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diff --git a/Solvers/dreal4/bazel-bin/dreal/dr/parser.yy.hh b/Solvers/dreal4/bazel-bin/dreal/dr/parser.yy.hh
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@@ -0,0 +1,1793 @@
+// A Bison parser, made by GNU Bison 3.5.
+
+// Skeleton interface for Bison LALR(1) parsers in C++
+
+// Copyright (C) 2002-2015, 2018-2019 Free Software Foundation, Inc.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+// As a special exception, you may create a larger work that contains
+// part or all of the Bison parser skeleton and distribute that work
+// under terms of your choice, so long as that work isn't itself a
+// parser generator using the skeleton or a modified version thereof
+// as a parser skeleton.  Alternatively, if you modify or redistribute
+// the parser skeleton itself, you may (at your option) remove this
+// special exception, which will cause the skeleton and the resulting
+// Bison output files to be licensed under the GNU General Public
+// License without this special exception.
+
+// This special exception was added by the Free Software Foundation in
+// version 2.2 of Bison.
+
+
+/**
+ ** \file bazel-out/k8-opt/bin/dreal/dr/parser.yy.hh
+ ** Define the dreal::parser class.
+ */
+
+// C++ LALR(1) parser skeleton written by Akim Demaille.
+
+// Undocumented macros, especially those whose name start with YY_,
+// are private implementation details.  Do not rely on them.
+
+#ifndef YY_DREAL_BAZEL_OUT_K8_OPT_BIN_DREAL_DR_PARSER_YY_HH_INCLUDED
+# define YY_DREAL_BAZEL_OUT_K8_OPT_BIN_DREAL_DR_PARSER_YY_HH_INCLUDED
+
+
+# include <cstdlib> // std::abort
+# include <iostream>
+# include <stdexcept>
+# include <string>
+# include <vector>
+
+#if defined __cplusplus
+# define YY_CPLUSPLUS __cplusplus
+#else
+# define YY_CPLUSPLUS 199711L
+#endif
+
+// Support move semantics when possible.
+#if 201103L <= YY_CPLUSPLUS
+# define YY_MOVE           std::move
+# define YY_MOVE_OR_COPY   move
+# define YY_MOVE_REF(Type) Type&&
+# define YY_RVREF(Type)    Type&&
+# define YY_COPY(Type)     Type
+#else
+# define YY_MOVE
+# define YY_MOVE_OR_COPY   copy
+# define YY_MOVE_REF(Type) Type&
+# define YY_RVREF(Type)    const Type&
+# define YY_COPY(Type)     const Type&
+#endif
+
+// Support noexcept when possible.
+#if 201103L <= YY_CPLUSPLUS
+# define YY_NOEXCEPT noexcept
+# define YY_NOTHROW
+#else
+# define YY_NOEXCEPT
+# define YY_NOTHROW throw ()
+#endif
+
+// Support constexpr when possible.
+#if 201703 <= YY_CPLUSPLUS
+# define YY_CONSTEXPR constexpr
+#else
+# define YY_CONSTEXPR
+#endif
+# include "location.hh"
+
+#ifndef YY_ASSERT
+# include <cassert>
+# define YY_ASSERT assert
+#endif
+
+
+#ifndef YY_ATTRIBUTE_PURE
+# if defined __GNUC__ && 2 < __GNUC__ + (96 <= __GNUC_MINOR__)
+#  define YY_ATTRIBUTE_PURE __attribute__ ((__pure__))
+# else
+#  define YY_ATTRIBUTE_PURE
+# endif
+#endif
+
+#ifndef YY_ATTRIBUTE_UNUSED
+# if defined __GNUC__ && 2 < __GNUC__ + (7 <= __GNUC_MINOR__)
+#  define YY_ATTRIBUTE_UNUSED __attribute__ ((__unused__))
+# else
+#  define YY_ATTRIBUTE_UNUSED
+# endif
+#endif
+
+/* Suppress unused-variable warnings by "using" E.  */
+#if ! defined lint || defined __GNUC__
+# define YYUSE(E) ((void) (E))
+#else
+# define YYUSE(E) /* empty */
+#endif
+
+#if defined __GNUC__ && ! defined __ICC && 407 <= __GNUC__ * 100 + __GNUC_MINOR__
+/* Suppress an incorrect diagnostic about yylval being uninitialized.  */
+# define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN                            \
+    _Pragma ("GCC diagnostic push")                                     \
+    _Pragma ("GCC diagnostic ignored \"-Wuninitialized\"")              \
+    _Pragma ("GCC diagnostic ignored \"-Wmaybe-uninitialized\"")
+# define YY_IGNORE_MAYBE_UNINITIALIZED_END      \
+    _Pragma ("GCC diagnostic pop")
+#else
+# define YY_INITIAL_VALUE(Value) Value
+#endif
+#ifndef YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
+# define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
+# define YY_IGNORE_MAYBE_UNINITIALIZED_END
+#endif
+#ifndef YY_INITIAL_VALUE
+# define YY_INITIAL_VALUE(Value) /* Nothing. */
+#endif
+
+#if defined __cplusplus && defined __GNUC__ && ! defined __ICC && 6 <= __GNUC__
+# define YY_IGNORE_USELESS_CAST_BEGIN                          \
+    _Pragma ("GCC diagnostic push")                            \
+    _Pragma ("GCC diagnostic ignored \"-Wuseless-cast\"")
