c-style for loops are turned into the single loop kind,
with the initializer and the iteration step statements synthesized into
statements within the block.

<<<

main = fun () {
    for i int = 0, i < 10, i++ {
        var x int = i
    }
}

>>>

(unit
	(types
		(type 0 int primitive)
		(type 1 uint primitive)
		(type 2 bool primitive)
		(type 3 string primitive)
		(type 4 float primitive)
		(type 5 byte primitive)
		(type 6 ascii primitive)
		(type 7 void primitive))
	(functions
		(function 0 main main (returns (ref void)) (block
			(block
				(declaration i (ref int) (initializer (expr 0)))
				(loop (condition (expr (binary < (expr (name i)) (expr 10)))) (block
					(declaration x (ref int) (initializer (expr (name i))))
					(expression-stmt (expr (postfix-++ (expr (name i)))))
				))
			)
		)))
	(emission_order 0 1 2 3 4 5 6 7))