+ return $ VBool $ if (read s == 0) then False else True
+eval (EFunc i as) = do
+ vs <- mapM eval as
+ state <- get
+ (ds,ss) <- lookup i $ functions state
+ let m = foldr (\((Decl t i),v) m -> insert i v m) empty $ zip ds vs
+ in modify (\s -> s{variables=[m]})
+ mapM_ execute ss `catchError` (\_ -> return ())
+ v <- lift $ takeMVar $ ret state
+ put state
+ return v