+# define YY_IGNORE_USELESS_CAST_END            \
+    _Pragma ("GCC diagnostic pop")
+#endif
+#ifndef YY_IGNORE_USELESS_CAST_BEGIN
+# define YY_IGNORE_USELESS_CAST_BEGIN
+# define YY_IGNORE_USELESS_CAST_END
+#endif
+
+# ifndef YY_CAST
+#  ifdef __cplusplus
+#   define YY_CAST(Type, Val) static_cast<Type> (Val)
+#   define YY_REINTERPRET_CAST(Type, Val) reinterpret_cast<Type> (Val)
+#  else
+#   define YY_CAST(Type, Val) ((Type) (Val))
+#   define YY_REINTERPRET_CAST(Type, Val) ((Type) (Val))
+#  endif
+# endif
+# ifndef YY_NULLPTR
+#  if defined __cplusplus
+#   if 201103L <= __cplusplus
+#    define YY_NULLPTR nullptr
+#   else
+#    define YY_NULLPTR 0
+#   endif
+#  else
+#   define YY_NULLPTR ((void*)0)
+#  endif
+# endif
+
+/* Debug traces.  */
+#ifndef DREALDEBUG
+# if defined YYDEBUG
+#if YYDEBUG
+#   define DREALDEBUG 1
+#  else
+#   define DREALDEBUG 0
+#  endif
+# else /* ! defined YYDEBUG */
+#  define DREALDEBUG 1
+# endif /* ! defined YYDEBUG */
+#endif  /* ! defined DREALDEBUG */
+
+namespace dreal {
+#line 188 "bazel-out/k8-opt/bin/dreal/dr/parser.yy.hh"
+
+
+
+
+  /// A Bison parser.
+  class DrParser
+  {
+  public:
+#ifndef DREALSTYPE
+  /// A buffer to store and retrieve objects.
+  ///
+  /// Sort of a variant, but does not keep track of the nature
+  /// of the stored data, since that knowledge is available
+  /// via the current parser state.
+  class semantic_type
+  {
+  public:
+    /// Type of *this.
+    typedef semantic_type self_type;
+
+    /// Empty construction.
+    semantic_type () YY_NOEXCEPT
+      : yybuffer_ ()
+    {}
+
+    /// Construct and fill.
+    template <typename T>
+    semantic_type (YY_RVREF (T) t)
+    {
+      YY_ASSERT (sizeof (T) <= size);
+      new (yyas_<T> ()) T (YY_MOVE (t));
+    }
+
+    /// Destruction, allowed only if empty.
+    ~semantic_type () YY_NOEXCEPT
+    {}
+
+# if 201103L <= YY_CPLUSPLUS
+    /// Instantiate a \a T in here from \a t.
+    template <typename T, typename... U>
+    T&
+    emplace (U&&... u)
+    {
+      return *new (yyas_<T> ()) T (std::forward <U>(u)...);
+    }
+# else
+    /// Instantiate an empty \a T in here.
+    template <typename T>
+    T&
+    emplace ()
+    {
+      return *new (yyas_<T> ()) T ();
+    }
+
+    /// Instantiate a \a T in here from \a t.
+    template <typename T>
+    T&
+    emplace (const T& t)
+    {
+      return *new (yyas_<T> ()) T (t);
+    }
+# endif
+
+    /// Instantiate an empty \a T in here.
+    /// Obsolete, use emplace.
+    template <typename T>
+    T&
+    build ()
+    {
+      return emplace<T> ();
+    }
+
+    /// Instantiate a \a T in here from \a t.
+    /// Obsolete, use emplace.
+    template <typename T>
+    T&
+    build (const T& t)
+    {
+      return emplace<T> (t);
+    }
+
+    /// Accessor to a built \a T.
+    template <typename T>
+    T&
+    as () YY_NOEXCEPT
+    {
+      return *yyas_<T> ();
+    }
+
+    /// Const accessor to a built \a T (for %printer).
+    template <typename T>
+    const T&
+    as () const YY_NOEXCEPT
+    {
+      return *yyas_<T> ();
+    }
+
+    /// Swap the content with \a that, of same type.
+    ///
+    /// Both variants must be built beforehand, because swapping the actual
+    /// data requires reading it (with as()), and this is not possible on
+    /// unconstructed variants: it would require some dynamic testing, which
+    /// should not be the variant's responsibility.
+    /// Swapping between built and (possibly) non-built is done with
+    /// self_type::move ().
+    template <typename T>
+    void
+    swap (self_type& that) YY_NOEXCEPT
+    {
+      std::swap (as<T> (), that.as<T> ());
+    }
+
+    /// Move the content of \a that to this.
+    ///
+    /// Destroys \a that.
+    template <typename T>
+    void
+    move (self_type& that)
+    {
+# if 201103L <= YY_CPLUSPLUS
+      emplace<T> (std::move (that.as<T> ()));
+# else
+      emplace<T> ();
+      swap<T> (that);
+# endif
+      that.destroy<T> ();
+    }
+
+# if 201103L <= YY_CPLUSPLUS
+    /// Move the content of \a that to this.
+    template <typename T>
+    void
+    move (self_type&& that)
+    {
+      emplace<T> (std::move (that.as<T> ()));
+      that.destroy<T> ();
+    }
+#endif
+
+    /// Copy the content of \a that to this.
+    template <typename T>
+    void
+    copy (const self_type& that)
+    {
+      emplace<T> (that.as<T> ());
+    }
+
+    /// Destroy the stored \a T.
