From what I remember, variable references started with a dollar sign and you'd need to apply a new level of escaping (another dollar sign) to variable names wit

From what I remember, variable references started with a dollar sign and you'd need to apply a new level of escaping (another dollar sign) to variable names with each inner loop, otherwise the variables would be substituted once and kept for all loop iterations. You can sometimes see similar issues in shell scripts, the following command prints three empty lines instead of numbers: sh -c "for i in 1 2 3; do echo $i; done" There were countless other restrictions too, some expressions could only take a variable name. Statements were delimited by lines (and optionally also by semicolons) so any loop or conditional, regardless of nesting depth, had to fit inside a single line. Due to usage of string.split, initially all semicolons had to have a space before them, I remember feeling very smart when I added automatic splitting of "abc;" into two tokens "abc" and ";"