Added version lower bounds to .cabal file. Added an import for compat…

…ibility to Binop.hs.

Elm.cabal

@@ -51,7 +51,8 @@ Executable elm
   Hs-Source-Dirs:      src, src/Parse, src/Types
 
   -- Packages needed in order to build this package.
-  Build-depends:       base, containers, transformers, mtl, parsec, blaze-html
+  Build-depends:       base >= 4.2.0.2, containers >= 0.3.0.0, transformers >= 0.2.2.0, mtl >= 1.1.0.2,
+                       parsec >= 3.1.1, blaze-html >= 0.4.1.6
 
   -- Modules not exported by this package.
   -- Other-modules:       
@@ -62,4 +63,5 @@ Executable elm
 Executable elm-server
   Main-is:             Server.hs
   Hs-Source-Dirs:      src, src/Parse, src/Types
-  Build-depends:       base, containers, transformers, mtl, blaze-html, HTTP, happstack-server
+  Build-depends:       base >= 4.2.0.2, containers >= 0.3.0.0, transformers >= 0.2.2.0, mtl >= 1.1.0.2,
+                       blaze-html >= 0.4.1.6, HTTP >= 4000.0.9, happstack-server >= 6.2.4

src/Parse/Binop.hs

@@ -3,6 +3,7 @@ module Binop (binops) where
 import Ast
 import Combinators
 import Control.Monad (liftM,guard)
+import Control.Monad.Error
 import Data.List (foldl',splitAt,elemIndices,group,groupBy,sortBy,find)
 import Data.Map as Map
 import Data.Maybe (mapMaybe)