+    template <typename T>
+    void
+    destroy ()
+    {
+      as<T> ().~T ();
+    }
+
+  private:
+    /// Prohibit blind copies.
+    self_type& operator= (const self_type&);
+    semantic_type (const self_type&);
+
+    /// Accessor to raw memory as \a T.
+    template <typename T>
+    T*
+    yyas_ () YY_NOEXCEPT
+    {
+      void *yyp = yybuffer_.yyraw;
+      return static_cast<T*> (yyp);
+     }
+
+    /// Const accessor to raw memory as \a T.
+    template <typename T>
+    const T*
+    yyas_ () const YY_NOEXCEPT
+    {
+      const void *yyp = yybuffer_.yyraw;
+      return static_cast<const T*> (yyp);
+     }
+
+    /// An auxiliary type to compute the largest semantic type.
+    union union_type
+    {
+      // expr
+      char dummy1[sizeof (Expression)];
+
+      // formula
+      char dummy2[sizeof (Formula)];
+
+      // "double"
+      char dummy3[sizeof (double)];
+
+      // "identifier"
+      char dummy4[sizeof (std::string)];
+    };
+
+    /// The size of the largest semantic type.
+    enum { size = sizeof (union_type) };
+
+    /// A buffer to store semantic values.
+    union
+    {
+      /// Strongest alignment constraints.
+      long double yyalign_me;
+      /// A buffer large enough to store any of the semantic values.
+      char yyraw[size];
+    } yybuffer_;
+  };
+
+#else
+    typedef DREALSTYPE semantic_type;
+#endif
+    /// Symbol locations.
+    typedef location location_type;
+
+    /// Syntax errors thrown from user actions.
+    struct syntax_error : std::runtime_error
+    {
+      syntax_error (const location_type& l, const std::string& m)
+        : std::runtime_error (m)
+        , location (l)
+      {}
+
+      syntax_error (const syntax_error& s)
+        : std::runtime_error (s.what ())
+        , location (s.location)
+      {}
+
+      ~syntax_error () YY_NOEXCEPT YY_NOTHROW;
+
+      location_type location;
+    };
+
+    /// Tokens.
+    struct token
+    {
+      enum yytokentype
+      {
+        END = 0,
+        TK_VAR = 258,
+        TK_COST = 259,
+        TK_PREC = 260,
+        TK_CTR = 261,
+        TK_PLUS = 262,
+        TK_MINUS = 263,
+        TK_TIMES = 264,
+        TK_DIV = 265,
+        TK_EQ = 266,
+        TK_LTE = 267,
+        TK_GTE = 268,
+        TK_LT = 269,
+        TK_GT = 270,
+        TK_EXP = 271,
+        TK_LOG = 272,
+        TK_ABS = 273,
+        TK_SIN = 274,
+        TK_COS = 275,
+        TK_TAN = 276,
+        TK_ASIN = 277,
+        TK_ACOS = 278,
+        TK_ATAN = 279,
+        TK_ATAN2 = 280,
+        TK_SINH = 281,
+        TK_COSH = 282,
+        TK_TANH = 283,
+        TK_MIN = 284,
+        TK_MAX = 285,
+        TK_SQRT = 286,
+        TK_POW = 287,
+        TK_CARET = 288,
+        TK_AND = 289,
+        TK_OR = 290,
+        TK_NOT = 291,
+        TK_IMPLIES = 292,
+        TK_LB = 293,
+        TK_RB = 294,
+        TK_COLON = 295,
+        TK_COMMA = 296,
+        TK_SEMICOLON = 297,
+        DOUBLE = 298,
+        ID = 299,
+        TK_NEQ = 300,
+        TK_LEQ = 301,
+        TK_GEQ = 302,
+        UMINUS = 303
+      };
+    };
+
+    /// (External) token type, as returned by yylex.
+    typedef token::yytokentype token_type;
+
+    /// Symbol type: an internal symbol number.
+    typedef int symbol_number_type;
+
+    /// The symbol type number to denote an empty symbol.
+    enum { empty_symbol = -2 };
+
+    /// Internal symbol number for tokens (subsumed by symbol_number_type).
+    typedef signed char token_number_type;
+
+    /// A complete symbol.
+    ///
+    /// Expects its Base type to provide access to the symbol type
+    /// via type_get ().
+    ///
+    /// Provide access to semantic value and location.
+    template <typename Base>
+    struct basic_symbol : Base
+    {
+      /// Alias to Base.
+      typedef Base super_type;
+
+      /// Default constructor.
+      basic_symbol ()
+        : value ()
+        , location ()
+      {}
+
+#if 201103L <= YY_CPLUSPLUS
+      /// Move constructor.
+      basic_symbol (basic_symbol&& that);
+#endif
+
+      /// Copy constructor.
+      basic_symbol (const basic_symbol& that);
+
+      /// Constructor for valueless symbols, and symbols from each type.
