{-
   Copyright 2016, Dominic Orchard, Andrew Rice, Mistral Contrastin, Matthew Danish

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
-}
{-# LANGUAGE GADTs, EmptyDataDecls, DataKinds, KindSignatures, ExistentialQuantification #-}

data Version = F77 | F90

data AST (v :: Version) where
    Assign :: String -> AST F77
    Module :: String -> Int -> AST F90
        
data TopLevel = forall v . AST v