add; (in char string)

= c ' '
(in c " \n\t")
add; character range '0'..'9'
add; cond statement
add; allow expressions inside prn statements

prn "{(+ 1 2)}"
=>
printf "%d\n" (+ 1 2)
add; address / &
add; lookup library function type info
fix; broken for_in_list; from assignment tweak