Regenerate.

[bison.git] / data / lalr1.cc

diff --git a/data/lalr1.cc b/data/lalr1.cc
index f246d0b8cf5d58b80601e543e63e884f5b286d0c..bc1bec1276533308ac162c3d7149aa4dc41efe6f 100644 (file)
--- a/data/lalr1.cc
+++ b/data/lalr1.cc
@@ -1,6 +1,8 @@
 m4_divert(-1)
 m4_divert(-1)

+

 # C++ skeleton for Bison
 # C++ skeleton for Bison

-# Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
+
+# Copyright (C) 2002, 2003, 2004, 2005 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
 
 # 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


@@ -14,107 +16,10 @@ m4_divert(-1)
 
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software
 
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software

-# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-# 02111-1307  USA
-
-## ---------------- ##
-## Default values.  ##
-## ---------------- ##
-
-# Default Parser class name.
-m4_define_default([b4_parser_class_name], [Parser])
-
-
-
-## ----------------- ##
-## Semantic Values.  ##
-## ----------------- ##
-
-
-# b4_lhs_value([TYPE])
-# --------------------
-# Expansion of $<TYPE>$.
-m4_define([b4_lhs_value],
-[yyval[]m4_ifval([$1], [.$1])])
-
-
-# b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
-# --------------------------------------
-# Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
-# symbols on RHS.
-m4_define([b4_rhs_value],
-[semantic_stack_@{m4_eval([$1 - $2])@}m4_ifval([$3], [.$3])])
-
-m4_define_default([b4_location_type], [Location])
-
-# b4_lhs_location()
-# -----------------
-# Expansion of @$.
-m4_define([b4_lhs_location],
-[yyloc])
-
-
-# b4_rhs_location(RULE-LENGTH, NUM)
-# ---------------------------------
-# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
-# on RHS.
-m4_define([b4_rhs_location],
-[location_stack_@{m4_eval([$1 - $2])@}])
-
-
-m4_define([b4_inherit],
-          [m4_ifdef([b4_root],
-                   [: public b4_root
-],
-                   [])])
-
-m4_define([b4_param],
-         [m4_ifdef([b4_root],
-                   [,
-            const Param& param],
-                   [])])
-
-m4_define([b4_constructor],
-         [m4_ifdef([b4_root],
-                   [b4_root (param),
-      ],
-                   [])])
-
-
-# b4_parse_param_decl
-# -------------------
-#  Constructor's extra arguments.
-m4_define([b4_parse_param_decl],
-          [m4_ifset([b4_parse_param], [, b4_c_ansi_formals(b4_parse_param)])])
-
-# b4_parse_param_cons
-# -------------------
-#  constructor's extra initialisations.
-m4_define([b4_parse_param_cons],
-          [m4_ifset([b4_parse_param],
-                   [,
-      b4_cc_constructor_calls(b4_parse_param)])])
-m4_define([b4_cc_constructor_calls],
-         [m4_map_sep([b4_cc_constructor_call], [,
-      ], [$@])])
-m4_define([b4_cc_constructor_call],
-         [$2($2)])
-
-# b4_parse_param_vars
-# -------------------
-#  Extra instance variables.
-m4_define([b4_parse_param_vars],
-          [m4_ifset([b4_parse_param],
-                   [
-    /* User arguments.  */
-b4_cc_var_decls(b4_parse_param)])])
-m4_define([b4_cc_var_decls],
-         [m4_map_sep([b4_cc_var_decl], [
-], [$@])])
-m4_define([b4_cc_var_decl],
-         [    $1;])
-
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301  USA

 
 

+m4_include(b4_pkgdatadir/[c++.m4])

 
 # We do want M4 expansion after # for CPP macros.
 m4_changecom()
 
 # We do want M4 expansion after # for CPP macros.
 m4_changecom()


@@ -122,22 +27,25 @@ m4_divert(0)dnl
 m4_if(b4_defines_flag, 0, [],
 [@output @output_header_name@
 b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison],
 m4_if(b4_defines_flag, 0, [],
 [@output @output_header_name@
 b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison],

-             [2002, 2003, 2004])[
+             [2002, 2003, 2004, 2005])[

 /* FIXME: This is wrong, we want computed header guards.
    I don't know why the macros are missing now. :( */
 #ifndef PARSER_HEADER_H
 # define PARSER_HEADER_H
 
 /* FIXME: This is wrong, we want computed header guards.
    I don't know why the macros are missing now. :( */
 #ifndef PARSER_HEADER_H
 # define PARSER_HEADER_H
 

-#include "stack.hh"
-#include "location.hh"
-

 #include <string>
 #include <iostream>
 
 /* Using locations.  */
 #define YYLSP_NEEDED ]b4_locations_flag[
 
 #include <string>
 #include <iostream>
 
 /* Using locations.  */
 #define YYLSP_NEEDED ]b4_locations_flag[
 

-]b4_token_defines(b4_tokens)[
+namespace yy
+{
+  class position;
+  class location;
+}
+
+]b4_token_enums(b4_tokens)[

 
 /* Copy the first part of user declarations.  */
 ]b4_pre_prologue[
 
 /* Copy the first part of user declarations.  */
 ]b4_pre_prologue[


@@ -145,26 +53,43 @@ b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison],
 ]/* Line __line__ of lalr1.cc.  */
 b4_syncline([@oline@], [@ofile@])[
 
 ]/* Line __line__ of lalr1.cc.  */
 b4_syncline([@oline@], [@ofile@])[
 

+#include "stack.hh"
+#include "location.hh"
+

 /* Enabling traces.  */
 #ifndef YYDEBUG
 # define YYDEBUG ]b4_debug[
 #endif
 
 /* Enabling traces.  */
 #ifndef YYDEBUG
 # define YYDEBUG ]b4_debug[
 #endif
 

-/* Enabling verbose error message.  */
-#ifndef YYERROR_VERBOSE
+/* Enabling verbose error messages.  */
+#ifdef YYERROR_VERBOSE
+# undef YYERROR_VERBOSE
+# define YYERROR_VERBOSE 1
+#else

 # define YYERROR_VERBOSE ]b4_error_verbose[
 #endif
 
 # define YYERROR_VERBOSE ]b4_error_verbose[
 #endif
 

-#ifdef YYSTYPE
-typedef YYSTYPE yystype;
+#if YYERROR_VERBOSE
+# define YYERROR_VERBOSE_IF(x) x

 #else
 #else

+# define YYERROR_VERBOSE_IF(x) /* empty */
+#endif
+
+/* Enabling the token table.  */
+#ifndef YYTOKEN_TABLE
+# define YYTOKEN_TABLE ]b4_token_table[
+#endif
+
+#if ! defined (YYSTYPE) && ! defined (YYSTYPE_IS_DECLARED)

 ]m4_ifdef([b4_stype],
 ]m4_ifdef([b4_stype],

-[b4_syncline([b4_stype_line], [b4_filename])
-typedef union b4_stype yystype;
+[b4_syncline([b4_stype_line], [b4_file_name])
+union YYSTYPE b4_stype;

 /* Line __line__ of lalr1.cc.  */
 b4_syncline([@oline@], [@ofile@])],
 /* Line __line__ of lalr1.cc.  */
 b4_syncline([@oline@], [@ofile@])],

-[typedef int yystype;])[
-# define YYSTYPE yystype
+[typedef int YYSTYPE;])[
+# define yystype YYSTYPE /* obsolescent; will be withdrawn */
+# define YYSTYPE_IS_DECLARED 1
+# define YYSTYPE_IS_TRIVIAL 1

 #endif
 
 /* Copy the second part of user declarations.  */
 #endif
 
 /* Copy the second part of user declarations.  */


@@ -172,58 +97,41 @@ b4_syncline([@oline@], [@ofile@])],
 
 ]/* Line __line__ of lalr1.cc.  */
 b4_syncline([@oline@], [@ofile@])[
 
 ]/* Line __line__ of lalr1.cc.  */
 b4_syncline([@oline@], [@ofile@])[

+/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
+   If N is 0, then set CURRENT to the empty location which ends
+   the previous symbol: RHS[0] (always defined).  */
+

 #ifndef YYLLOC_DEFAULT
 #ifndef YYLLOC_DEFAULT

-# define YYLLOC_DEFAULT(Current, Rhs, N) \
-   ((Current).end = Rhs[N].end)
+# define YYLLOC_DEFAULT(Current, Rhs, N)               \
+do {                                                   \
+  if (N)                                               \
+    {                                                  \
+      (Current).begin = (Rhs)[1].begin;                        \
+      (Current).end   = (Rhs)[N].end;                  \
+    }                                                  \
+  else                                                 \
+    {                                                  \
+      (Current).begin = (Current).end = (Rhs)[0].end;  \
+    }                                                  \
+} while (0)

 #endif
 
 namespace yy
 {
 #endif
 
 namespace yy
 {

-  class ]b4_parser_class_name[;

 
 

-  template < typename P >
-  struct Traits
+  /// A Bison parser.
+  class ]b4_parser_class_name[

