expand while body under 'while' context
let bind 'while' transform vars
tests for 'break' and 'continue'
update
transform table 'for-macro'
variable for debugging
tests for 'for' loop
proper tests for augmented assignment
fix 'for' transform
addition tests
subtraction tests
function: `pyel-mul-num-str'
fix
multiplication tests
fix
pow tests
fix
more tests
sometimes useful
fix 'fcall' transform