Module demo.interop.sumdemo.

Rule sumInt, produce:
  Return Interop.sum(1, 2).

Rule sumLong, produce:
  Return Interop.sum(1L, 2L).

Rule sumDouble, produce:
  Return Interop.sum(1.0, 2.0).

Rule sumIntLong, produce:
  Return Interop.sum(1, 2L).

Rule sumIntDouble, produce:
  Return Interop.sum(1, 2.0).