[project @ 2003-11-10 12:04:25 by simonpj]

Better error message for ghc --show-iface, with no file supplied

ghc/compiler/main/DriverFlags.hs

@@ -93,7 +93,7 @@ processOneArg action rest (dash_arg@('-':arg):args) =
 		if rest /= "" 
 			then fio rest >> return args
 			else case args of
-				[] -> unknownFlagErr dash_arg
+				[] -> missingArgErr dash_arg
 				(arg1:args1) -> fio arg1 >> return args1
 
 	SepArg fio -> 

ghc/compiler/main/DriverUtil.hs

 -----------------------------------------------------------------------------
--- $Id: DriverUtil.hs,v 1.39 2003/08/20 15:07:57 simonmar Exp $
+-- $Id: DriverUtil.hs,v 1.40 2003/11/10 12:04:25 simonpj Exp $
 --
 -- Utils for the driver
 --
@@ -101,6 +101,9 @@ unknownFlagErr f = throwDyn (UsageError ("unrecognised flag: " ++ f))
 unknownFlagsErr :: [String] -> a
 unknownFlagsErr fs = throwDyn (UsageError ("unrecognised flags: " ++ unwords fs))
 
+missingArgErr :: String -> a
+missingArgErr f = throwDyn (UsageError ("missing argument for flag: " ++ f))
+
 my_partition :: (a -> Maybe b) -> [a] -> ([(a,b)],[a])
 my_partition _ [] = ([],[])
 my_partition p (a:as)