+tidyWorker tidy_env show_unfold (HasWorker work_id wrap_arity)
+ | show_unfold = HasWorker (tidyVarOcc tidy_env work_id) wrap_arity
+ | otherwise = WARN( True, ppr work_id ) NoWorker
+ -- NB: do *not* expose the worker if show_unfold is off,
+ -- because that means this thing is a loop breaker or
+ -- marked NOINLINE or something like that
+ -- This is important: if you expose the worker for a loop-breaker
+ -- then you can make the simplifier go into an infinite loop, because
+ -- in effect the unfolding is exposed. See Trac #1709
+ --
+ -- Mind you, it probably should not be w/w'd in the first place;
+ -- hence the WARN