1 files changed, 5 insertions, 5 deletions
diff --git a/Main.hs b/Main.hs
index b56edfe..ef98b62 100644
--- a/Main.hs
+++ b/Main.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE LambdaCase, TupleSections #-}
 module Main where
 
 import System.Environment
@@ -16,13 +17,12 @@ usage = do
 
 main :: IO ()
 main = do
-    clargs <- getArgs
-    source <- case clargs of
-        [] -> getContents
-        [fname] -> readFile fname
+    (mfname, source) <- getArgs >>= \case
+        [] -> (Nothing,) <$> getContents
+        [arg] -> (Just arg,) <$> readFile arg
         _ -> usage >> exitFailure
 
-    prog <- parseProgram source >>= either (die . show) return
+    prog <- parseProgram mfname source >>= either (die . show) return
     irprog <- either die return (compileProgram prog)
     let opt = optimise irprog
     -- print opt