refactor[core]: Ast module is now Core

src/Language/Scalie/Core/Expression.hs

@@ -0,0 +1,23 @@
+{-# LANGUAGE Safe #-}
+{-# LANGUAGE InstanceSigs #-}
+module Language.Scalie.Core.Expression (Expression(..)) where
+
+import Prelude (Integer)
+import Data.Kind (Type)
+import Text.Show (Show)
+import Text.Read (Read)
+import Data.Eq (Eq)
+import Test.QuickCheck (Arbitrary (arbitrary), Gen, oneof)
+import Data.Functor ((<$>))
+
+type Expression :: Type
+data Expression
+  = RawInt Integer
+  deriving stock (Show, Read, Eq)
+
+instance Arbitrary Expression where
+  arbitrary :: Gen Expression
+  arbitrary = oneof
+    [ RawInt <$> arbitrary
+    ]
+