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, location_type&& l)
+        : Base (t)
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const location_type& l)
+        : Base (t)
+        , location (l)
+      {}
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, Expression&& v, location_type&& l)
+        : Base (t)
+        , value (std::move (v))
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const Expression& v, const location_type& l)
+        : Base (t)
+        , value (v)
+        , location (l)
+      {}
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, Formula&& v, location_type&& l)
+        : Base (t)
+        , value (std::move (v))
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const Formula& v, const location_type& l)
+        : Base (t)
+        , value (v)
+        , location (l)
+      {}
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, double&& v, location_type&& l)
+        : Base (t)
+        , value (std::move (v))
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const double& v, const location_type& l)
+        : Base (t)
+        , value (v)
+        , location (l)
+      {}
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, std::string&& v, location_type&& l)
+        : Base (t)
+        , value (std::move (v))
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const std::string& v, const location_type& l)
+        : Base (t)
+        , value (v)
+        , location (l)
+      {}
+#endif
+
+      /// Destroy the symbol.
+      ~basic_symbol ()
+      {
+        clear ();
+      }
+
+      /// Destroy contents, and record that is empty.
+      void clear ()
+      {
+        // User destructor.
+        symbol_number_type yytype = this->type_get ();
+        basic_symbol<Base>& yysym = *this;
+        (void) yysym;
+        switch (yytype)
+        {
+       default:
+          break;
+        }
+
+        // Type destructor.
+switch (yytype)
+    {
+      case 64: // expr
+        value.template destroy< Expression > ();
+        break;
+
+      case 63: // formula
+        value.template destroy< Formula > ();
+        break;
+
+      case 43: // "double"
+        value.template destroy< double > ();
+        break;
+
+      case 44: // "identifier"
+        value.template destroy< std::string > ();
+        break;
+
+      default:
+        break;
+    }
+
+        Base::clear ();
+      }
+
+      /// Whether empty.
+      bool empty () const YY_NOEXCEPT;
+
+      /// Destructive move, \a s is emptied into this.
+      void move (basic_symbol& s);
+
+      /// The semantic value.
+      semantic_type value;
+
+      /// The location.
+      location_type location;
+
+    private:
+#if YY_CPLUSPLUS < 201103L
+      /// Assignment operator.
+      basic_symbol& operator= (const basic_symbol& that);
+#endif
+    };
+
+    /// Type access provider for token (enum) based symbols.
+    struct by_type
+    {
+      /// Default constructor.
+      by_type ();
+
+#if 201103L <= YY_CPLUSPLUS
+      /// Move constructor.
+      by_type (by_type&& that);
+#endif
+
+      /// Copy constructor.
+      by_type (const by_type& that);
+
+      /// The symbol type as needed by the constructor.
+      typedef token_type kind_type;
+
+      /// Constructor from (external) token numbers.
+      by_type (kind_type t);
+
+      /// Record that this symbol is empty.
+      void clear ();
+
+      /// Steal the symbol type from \a that.
+      void move (by_type& that);
+
+      /// The (internal) type number (corresponding to \a type).
+      /// \a empty when empty.
+      symbol_number_type type_get () const YY_NOEXCEPT;
+
+      /// The symbol type.
+      /// \a empty_symbol when empty.
+      /// An int, not token_number_type, to be able to store empty_symbol.
+      int type;
+    };
+
+    /// "External" symbols: returned by the scanner.
+    struct symbol_type : basic_symbol<by_type>
+    {
+      /// Superclass.
+      typedef basic_symbol<by_type> super_type;
+
+      /// Empty symbol.
+      symbol_type () {}
+
+      /// Constructor for valueless symbols, and symbols from each type.
+#if 201103L <= YY_CPLUSPLUS
+      symbol_type (int tok, location_type l)
+        : super_type(token_type (tok), std::move (l))
+      {
+        YY_ASSERT (tok == token::END || tok == token::TK_VAR || tok == token::TK_COST || tok == token::TK_PREC || tok == token::TK_CTR || tok == token::TK_PLUS || tok == token::TK_MINUS || tok == token::TK_TIMES || tok == token::TK_DIV || tok == token::TK_EQ || tok == token::TK_LTE || tok == token::TK_GTE || tok == token::TK_LT || tok == token::TK_GT || tok == token::TK_EXP || tok == token::TK_LOG || tok == token::TK_ABS || tok == token::TK_SIN || tok == token::TK_COS || tok == token::TK_TAN || tok == token::TK_ASIN || tok == token::TK_ACOS || tok == token::TK_ATAN || tok == token::TK_ATAN2 || tok == token::TK_SINH || tok == token::TK_COSH || tok == token::TK_TANH || tok == token::TK_MIN || tok == token::TK_MAX || tok == token::TK_SQRT || tok == token::TK_POW || tok == token::TK_CARET || tok == token::TK_AND || tok == token::TK_OR || tok == token::TK_NOT || tok == token::TK_IMPLIES || tok == token::TK_LB || tok == token::TK_RB || tok == token::TK_COLON || tok == token::TK_COMMA || tok == token::TK_SEMICOLON || tok == token::TK_NEQ || tok == token::TK_LEQ || tok == token::TK_GEQ || tok == token::UMINUS || tok == 40 || tok == 41);
+      }
+#else
+      symbol_type (int tok, const location_type& l)
+        : super_type(token_type (tok), l)
+      {
+        YY_ASSERT (tok == token::END || tok == token::TK_VAR || tok == token::TK_COST || tok == token::TK_PREC || tok == token::TK_CTR || tok == token::TK_PLUS || tok == token::TK_MINUS || tok == token::TK_TIMES || tok == token::TK_DIV || tok == token::TK_EQ || tok == token::TK_LTE || tok == token::TK_GTE || tok == token::TK_LT || tok == token::TK_GT || tok == token::TK_EXP || tok == token::TK_LOG || tok == token::TK_ABS || tok == token::TK_SIN || tok == token::TK_COS || tok == token::TK_TAN || tok == token::TK_ASIN || tok == token::TK_ACOS || tok == token::TK_ATAN || tok == token::TK_ATAN2 || tok == token::TK_SINH || tok == token::TK_COSH || tok == token::TK_TANH || tok == token::TK_MIN || tok == token::TK_MAX || tok == token::TK_SQRT || tok == token::TK_POW || tok == token::TK_CARET || tok == token::TK_AND || tok == token::TK_OR || tok == token::TK_NOT || tok == token::TK_IMPLIES || tok == token::TK_LB || tok == token::TK_RB || tok == token::TK_COLON || tok == token::TK_COMMA || tok == token::TK_SEMICOLON || tok == token::TK_NEQ || tok == token::TK_LEQ || tok == token::TK_GEQ || tok == token::UMINUS || tok == 40 || tok == 41);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      symbol_type (int tok, double v, location_type l)
+        : super_type(token_type (tok), std::move (v), std::move (l))
+      {
+        YY_ASSERT (tok == token::DOUBLE);
+      }
+#else
+      symbol_type (int tok, const double& v, const location_type& l)
+        : super_type(token_type (tok), v, l)
+      {
