-- Loops: wh (while), @i a..b (range), brk (break), cnt (continue).
-- Loop control flow: brk exits, cnt skips to next iteration.
-- Braced guards cond{body} inside loops are conditional execution (no early return).
-- Braceless guards cond expr still cause early function return.
-- While loop: sum 1 through 5
wh-sum>n;i=0;s=0;wh <i 5{i=+i 1;s=+s i};+s 0
-- Range iteration: sum 0+1+2+3+4
range-sum>n;s=0;@i 0..5{s=+s i};+s 0
-- Range: collect indices into a list
range-list>L n;xs=[];@i 0..4{xs=+=xs i};xs
-- Break: exit loop when i reaches 3
brk-at-3>n;i=0;wh true{i=+i 1;>=i 3{brk}{i=i}};+i 0
-- Continue: sum only even numbers 0..6 (skip odd)
cnt-evens>n;s=0;@i 0..7{r=mod i 2;!=r 0{cnt}{s=+s i}};+s 0
-- run: wh-sum
-- out: 15
-- run: range-sum
-- out: 10
-- run: range-list
-- out: [0, 1, 2, 3]
-- run: brk-at-3
-- out: 3
-- run: cnt-evens
-- out: 12