   {
   {

-  };
-
-  template < >
-  struct Traits< ]b4_parser_class_name[ >
-  {
-    typedef ]b4_int_type_for([b4_translate])[ TokenNumberType;
-    typedef ]b4_int_type_for([b4_rhs])[       RhsNumberType;
-    typedef int      StateType;
-    typedef yystype  SemanticType;
-    typedef ]b4_location_type[ LocationType;
-  };
-}
+    /// Symbol semantic values.
+    typedef YYSTYPE semantic_type;
+    /// Symbol locations.
+    typedef ]b4_location_type[ location_type;

 
 

-namespace yy
-{
-  class ]b4_parser_class_name b4_inherit[
-  {

   public:
   public:

-
-    typedef Traits< ]b4_parser_class_name[ >::TokenNumberType TokenNumberType;
-    typedef Traits< ]b4_parser_class_name[ >::RhsNumberType   RhsNumberType;
-    typedef Traits< ]b4_parser_class_name[ >::StateType       StateType;
-    typedef Traits< ]b4_parser_class_name[ >::SemanticType    SemanticType;
-    typedef Traits< ]b4_parser_class_name[ >::LocationType    LocationType;
-
-    typedef Stack< StateType >    StateStack;
-    typedef Stack< SemanticType > SemanticStack;
-    typedef Stack< LocationType > LocationStack;
-
-#if YYLSP_NEEDED
-    ]b4_parser_class_name[ (bool debug,
-           LocationType initlocation][]b4_param[]b4_parse_param_decl[) :
-      ]b4_constructor[][debug_ (debug),
-      cdebug_ (std::cerr),
-      initlocation_ (initlocation)]b4_parse_param_cons[
-#else
-    ]b4_parser_class_name[ (bool debug][]b4_param[]b4_parse_param_decl[) :
-      ]b4_constructor[][debug_ (debug),
-      cdebug_ (std::cerr)]b4_parse_param_cons[
-#endif
+    /// Build a parser object.
+    ]b4_parser_class_name[ (]b4_parse_param_decl[) :
+      yydebug_ (false),
+      yycdebug_ (&std::cerr)]b4_parse_param_cons[

     {
     }
 
     {
     }
 


@@ -231,107 +139,161 @@ namespace yy
     {
     }
 
     {
     }
 

+    /// Parse.
+    /// \returns  0 iff parsing succeeded.

     virtual int parse ();
 
     virtual int parse ();
 

+    /// The current debugging stream.
+    std::ostream& debug_stream () const;
+    /// 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;
+    /// Set the current debugging level.
+    void set_debug_level (debug_level_type l);
+

   private:
   private:

+    /// 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);
+
+    /// Generate an error message.
+    /// \param tok    the look-ahead token.
+    virtual std::string yysyntax_error_ (YYERROR_VERBOSE_IF (int tok));

 
 

-    virtual void lex_ ();
-    virtual void error_ ();
-    virtual void print_ ();
-    virtual void report_syntax_error_ ();

 #if YYDEBUG
 #if YYDEBUG

-    virtual void symprint_ (int yytype,
-                           const SemanticType *yyvaluep,
-                           const LocationType *yylocationp);
+    /// \brief Report a symbol on the debug stream.
+    /// \param yytype       The token type.
+    /// \param yyvaluep     Its semantic value.
+    /// \param yylocationp  Its location.
+    virtual void yysymprint_ (int yytype,
+                             const semantic_type* yyvaluep,
+                             const location_type* yylocationp);

 #endif /* ! YYDEBUG */
 
 
 #endif /* ! YYDEBUG */
 
 

-    /* Stacks.  */
-    StateStack    state_stack_;
-    SemanticStack semantic_stack_;
-    LocationStack location_stack_;
-
+    /// State numbers.
+    typedef int state_type;
+    /// State stack type.
+    typedef stack<state_type>    state_stack_type;
+    /// Semantic value stack type.
+    typedef stack<semantic_type> semantic_stack_type;
+    /// location stack type.
+    typedef stack<location_type> location_stack_type;
+
+    /// The state stack.
+    state_stack_type yystate_stack_;
+    /// The semantic value stack.
+    semantic_stack_type yysemantic_stack_;
+    /// The location stack.
+    location_stack_type yylocation_stack_;
+
+    /// Internal symbol numbers.
+    typedef ]b4_int_type_for([b4_translate])[ token_number_type;

     /* Tables.  */
     /* Tables.  */

-    static const ]b4_int_type_for([b4_pact])[ pact_[];
-    static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ pact_ninf_;
-    static const ]b4_int_type_for([b4_defact])[ defact_[];
-    static const ]b4_int_type_for([b4_pgoto])[ pgoto_[];
-    static const ]b4_int_type_for([b4_defgoto])[ defgoto_[];
-    static const ]b4_int_type_for([b4_table])[ table_[];
-    static const ]b4_int_type(b4_table_ninf, b4_table_ninf)[ table_ninf_;
-    static const ]b4_int_type_for([b4_check])[ check_[];
-    static const ]b4_int_type_for([b4_stos])[ stos_[];
-    static const ]b4_int_type_for([b4_r1])[ r1_[];
-    static const ]b4_int_type_for([b4_r2])[ r2_[];
-
-#if YYDEBUG || YYERROR_VERBOSE
-    static const char* const name_[];
+    /// For a state, the index in \a yytable_ of its portion.
+    static const ]b4_int_type_for([b4_pact])[ yypact_[];
+    static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ yypact_ninf_;
+
+    /// For a state, default rule to reduce.
+    /// Unless\a  yytable_ specifies something else to do.
+    /// Zero means the default is an error.
+    static const ]b4_int_type_for([b4_defact])[ yydefact_[];
+
+    static const ]b4_int_type_for([b4_pgoto])[ yypgoto_[];
+    static const ]b4_int_type_for([b4_defgoto])[ yydefgoto_[];
+
+    /// What to do in a state.
+    /// \a yytable_[yypact_[s]]: what to do in state \a s.
+    /// - if positive, shift that token.
+    /// - if negative, reduce the rule which number is the opposite.
+    /// - if zero, do what YYDEFACT says.
+    static const ]b4_int_type_for([b4_table])[ yytable_[];
+    static const ]b4_int_type(b4_table_ninf, b4_table_ninf)[ yytable_ninf_;
+
+    static const ]b4_int_type_for([b4_check])[ yycheck_[];
+
+    /// For a state, its accessing symbol.
+    static const ]b4_int_type_for([b4_stos])[ yystos_[];
+
+    /// For a rule, its LHS.
+    static const ]b4_int_type_for([b4_r1])[ yyr1_[];
+    /// For a rule, its RHS length.
+    static const ]b4_int_type_for([b4_r2])[ yyr2_[];
+
+#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
+    /// For a symbol, its name in clear.
+    static const char* const yytname_[];
+#endif
+
+#if YYERROR_VERBOSE
+    /// Convert the symbol name \a n to a form suitable for a diagnostic.
+    virtual std::string yytnamerr_ (const char *n);

 #endif
 
 #endif
 

-    /* More tables, for debugging.  */

 #if YYDEBUG
 #if YYDEBUG

-    static const RhsNumberType rhs_[];
-    static const ]b4_int_type_for([b4_prhs])[ prhs_[];
-    static const ]b4_int_type_for([b4_rline])[ rline_[];
-    static const ]b4_int_type_for([b4_toknum])[ token_number_[];
-    virtual void reduce_print_ (int yyrule);
-    virtual void stack_print_ ();
+    /// A type to store symbol numbers and -1.
+    typedef ]b4_int_type_for([b4_rhs])[ rhs_number_type;
+    /// A `-1'-separated list of the rules' RHS.
+    static const rhs_number_type yyrhs_[];
+    /// For each rule, the index of the first RHS symbol in \a yyrhs_.
+    static const ]b4_int_type_for([b4_prhs])[ yyprhs_[];
+    /// For each rule, its source line number.
+    static const ]b4_int_type_for([b4_rline])[ yyrline_[];
+    /// For each scanner token number, its symbol number.
+    static const ]b4_int_type_for([b4_toknum])[ yytoken_number_[];
+    /// Report on the debug stream that the rule \a r is going to be reduced.
+    virtual void yyreduce_print_ (int r);
+    /// Print the state stack on the debug stream.
+    virtual void yystack_print_ ();

 #endif
 
 #endif
 

-    /* Even more tables.  */
-    inline TokenNumberType translate_ (int token);
-    inline void destruct_ (const char *yymsg,
-                           int yytype,
-                           SemanticType *yyvaluep, LocationType *yylocationp);
+    /// Convert a scanner token number to a symbol number.
+    inline token_number_type yytranslate_ (int token);
+
+    /// \brief Reclaim the memory associated to a symbol.
+    /// \param yymsg        Why this token is reclaimed.
+    /// \param yytype       The symbol type.
+    /// \param yyvaluep     Its semantic value.
+    /// \param yylocationp  Its location.
+    inline void yydestruct_ (const char* yymsg,
+                             int yytype,
+                             semantic_type* yyvaluep,
+                             location_type* yylocationp);

 
     /// Pop \a n symbols the three stacks.
 
     /// Pop \a n symbols the three stacks.