+        YY_ASSERT (tok == token::DOUBLE);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      symbol_type (int tok, std::string v, location_type l)
+        : super_type(token_type (tok), std::move (v), std::move (l))
+      {
+        YY_ASSERT (tok == token::ID);
+      }
+#else
+      symbol_type (int tok, const std::string& v, const location_type& l)
+        : super_type(token_type (tok), v, l)
+      {
+        YY_ASSERT (tok == token::ID);
+      }
+#endif
+    };
+
+    /// Build a parser object.
+    DrParser (class DrDriver& driver_yyarg);
+    virtual ~DrParser ();
+
+    /// Parse.  An alias for parse ().
+    /// \returns  0 iff parsing succeeded.
+    int operator() ();
+
+    /// Parse.
+    /// \returns  0 iff parsing succeeded.
+    virtual int parse ();
+
+#if DREALDEBUG
+    /// The current debugging stream.
+    std::ostream& debug_stream () const YY_ATTRIBUTE_PURE;
+    /// Set the current debugging stream.
+    void set_debug_stream (std::ostream &);
+
+    /// Type for debugging levels.
+    typedef int debug_level_type;
+    /// The current debugging level.
+    debug_level_type debug_level () const YY_ATTRIBUTE_PURE;
+    /// Set the current debugging level.
+    void set_debug_level (debug_level_type l);
+#endif
+
+    /// Report a syntax error.
+    /// \param loc    where the syntax error is found.
+    /// \param msg    a description of the syntax error.
+    virtual void error (const location_type& loc, const std::string& msg);
+
+    /// Report a syntax error.
+    void error (const syntax_error& err);
+
+    // Implementation of make_symbol for each symbol type.
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_END (location_type l)
+      {
+        return symbol_type (token::END, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_END (const location_type& l)
+      {
+        return symbol_type (token::END, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_VAR (location_type l)
+      {
+        return symbol_type (token::TK_VAR, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_VAR (const location_type& l)
+      {
+        return symbol_type (token::TK_VAR, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_COST (location_type l)
+      {
+        return symbol_type (token::TK_COST, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_COST (const location_type& l)
+      {
+        return symbol_type (token::TK_COST, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_PREC (location_type l)
+      {
+        return symbol_type (token::TK_PREC, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_PREC (const location_type& l)
+      {
+        return symbol_type (token::TK_PREC, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_CTR (location_type l)
+      {
+        return symbol_type (token::TK_CTR, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_CTR (const location_type& l)
+      {
+        return symbol_type (token::TK_CTR, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_PLUS (location_type l)
+      {
+        return symbol_type (token::TK_PLUS, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_PLUS (const location_type& l)
+      {
+        return symbol_type (token::TK_PLUS, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_MINUS (location_type l)
+      {
+        return symbol_type (token::TK_MINUS, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_MINUS (const location_type& l)
+      {
+        return symbol_type (token::TK_MINUS, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_TIMES (location_type l)
+      {
+        return symbol_type (token::TK_TIMES, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_TIMES (const location_type& l)
+      {
+        return symbol_type (token::TK_TIMES, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_DIV (location_type l)
+      {
+        return symbol_type (token::TK_DIV, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_DIV (const location_type& l)
+      {
+        return symbol_type (token::TK_DIV, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_EQ (location_type l)
+      {
+        return symbol_type (token::TK_EQ, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_EQ (const location_type& l)
+      {
+        return symbol_type (token::TK_EQ, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_LTE (location_type l)
+      {
+        return symbol_type (token::TK_LTE, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_LTE (const location_type& l)
+      {
+        return symbol_type (token::TK_LTE, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_GTE (location_type l)
+      {
+        return symbol_type (token::TK_GTE, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_GTE (const location_type& l)
+      {
+        return symbol_type (token::TK_GTE, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_LT (location_type l)
+      {
+        return symbol_type (token::TK_LT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_LT (const location_type& l)
+      {
+        return symbol_type (token::TK_LT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_GT (location_type l)
+      {
+        return symbol_type (token::TK_GT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_GT (const location_type& l)
+      {
+        return symbol_type (token::TK_GT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_EXP (location_type l)
+      {
+        return symbol_type (token::TK_EXP, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_EXP (const location_type& l)
+      {
+        return symbol_type (token::TK_EXP, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_LOG (location_type l)
+      {
+        return symbol_type (token::TK_LOG, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_LOG (const location_type& l)
+      {
+        return symbol_type (token::TK_LOG, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_ABS (location_type l)
+      {
+        return symbol_type (token::TK_ABS, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_ABS (const location_type& l)
+      {
+        return symbol_type (token::TK_ABS, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_SIN (location_type l)
+      {
+        return symbol_type (token::TK_SIN, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_SIN (const location_type& l)
+      {
+        return symbol_type (token::TK_SIN, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_COS (location_type l)
+      {
+        return symbol_type (token::TK_COS, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_COS (const location_type& l)
+      {
+        return symbol_type (token::TK_COS, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_TAN (location_type l)
+      {
+        return symbol_type (token::TK_TAN, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_TAN (const location_type& l)
+      {
+        return symbol_type (token::TK_TAN, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_ASIN (location_type l)
+      {
+        return symbol_type (token::TK_ASIN, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_ASIN (const location_type& l)
+      {
