Checks for indentation in continuation Lines

The following is valid µOCCAM. The program has continuation lines split at various levels of indentation, it should be accepted by the comiler.

-- program to test indentation in various cases
-- including continuations
SEQ
  channel ! (5 * 2)
  SEQ loop = 5 FOR 10
    VAL hello IS (3 +
                      4)
    SKIP
  VAL goodbye IS 5 *
                      2
  SKIP
  STOP