-    inline void pop (unsigned int n = 1);
+    inline void yypop_ (unsigned int n = 1);

 
     /* Constants.  */
 
     /* Constants.  */

-    static const int eof_;
+    static const int yyeof_;

     /* LAST_ -- Last index in TABLE_.  */
     /* LAST_ -- Last index in TABLE_.  */

-    static const int last_;
-    static const int nnts_;
-    static const int empty_;
-    static const int final_;
-    static const int terror_;
-    static const int errcode_;
-    static const int ntokens_;
-    static const unsigned int user_token_number_max_;
-    static const TokenNumberType undef_token_;
+    static const int yylast_;
+    static const int yynnts_;
+    static const int yyempty_;
+    static const int yyfinal_;
+    static const int yyterror_;
+    static const int yyerrcode_;
+    static const int yyntokens_;
+    static const unsigned int yyuser_token_number_max_;
+    static const token_number_type yyundef_token_;

 
     /* State.  */
 
     /* State.  */

-    int n_;
-    int len_;
-    int state_;
+    int yyn_;
+    int yylen_;
+    int yystate_;

 
     /* Error handling. */
 
     /* Error handling. */

-    int nerrs_;
-    int errstatus_;
+    int yynerrs_;
+    int yyerrstatus_;

 
     /* Debugging.  */
 
     /* Debugging.  */

-    int debug_;
-    std::ostream &cdebug_;
-
-    /* Look-ahead and look-ahead in internal form.  */
-    int looka_;
-    int ilooka_;
-
-    /* Message.  */
-    std::string message;
+    int yydebug_;
+    std::ostream* yycdebug_;

 
 

-    /* Semantic value and location of look-ahead token.  */
-    SemanticType value;
-    LocationType location;
-    /* Beginning of the last erroneous token popped off.  */
-    Position error_start_;
-
-    /* @@$ and $$.  */
-    SemanticType yyval;
-    LocationType yyloc;
-
-    /* Initial location.  */
-    LocationType initlocation_;

 ]b4_parse_param_vars[
   };
 }
 ]b4_parse_param_vars[
   };
 }


@@ -340,42 +302,59 @@ namespace yy
 ])dnl
 @output @output_parser_name@
 b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison],
 ])dnl
 @output @output_parser_name@
 b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison],

-             [2002, 2003, 2004])
+             [2002, 2003, 2004, 2005])
+m4_if(b4_prefix[], [yy], [],
+[
+// Take the name prefix into account.
+#define yylex   b4_prefix[]lex])
+m4_if(b4_defines_flag, 0, [],
+[
+#include @output_header_name@])[
+
+#ifndef YY_
+# if YYENABLE_NLS
+#  if ENABLE_NLS
+#   include <libintl.h> /* FIXME: INFRINGES ON USER NAME SPACE */
+#   define YY_(msgid) dgettext ("bison-runtime", msgid)
+#  endif
+# endif
+# ifndef YY_
+#  define YY_(msgid) msgid
+# endif
+#endif

 
 

-m4_if(b4_defines_flag, 0, [], [#include @output_header_name@])[
+/* A pseudo ostream that takes yydebug_ into account. */
+# define YYCDEBUG                                                      \
+  for (bool yydebugcond_ = yydebug_; yydebugcond_; yydebugcond_ = false)       \
+    (*yycdebug_)

 
 /* Enable debugging if requested.  */
 #if YYDEBUG
 
 
 /* Enable debugging if requested.  */
 #if YYDEBUG
 

-# define YYCDEBUG                              \
-  if (debug_)                                  \
-    cdebug_
-

 # define YY_SYMBOL_PRINT(Title, Type, Value, Location) \
 do {                                                   \
 # define YY_SYMBOL_PRINT(Title, Type, Value, Location) \
 do {                                                   \

-  if (debug_)                                          \
+  if (yydebug_)                                                \

     {                                                  \
     {                                                  \

-      cdebug_ << (Title) << ' ';                       \
-      symprint_ ((Type), (Value), (Location));         \
-      cdebug_ << std::endl;                            \
+      *yycdebug_ << (Title) << ' ';                    \
+      yysymprint_ ((Type), (Value), (Location));       \
+      *yycdebug_ << std::endl;                         \

     }                                                  \
 } while (0)
 
 # define YY_REDUCE_PRINT(Rule)         \
 do {                                   \
     }                                                  \
 } while (0)
 
 # define YY_REDUCE_PRINT(Rule)         \
 do {                                   \

-  if (debug_)                          \
-    reduce_print_ (Rule);              \
+  if (yydebug_)                                \
+    yyreduce_print_ (Rule);            \

 } while (0)
 
 # define YY_STACK_PRINT()              \
 do {                                   \
 } while (0)
 
 # define YY_STACK_PRINT()              \
 do {                                   \

-  if (debug_)                          \
-    stack_print_ ();                   \
+  if (yydebug_)                                \
+    yystack_print_ ();                 \

 } while (0)
 
 #else /* !YYDEBUG */
 
 } while (0)
 
 #else /* !YYDEBUG */
 

-# define YYCDEBUG    if (0) cdebug_

 # define YY_SYMBOL_PRINT(Title, Type, Value, Location)
 # define YY_REDUCE_PRINT(Rule)
 # define YY_STACK_PRINT()
 # define YY_SYMBOL_PRINT(Title, Type, Value, Location)
 # define YY_REDUCE_PRINT(Rule)
 # define YY_STACK_PRINT()


@@ -386,37 +365,82 @@ do {                                      \
 #define YYABORT                goto yyabortlab
 #define YYERROR                goto yyerrorlab
 
 #define YYABORT                goto yyabortlab
 #define YYERROR                goto yyerrorlab
 

+#if YYERROR_VERBOSE
+
+/* Return YYSTR after stripping away unnecessary quotes and
+   backslashes, so that it's suitable for yyerror.  The heuristic is
+   that double-quoting is unnecessary unless the string contains an
+   apostrophe, a comma, or backslash (other than backslash-backslash).
+   YYSTR is taken from yytname.  */
+std::string
+yy::]b4_parser_class_name[::yytnamerr_ (const char *yystr)
+{
+  if (*yystr == '"')
+    {
+      std::string yyr = "";
+      char const *yyp = yystr;
+
+      for (;;)
+       switch (*++yyp)
+         {
+         case '\'':
+         case ',':
+           goto do_not_strip_quotes;
+
+         case '\\':
+           if (*++yyp != '\\')
+             goto do_not_strip_quotes;
+           /* Fall through.  */
+         default:
+           yyr += *yyp;
+           break;
+
+         case '"':
+           return yyr;
+         }
+    do_not_strip_quotes: ;
+    }
+
+  return yystr;
+}
+
+#endif
+

 #if YYDEBUG
 /*--------------------------------.
 | Print this symbol on YYOUTPUT.  |
 `--------------------------------*/
 
 void
 #if YYDEBUG
 /*--------------------------------.
 | Print this symbol on YYOUTPUT.  |
 `--------------------------------*/
 
 void

-yy::]b4_parser_class_name[::symprint_ (int yytype,
-                         const SemanticType *yyvaluep, const LocationType *yylocationp)
+yy::]b4_parser_class_name[::yysymprint_ (int yytype,
+                         const semantic_type* yyvaluep, const location_type* yylocationp)

 {
   /* Pacify ``unused variable'' warnings.  */
   (void) yyvaluep;
   (void) yylocationp;
 {
   /* Pacify ``unused variable'' warnings.  */
   (void) yyvaluep;
   (void) yylocationp;

+  /* Backward compatibility, but should be removed eventually. */
+  std::ostream& cdebug_ = *yycdebug_;
+  (void) cdebug_;

 
 

-  cdebug_ << (yytype < ntokens_ ? "token" : "nterm")
-         << ' ' << name_[yytype] << " ("
-          << *yylocationp << ": ";
+  *yycdebug_ << (yytype < yyntokens_ ? "token" : "nterm")
+            << ' ' << yytname_[yytype] << " ("
+             << *yylocationp << ": ";

   switch (yytype)
     {
 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
 [      default:
         break;
     }
   switch (yytype)
     {
 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
 [      default:
         break;
     }

-  cdebug_ << ')';
+  *yycdebug_ << ')';

 }
 #endif /* ! YYDEBUG */
 
 void
 }
 #endif /* ! YYDEBUG */
 
 void

-yy::]b4_parser_class_name[::destruct_ (const char *yymsg,
-                         int yytype, SemanticType *yyvaluep, LocationType *yylocationp)
+yy::]b4_parser_class_name[::yydestruct_ (const char* yymsg,
+                         int yytype, semantic_type* yyvaluep, location_type* yylocationp)

 {
   /* Pacify ``unused variable'' warnings.  */
 {
   /* Pacify ``unused variable'' warnings.  */

+  (void) yymsg;

   (void) yyvaluep;
   (void) yylocationp;
 
   (void) yyvaluep;
   (void) yylocationp;
 


@@ -431,117 +455,175 @@ yy::]b4_parser_class_name[::destruct_ (const char *yymsg,
 }
 
 void
 }
 
 void

-yy::]b4_parser_class_name[::pop (unsigned int n)
+yy::]b4_parser_class_name[::yypop_ (unsigned int n)

