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diff --git a/src/include/Lisp.H b/src/include/Lisp.H
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-// Copyright (C) 2013-2014, Gabriel Dos Reis.
-// All rights reserved.
-// Written by Gabriel Dos Reis.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     - Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//
-//     - Redistributions in binary form must reproduce the above copyright
-//       notice, this list of conditions and the following disclaimer in
-//       the documentation and/or other materials provided with the
-//       distribution.
-//
-//     - Neither the name of OpenAxiom nor the names of its contributors
-//       may be used to endorse or promote products derived from this
-//       software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
-// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// --% Author: Gabriel Dos Reis
-// --% Abstract:
-// --%    Very simple support for some core Lisp-like operations.
-
-#ifndef OPENAXIOM_LISP_included
-#define OPENAXIOM_LISP_included
-
-#include <list>
-#include <open-axiom/sexpr>
-#include <open-axiom/vm>
-#include <map>
-#include <open-axiom/diagnostics>
-#include <iosfwd>
-#include <unordered_set>
-
-namespace std {
-   template<>
-   struct hash<OpenAxiom::VM::Package>  {
-      hash<OpenAxiom::VM::String>::result_type
-      operator()(const OpenAxiom::VM::Package& s) const {
-         return h(s.name);
-      }
-      hash<OpenAxiom::VM::String> h;
-   };
-
-   template<>
-   struct equal_to<OpenAxiom::VM::Package> {
-      using arg_type = OpenAxiom::VM::Package;
-      bool operator()(const arg_type& x, const arg_type& y) const {
-         constexpr equal_to<OpenAxiom::VM::String> eq { };
-         return eq(x.name, y.name);
-      }
-   };
-}
-
-namespace OpenAxiom {
-   namespace Lisp {
-      using namespace VM;
-
-      // -- Unimplemented features
-      struct Unimplemented : Diagnostics::BasicError {
-         explicit Unimplemented(const std::string&);
-      };
-
-      // -- Integer overflow
-      struct IntegerOverflow : Diagnostics::BasicError {
-         explicit IntegerOverflow(const std::string&);
-      };
-
-      // -- Unbound symbol
-      struct UnboundSymbol : Diagnostics::BasicError {
-         explicit UnboundSymbol(const std::string&);
-      };
-
-      // -- Unbound functiom symbol
-      struct UnboundFunctionSymbol : Diagnostics::BasicError {
-         explicit UnboundFunctionSymbol(const std::string&);
-      };
-      
-      // -- Anchor maps
-      using AnchorTable = std::map<Ordinal, Value>;
-
-      // -- Evaluator --
-      struct Evaluator : VM::BasicContext {
-         Evaluator();
-         Value eval(const Sexpr::Syntax*);
-         Package* core_package() { return core; }
-         Package* current_package() { return ns; }
-         Value toplevel_form(const Sexpr::Syntax*);
-         Value make_value(const Sexpr::Syntax*);
-         Value* lexical_binding(String);
-         Environment* global_environment();
-      private:
-         Package* core;
-         Package* ns;
-         Symbol* feature_list;
-         std::list<Environment> env_stack;
-         AnchorTable anchor_map;
-      };
-
-      // -- Format a value onto an output stream.
-      void format(Value, std::ostream&);
-      std::string show(Value);
-
-      // -- Retracts
-      Fixnum retract_to_fixnum(Value);
-      Pair retract_to_pair(Value);
-      Symbol* retract_to_symbol(Value);
-
-      // -- Alist functions
-      Value assoc(Value, Pair);
-   }
-}
-
-#endif  // OPENAXIOM_LISP_included
-