GHC stops after a single 'defined but not used' warning
-Wall -Werror, GHC stops after finding a single "defined but not used" warning:
cmm/ZDF3.hs:795:10: Warning: Defined but not used: `rew_CO'
I'm sweeping away old code and would much prefer that GHC find all the defined-but-not-used identifiers on a single run. The transitive closure would be ideal, but I would settle for just all the ones that are defined but not used.