+        return symbol_type (token::TK_ASIN, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_ACOS (location_type l)
+      {
+        return symbol_type (token::TK_ACOS, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_ACOS (const location_type& l)
+      {
+        return symbol_type (token::TK_ACOS, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_ATAN (location_type l)
+      {
+        return symbol_type (token::TK_ATAN, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_ATAN (const location_type& l)
+      {
+        return symbol_type (token::TK_ATAN, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_ATAN2 (location_type l)
+      {
+        return symbol_type (token::TK_ATAN2, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_ATAN2 (const location_type& l)
+      {
+        return symbol_type (token::TK_ATAN2, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_SINH (location_type l)
+      {
+        return symbol_type (token::TK_SINH, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_SINH (const location_type& l)
+      {
+        return symbol_type (token::TK_SINH, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_COSH (location_type l)
+      {
+        return symbol_type (token::TK_COSH, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_COSH (const location_type& l)
+      {
+        return symbol_type (token::TK_COSH, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_TANH (location_type l)
+      {
+        return symbol_type (token::TK_TANH, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_TANH (const location_type& l)
+      {
+        return symbol_type (token::TK_TANH, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_MIN (location_type l)
+      {
+        return symbol_type (token::TK_MIN, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_MIN (const location_type& l)
+      {
+        return symbol_type (token::TK_MIN, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_MAX (location_type l)
+      {
+        return symbol_type (token::TK_MAX, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_MAX (const location_type& l)
+      {
+        return symbol_type (token::TK_MAX, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_SQRT (location_type l)
+      {
+        return symbol_type (token::TK_SQRT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_SQRT (const location_type& l)
+      {
+        return symbol_type (token::TK_SQRT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_POW (location_type l)
+      {
+        return symbol_type (token::TK_POW, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_POW (const location_type& l)
+      {
+        return symbol_type (token::TK_POW, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_CARET (location_type l)
+      {
+        return symbol_type (token::TK_CARET, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_CARET (const location_type& l)
+      {
+        return symbol_type (token::TK_CARET, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_AND (location_type l)
+      {
+        return symbol_type (token::TK_AND, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_AND (const location_type& l)
+      {
+        return symbol_type (token::TK_AND, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_OR (location_type l)
+      {
+        return symbol_type (token::TK_OR, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_OR (const location_type& l)
+      {
+        return symbol_type (token::TK_OR, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_NOT (location_type l)
+      {
+        return symbol_type (token::TK_NOT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_NOT (const location_type& l)
+      {
+        return symbol_type (token::TK_NOT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_IMPLIES (location_type l)
+      {
+        return symbol_type (token::TK_IMPLIES, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_IMPLIES (const location_type& l)
+      {
+        return symbol_type (token::TK_IMPLIES, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_LB (location_type l)
+      {
+        return symbol_type (token::TK_LB, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_LB (const location_type& l)
+      {
+        return symbol_type (token::TK_LB, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_RB (location_type l)
+      {
+        return symbol_type (token::TK_RB, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_RB (const location_type& l)
+      {
+        return symbol_type (token::TK_RB, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_COLON (location_type l)
+      {
+        return symbol_type (token::TK_COLON, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_COLON (const location_type& l)
+      {
+        return symbol_type (token::TK_COLON, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_COMMA (location_type l)
+      {
+        return symbol_type (token::TK_COMMA, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_COMMA (const location_type& l)
+      {
+        return symbol_type (token::TK_COMMA, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_SEMICOLON (location_type l)
+      {
+        return symbol_type (token::TK_SEMICOLON, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_SEMICOLON (const location_type& l)
+      {
+        return symbol_type (token::TK_SEMICOLON, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_DOUBLE (double v, location_type l)
+      {
+        return symbol_type (token::DOUBLE, std::move (v), std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_DOUBLE (const double& v, const location_type& l)
+      {
+        return symbol_type (token::DOUBLE, v, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_ID (std::string v, location_type l)
+      {
+        return symbol_type (token::ID, std::move (v), std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_ID (const std::string& v, const location_type& l)
+      {
+        return symbol_type (token::ID, v, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_NEQ (location_type l)
+      {
+        return symbol_type (token::TK_NEQ, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_NEQ (const location_type& l)
+      {
+        return symbol_type (token::TK_NEQ, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_LEQ (location_type l)
+      {
+        return symbol_type (token::TK_LEQ, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_LEQ (const location_type& l)
+      {
+        return symbol_type (token::TK_LEQ, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TK_GEQ (location_type l)
+      {
+        return symbol_type (token::TK_GEQ, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TK_GEQ (const location_type& l)
+      {
+        return symbol_type (token::TK_GEQ, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_UMINUS (location_type l)
+      {
+        return symbol_type (token::UMINUS, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_UMINUS (const location_type& l)
+      {
+        return symbol_type (token::UMINUS, l);
+      }
+#endif
+
+
+  private:
+    /// This class is not copyable.