 {
 {

-  state_stack_.pop (n);
-  semantic_stack_.pop (n);
-  location_stack_.pop (n);
+  yystate_stack_.pop (n);
+  yysemantic_stack_.pop (n);
+  yylocation_stack_.pop (n);

 }
 
 }
 

+std::ostream&
+yy::]b4_parser_class_name[::debug_stream () const
+{
+  return *yycdebug_;
+}
+
+void
+yy::]b4_parser_class_name[::set_debug_stream (std::ostream& o)
+{
+  yycdebug_ = &o;
+}
+
+
+yy::]b4_parser_class_name[::debug_level_type
+yy::]b4_parser_class_name[::debug_level () const
+{
+  return yydebug_;
+}
+
+void
+yy::]b4_parser_class_name[::set_debug_level (debug_level_type l)
+{
+  yydebug_ = l;
+}
+
+

 int
 yy::]b4_parser_class_name[::parse ()
 {
 int
 yy::]b4_parser_class_name[::parse ()
 {

-  nerrs_ = 0;
-  errstatus_ = 0;
+  /// Look-ahead and look-ahead in internal form.
+  int yychar;
+  int yytoken;
+
+  /// Semantic value of the look-ahead.
+  semantic_type yylval;
+  /// Location of the look-ahead.
+  location_type yylloc;
+  /// The locations where the error started and ended.
+  location yyerror_range[2];
+
+  /// $$.
+  semantic_type yyval;
+  /// @@$.
+  location_type yyloc;
+
+  int yyresult_;

 
 

-  /* Initialize the stacks.  The initial state will be pushed in
+  YYCDEBUG << "Starting parse" << std::endl;
+
+  yynerrs_ = 0;
+  yyerrstatus_ = 0;
+
+  /* Start.  */
+  yystate_ = 0;
+  yychar = yyempty_;
+
+]m4_ifdef([b4_initial_action], [
+m4_pushdef([b4_at_dollar],     [yylloc])dnl
+m4_pushdef([b4_dollar_dollar], [yylval])dnl
+  /* User initialization code. */
+  b4_initial_action
+m4_popdef([b4_dollar_dollar])dnl
+m4_popdef([b4_at_dollar])dnl
+/* Line __line__ of yacc.c.  */
+b4_syncline([@oline@], [@ofile@])])dnl
+
+[  /* Initialize the stacks.  The initial state will be pushed in

      yynewstate, since the latter expects the semantical and the
      location values to have been already stored, initialize these
      stacks with a primary value.  */
      yynewstate, since the latter expects the semantical and the
      location values to have been already stored, initialize these
      stacks with a primary value.  */

-  state_stack_ = StateStack (0);
-  semantic_stack_ = SemanticStack (1);
-  location_stack_ = LocationStack (1);
-
-  /* Start.  */
-  state_ = 0;
-  looka_ = empty_;
-#if YYLSP_NEEDED
-  location = initlocation_;
-#endif
-  YYCDEBUG << "Starting parse" << std::endl;
+  yystate_stack_ = state_stack_type (0);
+  yysemantic_stack_ = semantic_stack_type (0);
+  yylocation_stack_ = location_stack_type (0);
+  yysemantic_stack_.push (yylval);
+  yylocation_stack_.push (yylloc);

 
   /* New state.  */
 yynewstate:
 
   /* New state.  */
 yynewstate:

-  state_stack_.push (state_);
-  YYCDEBUG << "Entering state " << state_ << std::endl;
+  yystate_stack_.push (yystate_);
+  YYCDEBUG << "Entering state " << yystate_ << std::endl;

   goto yybackup;
 
   /* Backup.  */
 yybackup:
 
   /* Try to take a decision without look-ahead.  */
   goto yybackup;
 
   /* Backup.  */
 yybackup:
 
   /* Try to take a decision without look-ahead.  */

-  n_ = pact_[state_];
-  if (n_ == pact_ninf_)
+  yyn_ = yypact_[yystate_];
+  if (yyn_ == yypact_ninf_)

     goto yydefault;
 
   /* Read a look-ahead token.  */
     goto yydefault;
 
   /* Read a look-ahead token.  */

-  if (looka_ == empty_)
+  if (yychar == yyempty_)

     {
       YYCDEBUG << "Reading a token: ";
     {
       YYCDEBUG << "Reading a token: ";

-      lex_ ();
+      yychar = ]b4_c_function_call([yylex], [int],
+[[YYSTYPE*], [&yylval]][]dnl
+b4_location_if([, [[location*], [&yylloc]]])dnl
+m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;

     }
 
     }
 

+

   /* Convert token to internal form.  */
   /* Convert token to internal form.  */

-  if (looka_ <= eof_)
+  if (yychar <= yyeof_)

     {
     {

-      looka_ = ilooka_ = eof_;
+      yychar = yytoken = yyeof_;

       YYCDEBUG << "Now at end of input." << std::endl;
     }
   else
     {
       YYCDEBUG << "Now at end of input." << std::endl;
     }
   else
     {

-      ilooka_ = translate_ (looka_);
-      YY_SYMBOL_PRINT ("Next token is", ilooka_, &value, &location);
+      yytoken = yytranslate_ (yychar);
+      YY_SYMBOL_PRINT ("Next token is", yytoken, &yylval, &yylloc);

     }
 
   /* If the proper action on seeing token ILOOKA_ is to reduce or to
      detect an error, take that action.  */
     }
 
   /* If the proper action on seeing token ILOOKA_ is to reduce or to
      detect an error, take that action.  */

-  n_ += ilooka_;
-  if (n_ < 0 || last_ < n_ || check_[n_] != ilooka_)
+  yyn_ += yytoken;
+  if (yyn_ < 0 || yylast_ < yyn_ || yycheck_[yyn_] != yytoken)

     goto yydefault;
 
   /* Reduce or error.  */
     goto yydefault;
 
   /* Reduce or error.  */

-  n_ = table_[n_];
-  if (n_ < 0)
+  yyn_ = yytable_[yyn_];
+  if (yyn_ < 0)

     {
     {

-      if (n_ == table_ninf_)
+      if (yyn_ == yytable_ninf_)

        goto yyerrlab;
       else
        {
        goto yyerrlab;
       else
        {

-         n_ = -n_;
+         yyn_ = -yyn_;

          goto yyreduce;
        }
     }
          goto yyreduce;
        }
     }

-  else if (n_ == 0)
+  else if (yyn_ == 0)

     goto yyerrlab;
 
   /* Accept?  */
     goto yyerrlab;
 
   /* Accept?  */

-  if (n_ == final_)
+  if (yyn_ == yyfinal_)

     goto yyacceptlab;
 
   /* Shift the look-ahead token.  */
     goto yyacceptlab;
 
   /* Shift the look-ahead token.  */

-  YY_SYMBOL_PRINT ("Shifting", ilooka_, &value, &location);
+  YY_SYMBOL_PRINT ("Shifting", yytoken, &yylval, &yylloc);

 
   /* Discard the token being shifted unless it is eof.  */
 
   /* Discard the token being shifted unless it is eof.  */

-  if (looka_ != eof_)
-    looka_ = empty_;
+  if (yychar != yyeof_)
+    yychar = yyempty_;

 
 

-  semantic_stack_.push (value);
-  location_stack_.push (location);
+  yysemantic_stack_.push (yylval);
+  yylocation_stack_.push (yylloc);

 
   /* Count tokens shifted since error; after three, turn off error
      status.  */
 
   /* Count tokens shifted since error; after three, turn off error
      status.  */

-  if (errstatus_)
-    --errstatus_;
+  if (yyerrstatus_)
+    --yyerrstatus_;

 
 

-  state_ = n_;
+  yystate_ = yyn_;

   goto yynewstate;
 
 /*-----------------------------------------------------------.
 | yydefault -- do the default action for the current state.  |
 `-----------------------------------------------------------*/
 yydefault:
   goto yynewstate;
 
 /*-----------------------------------------------------------.
 | yydefault -- do the default action for the current state.  |
 `-----------------------------------------------------------*/
 yydefault:

-  n_ = defact_[state_];
-  if (n_ == 0)
+  yyn_ = yydefact_[yystate_];
+  if (yyn_ == 0)

     goto yyerrlab;
   goto yyreduce;
 
     goto yyerrlab;
   goto yyreduce;
 


@@ -549,52 +631,47 @@ yydefault:
 | yyreduce -- Do a reduction.  |
 `-----------------------------*/
 yyreduce:
 | yyreduce -- Do a reduction.  |
 `-----------------------------*/
 yyreduce:

-  len_ = r2_[n_];
+  yylen_ = yyr2_[yyn_];

   /* If LEN_ is nonzero, implement the default value of the action:
      `$$ = $1'.  Otherwise, use the top of the stack.
 
      Otherwise, the following line sets YYVAL to garbage.
      This behavior is undocumented and Bison
      users should not rely upon it.  */
   /* If LEN_ is nonzero, implement the default value of the action:
      `$$ = $1'.  Otherwise, use the top of the stack.
 
