--halt-at-warn
--warn-dead-preds
--warn-implicit-stream-calls
--warn-inconsistent-pred-order-clauses
--warn-insts-with-functors-without-type
--warn-known-bad-format-calls
--warn-non-contiguous-clauses
--warn-non-contiguous-foreign-procs
--warn-potentially-ambiguous-pragma
--warn-suspicious-foreign-code
--warn-unknown-format-calls
--warn-unused-imports