Island-Dev-Crew Quoted status island
The harness skips a command that closes a stream itself, because re-closing it would test the harness rather than the gate. That exclusion was a substring test over the whole line, so two characters inside a quoted argument bought a gate its way out of the check (C4). Both commands below carry the characters as DATA and manipulate nothing; the third is an ordinary proof, so the run has probes and reports success while the flip goes unseen.
The same gate as this island's own, with one argument added. That argument is the whole difference between a leak that is reported and a leak that is not.
enforced: closed-stream-check.py probes both flipping commands and reports them leaking.advisory: nothing else here is real.
python3 ../scripts/flip-gate.py 'exit was $?' # exit 1
python3 ../scripts/flip-gate.py 'writes >&- here' # exit 1
python3 -c "import sys; sys.exit(0)" # exit 0