      Otherwise, the following line sets YYVAL to garbage.
      This behavior is undocumented and Bison
      users should not rely upon it.  */

-  if (len_)
-    {
-      yyval = semantic_stack_[len_ - 1];
-      yyloc = location_stack_[len_ - 1];
-    }
+  if (yylen_)
+    yyval = yysemantic_stack_[yylen_ - 1];

   else
   else

-    {
-      yyval = semantic_stack_[0];
-      yyloc = location_stack_[0];
-    }
+    yyval = yysemantic_stack_[0];

 
 

-  if (len_)
-    {
-      Slice< LocationType, LocationStack > slice (location_stack_, len_);
-      YYLLOC_DEFAULT (yyloc, slice, len_);
-    }
-  YY_REDUCE_PRINT (n_);
-  switch (n_)
+  {
+    slice<location_type, location_stack_type> slice (yylocation_stack_, yylen_);
+    YYLLOC_DEFAULT (yyloc, slice, yylen_);
+  }
+  YY_REDUCE_PRINT (yyn_);
+  switch (yyn_)

     {
       ]b4_actions[
     {
       ]b4_actions[

+      default: break;

     }
 
 ]/* Line __line__ of lalr1.cc.  */
 b4_syncline([@oline@], [@ofile@])[
 
     }
 
 ]/* Line __line__ of lalr1.cc.  */
 b4_syncline([@oline@], [@ofile@])[
 

-  pop (len_);
+  yypop_ (yylen_);

 
   YY_STACK_PRINT ();
 
 
   YY_STACK_PRINT ();
 

-  semantic_stack_.push (yyval);
-  location_stack_.push (yyloc);
+  yysemantic_stack_.push (yyval);
+  yylocation_stack_.push (yyloc);

 
   /* Shift the result of the reduction.  */
 
   /* Shift the result of the reduction.  */

-  n_ = r1_[n_];
-  state_ = pgoto_[n_ - ntokens_] + state_stack_[0];
-  if (0 <= state_ && state_ <= last_ && check_[state_] == state_stack_[0])
-    state_ = table_[state_];
+  yyn_ = yyr1_[yyn_];
+  yystate_ = yypgoto_[yyn_ - yyntokens_] + yystate_stack_[0];
+  if (0 <= yystate_ && yystate_ <= yylast_
+      && yycheck_[yystate_] == yystate_stack_[0])
+    yystate_ = yytable_[yystate_];

   else
   else

-    state_ = defgoto_[n_ - ntokens_];
+    yystate_ = yydefgoto_[yyn_ - yyntokens_];

   goto yynewstate;
 
 /*------------------------------------.
   goto yynewstate;
 
 /*------------------------------------.


@@ -602,36 +679,28 @@ b4_syncline([@oline@], [@ofile@])[
 `------------------------------------*/
 yyerrlab:
   /* If not already recovering from an error, report this error.  */
 `------------------------------------*/
 yyerrlab:
   /* If not already recovering from an error, report this error.  */

-  report_syntax_error_ ();
+  if (!yyerrstatus_)
+    {
+      ++yynerrs_;
+      error (yylloc, yysyntax_error_ (YYERROR_VERBOSE_IF (yytoken)));
+    }

 
 

-  error_start_ = location.begin;
-  if (errstatus_ == 3)
+  yyerror_range[0] = yylloc;
+  if (yyerrstatus_ == 3)

     {
       /* If just tried and failed to reuse look-ahead token after an
         error, discard it.  */
 
     {
       /* If just tried and failed to reuse look-ahead token after an
         error, discard it.  */
 

-      /* Return failure if at end of input.  */
-      if (looka_ <= eof_)
+      if (yychar <= yyeof_)

         {
         {

-          /* If at end of input, pop the error token,
-            then the rest of the stack, then return failure.  */
-         if (looka_ == eof_)
-            for (;;)
-              {
-                 error_start_ = location_stack_[0].begin;
-                 pop ();
-                if (state_stack_.height () == 1)
-                  YYABORT;
-                 destruct_ ("Error: popping",
-                            stos_[state_stack_[0]],
-                            &semantic_stack_[0],
-                            &location_stack_[0]);
-              }
+         /* Return failure if at end of input.  */
+         if (yychar == yyeof_)
+           YYABORT;

         }
       else
         {
         }
       else
         {

-          destruct_ ("Error: discarding", ilooka_, &value, &location);
-          looka_ = empty_;
+          yydestruct_ ("Error: discarding", yytoken, &yylval, &yylloc);
+          yychar = yyempty_;

         }
     }
 
         }
     }
 


@@ -645,136 +714,147 @@ yyerrlab:
 `---------------------------------------------------*/
 yyerrorlab:
 
 `---------------------------------------------------*/
 yyerrorlab:
 

-#ifdef __GNUC__
-  /* Pacify GCC when the user code never invokes YYERROR and the label
-     yyerrorlab therefore never appears in user code.  */
-  if (0)
-     goto yyerrorlab;
-#endif
+  /* Pacify compilers like GCC when the user code never invokes
+     YYERROR and the label yyerrorlab therefore never appears in user
+     code.  */
+  if (false)
+    goto yyerrorlab;

 
 

-  error_start_ = location_stack_[len_ - 1].begin;
-  pop (len_);
-  state_ = state_stack_[0];
+  yyerror_range[0] = yylocation_stack_[yylen_ - 1];
+  yypop_ (yylen_);
+  yystate_ = yystate_stack_[0];

   goto yyerrlab1;
 
 /*-------------------------------------------------------------.
 | yyerrlab1 -- common code for both syntax error and YYERROR.  |
 `-------------------------------------------------------------*/
 yyerrlab1:
   goto yyerrlab1;
 
 /*-------------------------------------------------------------.
 | yyerrlab1 -- common code for both syntax error and YYERROR.  |
 `-------------------------------------------------------------*/
 yyerrlab1:

-  errstatus_ = 3;      /* Each real token shifted decrements this.  */
+  yyerrstatus_ = 3;    /* Each real token shifted decrements this.  */

 
   for (;;)
     {
 
   for (;;)
     {

-      n_ = pact_[state_];
-      if (n_ != pact_ninf_)
+      yyn_ = yypact_[yystate_];
+      if (yyn_ != yypact_ninf_)

        {
        {

-         n_ += terror_;
-         if (0 <= n_ && n_ <= last_ && check_[n_] == terror_)
+         yyn_ += yyterror_;
+         if (0 <= yyn_ && yyn_ <= yylast_ && yycheck_[yyn_] == yyterror_)

            {
            {

-             n_ = table_[n_];
-             if (0 < n_)
+             yyn_ = yytable_[yyn_];
+             if (0 < yyn_)

                break;
            }
        }
 
       /* Pop the current state because it cannot handle the error token.  */
                break;
            }
        }
 
       /* Pop the current state because it cannot handle the error token.  */

-      if (state_stack_.height () == 1)
+      if (yystate_stack_.height () == 1)

        YYABORT;
 
        YYABORT;
 

-      destruct_ ("Error: popping",
-                 stos_[state_], &semantic_stack_[0], &location_stack_[0]);
-      error_start_ = location_stack_[0].begin;
-
-      pop ();
-      state_ = state_stack_[0];
+      yyerror_range[0] = yylocation_stack_[0];
+      yydestruct_ ("Error: popping",
+                   yystos_[yystate_],
+                   &yysemantic_stack_[0], &yylocation_stack_[0]);
+      yypop_ ();
+      yystate_ = yystate_stack_[0];

       YY_STACK_PRINT ();
     }
 
       YY_STACK_PRINT ();
     }
 

-  if (n_ == final_)
+  if (yyn_ == yyfinal_)

     goto yyacceptlab;
 
     goto yyacceptlab;
 

-  {
-    Location errloc;
-    errloc.begin = error_start_;
-    errloc.end = location.end;
-    semantic_stack_.push (value);
-    location_stack_.push (errloc);
-  }
+  yyerror_range[1] = yylloc;
+  // Using YYLLOC is tempting, but would change the location of
+  // the look-ahead.  YYLOC is available though.
+  YYLLOC_DEFAULT (yyloc, yyerror_range - 1, 2);
+  yysemantic_stack_.push (yylval);
+  yylocation_stack_.push (yyloc);

 
   /* Shift the error token. */
 
   /* Shift the error token. */

-  YY_SYMBOL_PRINT ("Shifting", stos_[n_],
-                  &semantic_stack_[0], &location_stack_[0]);
+  YY_SYMBOL_PRINT ("Shifting", yystos_[yyn_],
+                  &yysemantic_stack_[0], &yylocation_stack_[0]);

 
 

-  state_ = n_;
+  yystate_ = yyn_;

   goto yynewstate;
 
   /* Accept.  */
 yyacceptlab:
   goto yynewstate;
 
   /* Accept.  */
 yyacceptlab:

-  return 0;
+  yyresult_ = 0;
+  goto yyreturn;

 
   /* Abort.  */
 yyabortlab:
 
   /* Abort.  */
 yyabortlab:

-  /* Free the lookahead. */
-  destruct_ ("Error: discarding lookahead", ilooka_, &value, &location);
-  looka_ = empty_;
-  return 1;
-}
+  yyresult_ = 1;
+  goto yyreturn;

 
 