+    DrParser (const DrParser&);
+    DrParser& operator= (const DrParser&);
+
+    /// Stored state numbers (used for stacks).
+    typedef unsigned char state_type;
+
+    /// Generate an error message.
+    /// \param yystate   the state where the error occurred.
+    /// \param yyla      the lookahead token.
+    virtual std::string yysyntax_error_ (state_type yystate,
+                                         const symbol_type& yyla) const;
+
+    /// Compute post-reduction state.
+    /// \param yystate   the current state
+    /// \param yysym     the nonterminal to push on the stack
+    static state_type yy_lr_goto_state_ (state_type yystate, int yysym);
+
+    /// Whether the given \c yypact_ value indicates a defaulted state.
+    /// \param yyvalue   the value to check
+    static bool yy_pact_value_is_default_ (int yyvalue);
+
+    /// Whether the given \c yytable_ value indicates a syntax error.
+    /// \param yyvalue   the value to check
+    static bool yy_table_value_is_error_ (int yyvalue);
+
+    static const signed char yypact_ninf_;
+    static const signed char yytable_ninf_;
+
+    /// Convert a scanner token number \a t to a symbol number.
+    /// In theory \a t should be a token_type, but character literals
+    /// are valid, yet not members of the token_type enum.
+    static token_number_type yytranslate_ (int t);
+
+    // Tables.
+    // YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
+    // STATE-NUM.
+    static const short yypact_[];
+
+    // YYDEFACT[STATE-NUM] -- Default reduction number in state STATE-NUM.
+    // Performed when YYTABLE does not specify something else to do.  Zero
+    // means the default is an error.
+    static const signed char yydefact_[];
+
+    // YYPGOTO[NTERM-NUM].
+    static const short yypgoto_[];
+
+    // YYDEFGOTO[NTERM-NUM].
+    static const signed char yydefgoto_[];
+
+    // YYTABLE[YYPACT[STATE-NUM]] -- What to do in state STATE-NUM.  If
+    // positive, shift that token.  If negative, reduce the rule whose
+    // number is the opposite.  If YYTABLE_NINF, syntax error.
+    static const unsigned char yytable_[];
+
+    static const short yycheck_[];
+
+    // YYSTOS[STATE-NUM] -- The (internal number of the) accessing
+    // symbol of state STATE-NUM.
+    static const signed char yystos_[];
+
+    // YYR1[YYN] -- Symbol number of symbol that rule YYN derives.
+    static const signed char yyr1_[];
+
+    // YYR2[YYN] -- Number of symbols on the right hand side of rule YYN.
+    static const signed char yyr2_[];
+
+
+    /// Convert the symbol name \a n to a form suitable for a diagnostic.
+    static std::string yytnamerr_ (const char *n);
+
+
+    /// For a symbol, its name in clear.
+    static const char* const yytname_[];
+#if DREALDEBUG
+    // YYRLINE[YYN] -- Source line where rule number YYN was defined.
+    static const unsigned char yyrline_[];
+    /// Report on the debug stream that the rule \a r is going to be reduced.
+    virtual void yy_reduce_print_ (int r);
+    /// Print the state stack on the debug stream.
+    virtual void yystack_print_ ();
+
+    /// Debugging level.
+    int yydebug_;
+    /// Debug stream.
+    std::ostream* yycdebug_;
+
+    /// \brief Display a symbol type, value and location.
+    /// \param yyo    The output stream.
+    /// \param yysym  The symbol.
+    template <typename Base>
+    void yy_print_ (std::ostream& yyo, const basic_symbol<Base>& yysym) const;
+#endif
+
+    /// \brief Reclaim the memory associated to a symbol.
+    /// \param yymsg     Why this token is reclaimed.
+    ///                  If null, print nothing.
+    /// \param yysym     The symbol.
+    template <typename Base>
+    void yy_destroy_ (const char* yymsg, basic_symbol<Base>& yysym) const;
+
+  private:
+    /// Type access provider for state based symbols.
+    struct by_state
+    {
+      /// Default constructor.
+      by_state () YY_NOEXCEPT;
+
+      /// The symbol type as needed by the constructor.
+      typedef state_type kind_type;
+
+      /// Constructor.
+      by_state (kind_type s) YY_NOEXCEPT;
+
+      /// Copy constructor.
+      by_state (const by_state& that) YY_NOEXCEPT;
+
+      /// Record that this symbol is empty.
+      void clear () YY_NOEXCEPT;
+
+      /// Steal the symbol type from \a that.
+      void move (by_state& that);
+
+      /// The (internal) type number (corresponding to \a state).
+      /// \a empty_symbol when empty.
+      symbol_number_type type_get () const YY_NOEXCEPT;
+
+      /// The state number used to denote an empty symbol.
+      /// We use the initial state, as it does not have a value.
+      enum { empty_state = 0 };
+
+      /// The state.
+      /// \a empty when empty.
