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Callouts using co:

  |(let ①loopvar ②((count 1))
  |  ③(if (> count 10)
  |    ④#t
  |    (⑤loopvar ⑥(+ count 1))))
①

This variable controls the loop. It is declared without an initial value, immediately after the let operand.

②

Any number of additional local variables can be defined after the loop variable, just as they can in any other let expression.

③

If you ever want the loop to end, you have to put some sort of a test in it.

④

This is the value that will be returned.

⑤

Note that you iterate the loop by using the loop variable as if it was a function name.

⑥

The arguments to this function are the values that you want the local variables declared in ② to have in the next iteration.