-void
-yy::]b4_parser_class_name[::lex_ ()
-{
-#if YYLSP_NEEDED
-  looka_ = yylex (&value, &location);
-#else
-  looka_ = yylex (&value);
-#endif
-}
+yyreturn:
+  if (yychar != yyeof_ && yychar != yyempty_)
+    yydestruct_ ("Cleanup: discarding lookahead", yytoken, &yylval, &yylloc);

 
 

-/** Generate an error message, and invoke yyerror. */
-void
-yy::]b4_parser_class_name[::report_syntax_error_ ()
-{
-  /* If not already recovering from an error, report this error.  */
-  if (!errstatus_)
+  while (yystate_stack_.height () != 1)

     {
     {

-      ++nerrs_;
+      yydestruct_ ("Cleanup: popping",
+                  yystos_[yystate_stack_[0]],
+                  &yysemantic_stack_[0],
+                  &yylocation_stack_[0]);
+      yypop_ ();
+    }

 
 

+  return yyresult_;
+}
+
+// Generate an error message.
+std::string
+yy::]b4_parser_class_name[::yysyntax_error_ (YYERROR_VERBOSE_IF (int tok))
+{
+  std::string res;

 #if YYERROR_VERBOSE
 #if YYERROR_VERBOSE

-      n_ = pact_[state_];
-      if (pact_ninf_ < n_ && n_ < last_)
-       {
-         message = "syntax error, unexpected ";
-         message += name_[ilooka_];
-         {
-           int count = 0;
-           for (int x = (n_ < 0 ? -n_ : 0); x < ntokens_ + nnts_; ++x)
-             if (check_[x + n_] == x && x != terror_)
-               ++count;
-           if (count < 5)
-             {
-               count = 0;
-               for (int x = (n_ < 0 ? -n_ : 0); x < ntokens_ + nnts_; ++x)
-                 if (check_[x + n_] == x && x != terror_)
-                   {
-                     message += (!count++) ? ", expecting " : " or ";
-                     message += name_[x];
-                   }
-             }
-         }
-       }
-      else
-#endif
-       message = "syntax error";
-      error_ ();
+  yyn_ = yypact_[yystate_];
+  if (yypact_ninf_ < yyn_ && yyn_ < yylast_)
+    {
+      /* Start YYX at -YYN if negative to avoid negative indexes in
+         YYCHECK.  */
+      int yyxbegin = yyn_ < 0 ? -yyn_ : 0;
+
+      /* Stay within bounds of both yycheck and yytname.  */
+      int yychecklim = yylast_ - yyn_;
+      int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
+      int count = 0;
+      for (int x = yyxbegin; x < yyxend; ++x)
+        if (yycheck_[x + yyn_] == x && x != yyterror_)
+          ++count;
+
+      // FIXME: This method of building the message is not compatible
+      // with internationalization.  It should work like yacc.c does it.
+      // That is, first build a string that looks like this:
+      // "syntax error, unexpected %s or %s or %s"
+      // Then, invoke YY_ on this string.
+      // Finally, use the string as a format to output
+      // yytname_[tok], etc.
+      // Until this gets fixed, this message appears in English only.
+      res = "syntax error, unexpected ";
+      res += yytnamerr_ (yytname_[tok]);
+      if (count < 5)
+        {
+          count = 0;
+          for (int x = yyxbegin; x < yyxend; ++x)
+            if (yycheck_[x + yyn_] == x && x != yyterror_)
+              {
+                res += (!count++) ? ", expecting " : " or ";
+                res += yytnamerr_ (yytname_[x]);
+              }
+        }

     }
     }

+  else
+#endif
+    res = YY_("syntax error");
+  return res;

 }
 
 
 /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
    STATE-NUM.  */
 }
 
 
 /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
    STATE-NUM.  */

-const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) yy::b4_parser_class_name::pact_ninf_ = b4_pact_ninf[;
+const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) yy::b4_parser_class_name::yypact_ninf_ = b4_pact_ninf[;

 const ]b4_int_type_for([b4_pact])[
 const ]b4_int_type_for([b4_pact])[

-yy::]b4_parser_class_name[::pact_[] =
+yy::]b4_parser_class_name[::yypact_[] =

 {
   ]b4_pact[
 };
 {
   ]b4_pact[
 };


@@ -783,21 +863,21 @@ yy::]b4_parser_class_name[::pact_[] =
    doesn't specify something else to do.  Zero means the default is an
    error.  */
 const ]b4_int_type_for([b4_defact])[
    doesn't specify something else to do.  Zero means the default is an
    error.  */
 const ]b4_int_type_for([b4_defact])[

-yy::]b4_parser_class_name[::defact_[] =
+yy::]b4_parser_class_name[::yydefact_[] =

 {
   ]b4_defact[
 };
 
 /* YYPGOTO[NTERM-NUM].  */
 const ]b4_int_type_for([b4_pgoto])[
 {
   ]b4_defact[
 };
 
 /* YYPGOTO[NTERM-NUM].  */
 const ]b4_int_type_for([b4_pgoto])[

-yy::]b4_parser_class_name[::pgoto_[] =
+yy::]b4_parser_class_name[::yypgoto_[] =

 {
   ]b4_pgoto[
 };
 
 /* YYDEFGOTO[NTERM-NUM].  */
 const ]b4_int_type_for([b4_defgoto])[
 {
   ]b4_pgoto[
 };
 
 /* YYDEFGOTO[NTERM-NUM].  */
 const ]b4_int_type_for([b4_defgoto])[

-yy::]b4_parser_class_name[::defgoto_[] =
+yy::]b4_parser_class_name[::yydefgoto_[] =

 {
   ]b4_defgoto[
 };
 {
   ]b4_defgoto[
 };


@@ -805,16 +885,16 @@ yy::]b4_parser_class_name[::defgoto_[] =
 /* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
    positive, shift that token.  If negative, reduce the rule which
    number is the opposite.  If zero, do what YYDEFACT says.  */
 /* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
    positive, shift that token.  If negative, reduce the rule which
    number is the opposite.  If zero, do what YYDEFACT says.  */

-const ]b4_int_type(b4_table_ninf, b4_table_ninf) yy::b4_parser_class_name::table_ninf_ = b4_table_ninf[;
+const ]b4_int_type(b4_table_ninf, b4_table_ninf) yy::b4_parser_class_name::yytable_ninf_ = b4_table_ninf[;

 const ]b4_int_type_for([b4_table])[
 const ]b4_int_type_for([b4_table])[

-yy::]b4_parser_class_name[::table_[] =
+yy::]b4_parser_class_name[::yytable_[] =

 {
   ]b4_table[
 };
 
 /* YYCHECK.  */
 const ]b4_int_type_for([b4_check])[
 {
   ]b4_table[
 };
 
 /* YYCHECK.  */
 const ]b4_int_type_for([b4_check])[

-yy::]b4_parser_class_name[::check_[] =
+yy::]b4_parser_class_name[::yycheck_[] =

 {
   ]b4_check[
 };
 {
   ]b4_check[
 };


@@ -822,16 +902,16 @@ yy::]b4_parser_class_name[::check_[] =
 /* STOS_[STATE-NUM] -- The (internal number of the) accessing
    symbol of state STATE-NUM.  */
 const ]b4_int_type_for([b4_stos])[
 /* STOS_[STATE-NUM] -- The (internal number of the) accessing
    symbol of state STATE-NUM.  */
 const ]b4_int_type_for([b4_stos])[

-yy::]b4_parser_class_name[::stos_[] =
+yy::]b4_parser_class_name[::yystos_[] =

 {
   ]b4_stos[
 };
 
 #if YYDEBUG
 {
   ]b4_stos[
 };
 
 #if YYDEBUG

-/* TOKEN_NUMBER_[YYLEX-NUM] -- Internal token number corresponding
+/* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding

    to YYLEX-NUM.  */
 const ]b4_int_type_for([b4_toknum])[
    to YYLEX-NUM.  */
 const ]b4_int_type_for([b4_toknum])[

-yy::]b4_parser_class_name[::token_number_[] =
+yy::]b4_parser_class_name[::yytoken_number_[] =

 {
   ]b4_toknum[
 };
 {
   ]b4_toknum[
 };


@@ -839,23 +919,23 @@ yy::]b4_parser_class_name[::token_number_[] =
 
 /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
 const ]b4_int_type_for([b4_r1])[
 
 /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
 const ]b4_int_type_for([b4_r1])[

-yy::]b4_parser_class_name[::r1_[] =
+yy::]b4_parser_class_name[::yyr1_[] =

 {
   ]b4_r1[
 };
 
 /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
 const ]b4_int_type_for([b4_r2])[
 {
   ]b4_r1[
 };
 
 /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
 const ]b4_int_type_for([b4_r2])[

-yy::]b4_parser_class_name[::r2_[] =
+yy::]b4_parser_class_name[::yyr2_[] =

 {
   ]b4_r2[
 };
 
 {
   ]b4_r2[
 };
 

-#if YYDEBUG || YYERROR_VERBOSE
+#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE

 /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
 /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.

