get rid of set_vars class var in statement and define a wrapper for it, because it's still used
version should be the next one (with alpha) and not a past one, thx @ramiro
finally able to remove stmt.set_vars property
move also used_vars to a property, to show that it's not being written to
replace used_vars for params
remove one more used_vars usage
statements should care for its own docstrings, not the parser
simplified and united docstring version
remove last_token
remove more used_vars
it seems like all relevant used_vars usages have been removed
move some things from Flow to ForFlow
add a names_are_set_vars variable to statement
remove used_vars completely
removed used_vars and set_vars parameters, because they are unused