Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/include/NonStdEval.hi
interface NonStdEval where { interface ! NonStdEval {-# NEED evaluating #-} evaluating{-# 1 #-}::(a -> Prelude.Bool); {-# NEED evaluated #-} evaluated{-# 1 #-}::(a -> Prelude.Bool); }