-   First, the terminals, then, starting at NTOKENS_, nonterminals. */
+   First, the terminals, then, starting at \a yyntokens_, nonterminals. */

 const char*
 const char*

-const yy::]b4_parser_class_name[::name_[] =
+const yy::]b4_parser_class_name[::yytname_[] =

 {
   ]b4_tname[
 };
 {
   ]b4_tname[
 };


@@ -863,8 +943,8 @@ const yy::]b4_parser_class_name[::name_[] =
 
 #if YYDEBUG
 /* YYRHS -- A `-1'-separated list of the rules' RHS. */
 
 #if YYDEBUG
 /* YYRHS -- A `-1'-separated list of the rules' RHS. */

-const yy::]b4_parser_class_name[::RhsNumberType
-yy::]b4_parser_class_name[::rhs_[] =
+const yy::]b4_parser_class_name[::rhs_number_type
+yy::]b4_parser_class_name[::yyrhs_[] =

 {
   ]b4_rhs[
 };
 {
   ]b4_rhs[
 };


@@ -872,77 +952,76 @@ yy::]b4_parser_class_name[::rhs_[] =
 /* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
    YYRHS.  */
 const ]b4_int_type_for([b4_prhs])[
 /* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
    YYRHS.  */
 const ]b4_int_type_for([b4_prhs])[

-yy::]b4_parser_class_name[::prhs_[] =
+yy::]b4_parser_class_name[::yyprhs_[] =

 {
   ]b4_prhs[
 };
 
 {
   ]b4_prhs[
 };
 

-/* YYRLINE[YYN] -- source line where rule number YYN was defined.  */
+/* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */

 const ]b4_int_type_for([b4_rline])[
 const ]b4_int_type_for([b4_rline])[

-yy::]b4_parser_class_name[::rline_[] =
+yy::]b4_parser_class_name[::yyrline_[] =

 {
   ]b4_rline[
 };
 
 {
   ]b4_rline[
 };
 

-/** Print the state stack from its BOTTOM up to its TOP (included).  */
-
+// Print the state stack on the debug stream.

 void
 void

-yy::]b4_parser_class_name[::stack_print_ ()
+yy::]b4_parser_class_name[::yystack_print_ ()

 {
 {

-  cdebug_ << "state stack now";
-  for (StateStack::ConstIterator i = state_stack_.begin ();
-       i != state_stack_.end (); ++i)
-    cdebug_ << ' ' << *i;
-  cdebug_ << std::endl;
+  *yycdebug_ << "Stack now";
+  for (state_stack_type::const_iterator i = yystate_stack_.begin ();
+       i != yystate_stack_.end (); ++i)
+    *yycdebug_ << ' ' << *i;
+  *yycdebug_ << std::endl;

 }
 
 }
 

-/** Report that the YYRULE is going to be reduced.  */
-
+// Report on the debug stream that the rule \a yyrule is going to be reduced.

 void
 void

-yy::]b4_parser_class_name[::reduce_print_ (int yyrule)
+yy::]b4_parser_class_name[::yyreduce_print_ (int yyrule)

 {
 {

-  unsigned int yylno = rline_[yyrule];
+  unsigned int yylno = yyrline_[yyrule];

   /* Print the symbols being reduced, and their result.  */
   /* Print the symbols being reduced, and their result.  */

-  cdebug_ << "Reducing via rule " << n_ - 1 << " (line " << yylno << "), ";
-  for (]b4_int_type_for([b4_prhs])[ i = prhs_[n_];
-       0 <= rhs_[i]; ++i)
-    cdebug_ << name_[rhs_[i]] << ' ';
-  cdebug_ << "-> " << name_[r1_[n_]] << std::endl;
+  *yycdebug_ << "Reducing stack by rule " << yyn_ - 1
+             << " (line " << yylno << "), ";
+  for (]b4_int_type_for([b4_prhs])[ i = yyprhs_[yyn_];
+       0 <= yyrhs_[i]; ++i)
+    *yycdebug_ << yytname_[yyrhs_[i]] << ' ';
+  *yycdebug_ << "-> " << yytname_[yyr1_[yyn_]] << std::endl;

 }
 #endif // YYDEBUG
 
 /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
 }
 #endif // YYDEBUG
 
 /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */

-yy::]b4_parser_class_name[::TokenNumberType
-yy::]b4_parser_class_name[::translate_ (int token)
+yy::]b4_parser_class_name[::token_number_type
+yy::]b4_parser_class_name[::yytranslate_ (int token)

 {
   static
 {
   static

-  const TokenNumberType
+  const token_number_type

   translate_table[] =
   {
     ]b4_translate[
   };
   translate_table[] =
   {
     ]b4_translate[
   };

-  if ((unsigned int) token <= user_token_number_max_)
+  if ((unsigned int) token <= yyuser_token_number_max_)

     return translate_table[token];
   else
     return translate_table[token];
   else

-    return undef_token_;
+    return yyundef_token_;

 }
 
 }
 

-const int yy::]b4_parser_class_name[::eof_ = 0;
-const int yy::]b4_parser_class_name[::last_ = ]b4_last[;
-const int yy::]b4_parser_class_name[::nnts_ = ]b4_nterms_number[;
-const int yy::]b4_parser_class_name[::empty_ = -2;
-const int yy::]b4_parser_class_name[::final_ = ]b4_final_state_number[;
-const int yy::]b4_parser_class_name[::terror_ = 1;
-const int yy::]b4_parser_class_name[::errcode_ = 256;
-const int yy::]b4_parser_class_name[::ntokens_ = ]b4_tokens_number[;
+const int yy::]b4_parser_class_name[::yyeof_ = 0;
+const int yy::]b4_parser_class_name[::yylast_ = ]b4_last[;
+const int yy::]b4_parser_class_name[::yynnts_ = ]b4_nterms_number[;
+const int yy::]b4_parser_class_name[::yyempty_ = -2;
+const int yy::]b4_parser_class_name[::yyfinal_ = ]b4_final_state_number[;
+const int yy::]b4_parser_class_name[::yyterror_ = 1;
+const int yy::]b4_parser_class_name[::yyerrcode_ = 256;
+const int yy::]b4_parser_class_name[::yyntokens_ = ]b4_tokens_number[;

 
 

-const unsigned int yy::]b4_parser_class_name[::user_token_number_max_ = ]b4_user_token_number_max[;
-const yy::]b4_parser_class_name[::TokenNumberType yy::]b4_parser_class_name[::undef_token_ = ]b4_undef_token_number[;
+const unsigned int yy::]b4_parser_class_name[::yyuser_token_number_max_ = ]b4_user_token_number_max[;
+const yy::]b4_parser_class_name[::token_number_type yy::]b4_parser_class_name[::yyundef_token_ = ]b4_undef_token_number[;

 
 ]b4_epilogue
 dnl
 @output stack.hh
 
 ]b4_epilogue
 dnl
 @output stack.hh

-b4_copyright([Stack handling for Bison C++ parsers], [2002, 2003, 2004])[
+b4_copyright([stack handling for Bison C++ parsers], [2002, 2003, 2004, 2005])[

 
 #ifndef BISON_STACK_HH
 # define BISON_STACK_HH
 
 #ifndef BISON_STACK_HH
 # define BISON_STACK_HH


@@ -951,19 +1030,20 @@ b4_copyright([Stack handling for Bison C++ parsers], [2002, 2003, 2004])[
 
 namespace yy
 {
 
 namespace yy
 {

-  template < class T, class S = std::deque< T > >
-  class Stack
+  template <class T, class S = std::deque<T> >
+  class stack

   {
   public:
 
   {
   public:
 

-    typedef typename S::iterator Iterator;
-    typedef typename S::const_iterator ConstIterator;
+    // Hide our reversed order.
+    typedef typename S::reverse_iterator iterator;
+    typedef typename S::const_reverse_iterator const_iterator;

 
 

-    Stack () : seq_ ()
+    stack () : seq_ ()

     {
     }
 
     {
     }
 

-    Stack (unsigned int n) : seq_ (n)
+    stack (unsigned int n) : seq_ (n)

     {
     }
 
     {
     }
 


@@ -1003,20 +1083,21 @@ namespace yy
       return seq_.size ();
     }
 
       return seq_.size ();
     }
 

-    inline ConstIterator begin () const { return seq_.begin (); }
-    inline ConstIterator end () const { return seq_.end (); }
+    inline const_iterator begin () const { return seq_.rbegin (); }
+    inline const_iterator end () const { return seq_.rend (); }

 
   private:
 
     S seq_;
   };
 
 
   private:
 
     S seq_;
   };
 

-  template < class T, class S = Stack< T > >
-  class Slice
+  /// Present a slice of the top of a stack.
+  template <class T, class S = stack<T> >
+  class slice

   {
   public:
 
   {
   public:
 

-    Slice (const S& stack,
+    slice (const S& stack,

           unsigned int range) : stack_ (stack),
                                 range_ (range)
     {
           unsigned int range) : stack_ (stack),
                                 range_ (range)
     {


@@ -1039,11 +1120,11 @@ namespace yy
 #endif // not BISON_STACK_HH]
 dnl
 @output position.hh
 #endif // not BISON_STACK_HH]
 dnl
 @output position.hh

-b4_copyright([Position class for Bison C++ parsers], [2002, 2003, 2004])[
+b4_copyright([Position class for Bison C++ parsers], [2002, 2003, 2004, 2005])[

 
 /**
  ** \file position.hh
 
 /**
  ** \file position.hh

- ** Define the Location class.
+ ** Define the position class.

