The following is an invalid µOCCAM program.
/public/cs3/web/ipptests/superinvalid.reject
INT x: PAR SEQ stdin ! x --huh?! ?!?!?! stdout ? x SEQ stdin ? y --emmm, i see, y is an undeclared variable stdout ! y SEQ INT zzzz = bedtime --bad assignment and : missing SEQ INT a: --the lone survivor stdin ? a stdout ! a z := ops --bad assignment and out of scope Good luck! --this is an invalid comment