When the only change between two files is a COMMENT_INSERT, changedistiller can't detect that change.
Comment Insert is only detected when there is another change beside it.
For this particular test, the extra change is adding the "int c = 5;" statement in line 20.
When the only change between two files is a COMMENT_INSERT, changedistiller can't detect that change. Comment Insert is only detected when there is another change beside it. For this particular test, the extra change is adding the "int c = 5;" statement in line 20.