glr2.cc: put glr_state_set and glr_stack_item in unnamed namespace

* data/skeletons/glr2.cc: here.

data/skeletons/glr2.cc

@@ -776,12 +776,15 @@ typedef int state_num;
 /** Rule numbers, as in LALR(1) machine */
 typedef int rule_num;
 
-// Forward declarations.
 namespace
 {
+  using parser_type = ]b4_namespace_ref[::]b4_parser_class[;
+  using glr_state = parser_type::glr_state;
+
+  // Forward declarations.
+  class glr_stack_item;
   class semantic_option;
 }
-class glr_stack_item;
 
 /** Accessing symbol of state YYSTATE.  */
 static inline yysymbol_kind_t
@@ -954,7 +957,7 @@ namespace ]b4_namespace_ref[
     }
   #endif
 
-    std::ptrdiff_t indexIn (const glr_stack_item* array) const;
+    std::ptrdiff_t indexIn (const glr_stack_item* array) const YY_ATTRIBUTE_UNUSED;
 
     glr_stack_item* asItem ()
     {]b4_parse_assert_if([[
@@ -1015,10 +1018,12 @@ namespace ]b4_namespace_ref[
     // A magic number to check our pointer arithmetic is sane.
     enum { MAGIC = 713705 };
     unsigned int magic_;]])[
-  };
+  }; // class ]b4_parser_class[::glr_state
 } // namespace ]b4_namespace_ref[
 
 
+namespace
+{
   /** A stack of GLRState representing the different heads during
     * nondeterministic evaluation. */
   class glr_state_set
@@ -1154,7 +1159,8 @@ private:
 
     /** The last stack we invalidated.  */
     glr_state* yylastDeleted;
-};
+  }; // class glr_state_set
+} // namespace
 
 namespace
 {
@@ -1411,9 +1417,11 @@ namespace
     // A magic number to check our pointer arithmetic is sane.
     enum { MAGIC = 0xeff1cace };
     unsigned int magic_;]])[
-  };
-}
+  }; // class semantic_option
+} // namespace
 
+namespace
+{
   /** Type of the items in the GLR stack.
    *  It can be either a glr_state or a semantic_option. The is_state_ field
    *  indicates which item of the union is valid.  */
@@ -1539,7 +1547,8 @@ public:
     // A magic number to check our pointer arithmetic is sane.
     enum { MAGIC = 0xDEAD1ACC }; // 3735886540.
     const unsigned int magic_;]])[
-};
+  }; // class glr_stack_item
+} // namespace
 
 glr_state* glr_state::pred ()
 {]b4_parse_assert_if([[