/* Debug test for function call evaluation */
is_even : n -> n % 2 = 0;

test_debug : n ->
  when is_even n is
    true then "even"
    false then "odd";

/* Test the function call separately */
result1 : is_even 4;
result2 : is_even 5;

/* Test with explicit boolean comparison */
test_explicit : n ->
  when (is_even n = true) is
    true then "even"
    false then "odd";

result3 : test_explicit 4;
..out result1;
..out result2;
..out result3;