  */
 
 #ifndef BISON_POSITION_HH
  */
 
 #ifndef BISON_POSITION_HH


@@ -1054,21 +1135,21 @@ b4_copyright([Position class for Bison C++ parsers], [2002, 2003, 2004])[
 
 namespace yy
 {
 
 namespace yy
 {

-  /** \brief Abstract a Position. */
-  class Position
+  /// Abstract a position.
+  class position

   {
   public:
   {
   public:

-    /** \brief Initial column number. */
+    /// Initial column number.

     static const unsigned int initial_column = 0;
     static const unsigned int initial_column = 0;

-    /** \brief Initial line number. */
+    /// Initial line number.

     static const unsigned int initial_line = 1;
 
     /** \name Ctor & dtor.
      ** \{ */
   public:
     static const unsigned int initial_line = 1;
 
     /** \name Ctor & dtor.
      ** \{ */
   public:

-    /** \brief Construct a Position. */
-    Position () :
-      filename (),
+    /// Construct a position.
+    position () :
+      filename (0),

       line (initial_line),
       column (initial_column)
     {
       line (initial_line),
       column (initial_column)
     {


@@ -1079,14 +1160,14 @@ namespace yy
     /** \name Line and Column related manipulators
      ** \{ */
   public:
     /** \name Line and Column related manipulators
      ** \{ */
   public:

-    /** \brief (line related) Advance to the COUNT next lines. */
+    /// (line related) Advance to the COUNT next lines.

     inline void lines (int count = 1)
     {
       column = initial_column;
       line += count;
     }
 
     inline void lines (int count = 1)
     {
       column = initial_column;
       line += count;
     }
 

-    /** \brief (column related) Advance to the COUNT next columns. */
+    /// (column related) Advance to the COUNT next columns.

     inline void columns (int count = 1)
     {
       int leftmost = initial_column;
     inline void columns (int count = 1)
     {
       int leftmost = initial_column;


@@ -1099,64 +1180,64 @@ namespace yy
     /** \} */
 
   public:
     /** \} */
 
   public:

-    /** \brief File name to which this position refers. */
-    std::string filename;
-    /** \brief Current line number. */
+    /// File name to which this position refers.
+    ]b4_filename_type[* filename;
+    /// Current line number.

     unsigned int line;
     unsigned int line;

-    /** \brief Current column number. */
+    /// Current column number.

     unsigned int column;
   };
 
     unsigned int column;
   };
 

-  /** \brief Add and assign a Position. */
-  inline const Position&
-  operator+= (Position& res, const int width)
+  /// Add and assign a position.
+  inline const position&
+  operator+= (position& res, const int width)

   {
     res.columns (width);
     return res;
   }
 
   {
     res.columns (width);
     return res;
   }
 

-  /** \brief Add two Position objects. */
-  inline const Position
-  operator+ (const Position& begin, const int width)
+  /// Add two position objects.
+  inline const position
+  operator+ (const position& begin, const int width)

   {
   {

-    Position res = begin;
+    position res = begin;

     return res += width;
   }
 
     return res += width;
   }
 

-  /** \brief Add and assign a Position. */
-  inline const Position&
-  operator-= (Position& res, const int width)
+  /// Add and assign a position.
+  inline const position&
+  operator-= (position& res, const int width)

   {
     return res += -width;
   }
 
   {
     return res += -width;
   }
 

-  /** \brief Add two Position objects. */
-  inline const Position
-  operator- (const Position& begin, const int width)
+  /// Add two position objects.
+  inline const position
+  operator- (const position& begin, const int width)

   {
     return begin + -width;
   }
 
   /** \brief Intercept output stream redirection.
    ** \param ostr the destination output stream
   {
     return begin + -width;
   }
 
   /** \brief Intercept output stream redirection.
    ** \param ostr the destination output stream

-   ** \param pos a reference to the Position to redirect
+   ** \param pos a reference to the position to redirect

    */
   inline std::ostream&
    */
   inline std::ostream&

-  operator<< (std::ostream& ostr, const Position& pos)
+  operator<< (std::ostream& ostr, const position& pos)

   {
   {

-    if (!pos.filename.empty ())
-      ostr << pos.filename << ':';
+    if (pos.filename)
+      ostr << *pos.filename << ':';

     return ostr << pos.line << '.' << pos.column;
   }
 
 }
 #endif // not BISON_POSITION_HH]
 @output location.hh
     return ostr << pos.line << '.' << pos.column;
   }
 
 }
 #endif // not BISON_POSITION_HH]
 @output location.hh

-b4_copyright([Location class for Bison C++ parsers], [2002, 2003, 2004])[
+b4_copyright([Location class for Bison C++ parsers], [2002, 2003, 2004, 2005])[

 
 /**
  ** \file location.hh
 
 /**
  ** \file location.hh

- ** Define the Location class.
+ ** Define the location class.

  */
 
 #ifndef BISON_LOCATION_HH
  */
 
 #ifndef BISON_LOCATION_HH


@@ -1169,14 +1250,14 @@ b4_copyright([Location class for Bison C++ parsers], [2002, 2003, 2004])[
 namespace yy
 {
 
 namespace yy
 {
 

-  /** \brief Abstract a Location. */
-  class Location
+  /// Abstract a location.
+  class location

   {
     /** \name Ctor & dtor.
      ** \{ */
   public:
   {
     /** \name Ctor & dtor.
      ** \{ */
   public:

-    /** \brief Construct a Location. */
-    Location (void) :
+    /// Construct a location.
+    location () :

       begin (),
       end ()
     {
       begin (),
       end ()
     {


@@ -1187,19 +1268,19 @@ namespace yy
     /** \name Line and Column related manipulators
      ** \{ */
   public:
     /** \name Line and Column related manipulators
      ** \{ */
   public:

-    /** \brief Reset initial location to final location. */
-    inline void step (void)
+    /// Reset initial location to final location.
+    inline void step ()

     {
       begin = end;
     }
 
     {
       begin = end;
     }
 

-    /** \brief Extend the current location to the COUNT next columns. */
+    /// Extend the current location to the COUNT next columns.

     inline void columns (unsigned int count = 1)
     {
       end += count;
     }
 
     inline void columns (unsigned int count = 1)
     {
       end += count;
     }
 

-    /** \brief Extend the current location to the COUNT next lines. */
+    /// Extend the current location to the COUNT next lines.

     inline void lines (unsigned int count = 1)
     {
       end.lines (count);
     inline void lines (unsigned int count = 1)
     {
       end.lines (count);


@@ -1208,30 +1289,30 @@ namespace yy
 
 
   public:
 
 
   public:

-    /** \brief Beginning of the located region. */
-    Position begin;
-    /** \brief End of the located region. */
-    Position end;
+    /// Beginning of the located region.
+    position begin;
+    /// End of the located region.
+    position end;

   };
 
   };
 

-  /** \brief Join two Location objects to create a Location. */
-  inline const Location operator+ (const Location& begin, const Location& end)
+  /// Join two location objects to create a location.
+  inline const location operator+ (const location& begin, const location& end)

   {
   {

-    Location res = begin;
+    location res = begin;

     res.end = end.end;
     return res;
   }
 
     res.end = end.end;
     return res;
   }
 

-  /** \brief Add two Location objects */
-  inline const Location operator+ (const Location& begin, unsigned int width)
+  /// Add two location objects.
+  inline const location operator+ (const location& begin, unsigned int width)

   {
   {

-    Location res = begin;
+    location res = begin;

     res.columns (width);
     return res;
   }
 
     res.columns (width);
     return res;
   }
 

-  /** \brief Add and assign a Location */
-  inline Location &operator+= (Location& res, unsigned int width)
+  /// Add and assign a location.
+  inline location& operator+= (location& res, unsigned int width)

   {
     res.columns (width);
     return res;
   {
     res.columns (width);
     return res;


@@ -1239,15 +1320,17 @@ namespace yy
 
   /** \brief Intercept output stream redirection.
    ** \param ostr the destination output stream
 
   /** \brief Intercept output stream redirection.
    ** \param ostr the destination output stream

-   ** \param loc a reference to the Location to redirect
+   ** \param loc a reference to the location to redirect

    **
    ** Avoid duplicate information.
    */
    **
    ** Avoid duplicate information.
    */

-  inline std::ostream& operator<< (std::ostream& ostr, const Location& loc)
+  inline std::ostream& operator<< (std::ostream& ostr, const location& loc)

   {
   {

-    Position last = loc.end - 1;
+    position last = loc.end - 1;

     ostr << loc.begin;
     ostr << loc.begin;

-    if (loc.begin.filename != last.filename)
+    if (last.filename
+       && (!loc.begin.filename
+           || *loc.begin.filename != *last.filename))

       ostr << '-' << last;
     else if (loc.begin.line != last.line)
       ostr << '-' << last.line  << '.' << last.column;
       ostr << '-' << last;
     else if (loc.begin.line != last.line)
       ostr << '-' << last.line  << '.' << last.column;