Using the "bind" operator

[my-scheme.git] / app / Main.hs

diff --git a/app/Main.hs b/app/Main.hs
index 58017c55305aa90095ba786e78ed009df4209040..88ae7f7ff2ff0b439dcb452d24c2be9a66e55e41 100644 (file)
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -34,7 +34,9 @@ parseAtom = do
                 _    -> Atom atom
 
 parseNumber :: Parser LispVal
-parseNumber = liftM (Number . read) $ many1 digit
+parseNumber = many1 digit >>= \ ds ->
+              let a = read ds
+              in return $ Number a
 
 parseExpr :: Parser LispVal
 parseExpr = parseString