Added support for ‘$dotted.foreign.identifers’.
Very minor. Return expressions now return null.
	I'm worried that this might confuse a peep-hole TCO optimizer.
Wrote code to parse idenifiers of the “form var.a.b.c:method”.
unsyntax now works on S-expressions instead of on a basterdized IR.
	This eliminates a stupid special case in every IR-handling function.
Added support for fancy symbols with dots and colons.
Cleanup.
Added support for defining variables. Yucky code!