| BuildError !SrcLoc !SDoc
| EOF
-showOpt :: Option -> String
-showOpt (FileOption pre f) = pre ++ f
-showOpt (Option s) = s
-
traceCmd :: DynFlags -> String -> String -> IO () -> IO ()
-- a) trace the command (at two levels of verbosity)
-- b) don't do it at all if dry-run is set