh I couldn't possibly, well OK.
Keep on truckin'... space truckin'.
That's just super.