+      state_type state;
+    };
+
+    /// "Internal" symbol: element of the stack.
+    struct stack_symbol_type : basic_symbol<by_state>
+    {
+      /// Superclass.
+      typedef basic_symbol<by_state> super_type;
+      /// Construct an empty symbol.
+      stack_symbol_type ();
+      /// Move or copy construction.
+      stack_symbol_type (YY_RVREF (stack_symbol_type) that);
+      /// Steal the contents from \a sym to build this.
+      stack_symbol_type (state_type s, YY_MOVE_REF (symbol_type) sym);
+#if YY_CPLUSPLUS < 201103L
+      /// Assignment, needed by push_back by some old implementations.
+      /// Moves the contents of that.
+      stack_symbol_type& operator= (stack_symbol_type& that);
+
+      /// Assignment, needed by push_back by other implementations.
+      /// Needed by some other old implementations.
+      stack_symbol_type& operator= (const stack_symbol_type& that);
+#endif
+    };
+
+    /// A stack with random access from its top.
+    template <typename T, typename S = std::vector<T> >
+    class stack
+    {
+    public:
+      // Hide our reversed order.
+      typedef typename S::reverse_iterator iterator;
+      typedef typename S::const_reverse_iterator const_iterator;
+      typedef typename S::size_type size_type;
+      typedef typename std::ptrdiff_t index_type;
+
+      stack (size_type n = 200)
+        : seq_ (n)
+      {}
+
+      /// Random access.
+      ///
+      /// Index 0 returns the topmost element.
+      const T&
+      operator[] (index_type i) const
+      {
+        return seq_[size_type (size () - 1 - i)];
+      }
+
+      /// Random access.
+      ///
+      /// Index 0 returns the topmost element.
+      T&
+      operator[] (index_type i)
+      {
+        return seq_[size_type (size () - 1 - i)];
+      }
+
+      /// Steal the contents of \a t.
+      ///
+      /// Close to move-semantics.
+      void
+      push (YY_MOVE_REF (T) t)
+      {
+        seq_.push_back (T ());
+        operator[] (0).move (t);
+      }
+
+      /// Pop elements from the stack.
+      void
+      pop (std::ptrdiff_t n = 1) YY_NOEXCEPT
+      {
+        for (; 0 < n; --n)
+          seq_.pop_back ();
+      }
+
+      /// Pop all elements from the stack.
+      void
+      clear () YY_NOEXCEPT
+      {
+        seq_.clear ();
+      }
+
+      /// Number of elements on the stack.
+      index_type
+      size () const YY_NOEXCEPT
+      {
+        return index_type (seq_.size ());
+      }
+
+      std::ptrdiff_t
+      ssize () const YY_NOEXCEPT
+      {
+        return std::ptrdiff_t (size ());
+      }
+
+      /// Iterator on top of the stack (going downwards).
+      const_iterator
+      begin () const YY_NOEXCEPT
+      {
+        return seq_.rbegin ();
+      }
+
+      /// Bottom of the stack.
+      const_iterator
+      end () const YY_NOEXCEPT
+      {
+        return seq_.rend ();
+      }
+
+      /// Present a slice of the top of a stack.
+      class slice
+      {
+      public:
+        slice (const stack& stack, index_type range)
+          : stack_ (stack)
+          , range_ (range)
+        {}
+
+        const T&
+        operator[] (index_type i) const
+        {
+          return stack_[range_ - i];
+        }
+
+      private:
+        const stack& stack_;
+        index_type range_;
+      };
+
+    private:
+      stack (const stack&);
+      stack& operator= (const stack&);
+      /// The wrapped container.
+      S seq_;
+    };
+
+
+    /// Stack type.
+    typedef stack<stack_symbol_type> stack_type;
+
+    /// The stack.
+    stack_type yystack_;
+
+    /// Push a new state on the stack.
+    /// \param m    a debug message to display
+    ///             if null, no trace is output.
+    /// \param sym  the symbol
+    /// \warning the contents of \a s.value is stolen.
+    void yypush_ (const char* m, YY_MOVE_REF (stack_symbol_type) sym);
+
+    /// Push a new look ahead token on the state on the stack.
+    /// \param m    a debug message to display
+    ///             if null, no trace is output.
+    /// \param s    the state
+    /// \param sym  the symbol (for its value and location).
+    /// \warning the contents of \a sym.value is stolen.
+    void yypush_ (const char* m, state_type s, YY_MOVE_REF (symbol_type) sym);
+
+    /// Pop \a n symbols from the stack.
+    void yypop_ (int n = 1);
+
+    /// Some specific tokens.
+    static const token_number_type yy_error_token_ = 1;
+    static const token_number_type yy_undef_token_ = 2;
+
+    /// Constants.
+    enum
+    {
+      yyeof_ = 0,
+      yylast_ = 455,     ///< Last index in yytable_.
+      yynnts_ = 14,  ///< Number of nonterminal symbols.
+      yyfinal_ = 5, ///< Termination state number.
+      yyntokens_ = 51  ///< Number of tokens.
+    };
+
+
+    // User arguments.
+    class DrDriver& driver;
+  };
+
+
+} // dreal
+#line 1788 "bazel-out/k8-opt/bin/dreal/dr/parser.yy.hh"
+
+
+
+
+
+#endif // !YY_DREAL_BAZEL_OUT_K8_OPT_BIN_DREAL_DR_PARSER_YY_HH_INCLUDED