Now procedure applications are represented as lists

src/Evaluator.hs

@@ -14,13 +14,13 @@ base = M.fromList [
   ]
 
 eval :: Env -> Expr -> (Env, Expr)
-eval env i@(IntE x)    = (env, i)
+eval env i@(IntE _)    = (env, i)
 eval env (VarE v)      = (M.insert v nExpr nEnv, nExpr)
   where (nEnv, nExpr)  = eval env $ env M.! v
 eval env (SetE v expr) = (M.insert v expr env, NilE)
 eval env (QuotedE e)    = (env, e)
-eval env c@(ConsE _ _) = (env, c)
+eval env (ConsE car cdr) = (env, apply car cdr)
 eval env NilE          = (env, NilE)
 
---apply :: Proc -> Args -> Expr
---apply p args
+apply :: Expr -> Expr -> Expr
+apply car cdr = undefined

src/ExprType.hs

@@ -2,7 +2,6 @@ module ExprType where
 
 data Expr = IntE Integer
           | VarE String
-          | ProcedureE String [Expr]
           | SetE String Expr
           | ConsE Expr Expr
           | QuotedE Expr

src/Parser.hs

@@ -20,9 +20,18 @@ expressionFromTokensEOF = do
 
 expressionFromTokens :: GenParser Token st Expr
 expressionFromTokens = do
-  expr <- intE <|> quotedE <|> try setE <|> try nilE <|> try consE <|> varE <|> procedureE
+  expr <- intE <|> quotedE <|> try setE <|> try nilE <|> try consE <|> varE <|> listE
   return expr
 
+listE :: GenParser Token st Expr
+listE = do
+  _ <- parseLeftParenT
+  exprs <- many expressionFromTokens
+  _ <- parseRightParenT
+  return $ toCons exprs
+  where toCons []     = NilE
+        toCons (x:xs) = ConsE x (toCons xs)
+
 intE :: GenParser Token st Expr
 intE = do
     (IntT num) <- parseIntT
@@ -34,14 +43,6 @@ quotedE = do
   expr <- expressionFromTokens
   return $ QuotedE expr
 
-procedureE :: GenParser Token st Expr
-procedureE = do
-  _ <- parseLeftParenT
-  (SymbolT p) <- parseSymbolT
-  args <- many expressionFromTokens
-  _ <- parseRightParenT
-  return $ ProcedureE p args
-
 consE :: GenParser Token st Expr
 consE = do
   _ <- parseLeftParenT