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580 /* The common part of an identifier node shared amongst all 3 C front
581 ends. Also used to store CPP identifiers, which are a superset of
582 identifiers in the grammatical sense. */
583
584 union _cpp_hashnode_value GTY(())
585 {
586 /* If a macro. */
587 cpp_macro * GTY((tag ("NTV_MACRO"))) macro;
588 /* Answers to an assertion. */
589 struct answer * GTY ((tag ("NTV_ANSWER"))) answers;
590 /* Code for a builtin macro. */
591 enum builtin_type GTY ((tag ("NTV_BUILTIN"))) builtin;
592 /* Macro argument index. */
593 unsigned short GTY ((tag ("NTV_ARGUMENT"))) arg_index;
594 };