[polyml] Debugging : breakAt

Hi, suppose that I have the following code ("basics.ml") :

******************************** (* basics.ml *)

fun is_divisible(n : int, currentDivisor : int) = if currentDivisor <= n - 1 then n mod currentDivisor = 0 orelse is_divisible(n, currentDivisor + 1) else false; (* This is line 9 *)

fun is_prime(n : int) : bool = if n = 2 then true else not(is_divisible(n, 2)); ********************************

Then if I do :

rlwrap poly PolyML.Compiler.debug := true; use "basics.ml"; open PolyML.Debug; breakAt("basics.ml",9); is_prime(15);

then I am finding that the debugger is not stopping at the desired line. Is there anything that I am doing wrong? (I am using the latest compiler sources from github). Thanks