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This is on a DG-Aviion, DGUX 5.4.1.  The errors all occur on lines 
where the elements of the enum element_state are mentioned.

This file compiled in the previous version of g++ 2.2.2 on the DG and the Sun4
SunOS 4.1.1.

hobbes[73]% 	g++ -v -g -D_M88KBCS_TARGET -I. -W -Wreturn-type -Wcomment -c g++bug.cxx
Reading specs from /usr/local/lib/gcc-lib/m88k-dgux/2.2.2/specs
gcc version 2.2.2
 /usr/local/lib/gcc-lib/m88k-dgux/2.2.2/cpp -lang-c++ -v -D_M88KBCS_TARGET -I. -undef -D__GNUC__=2 -D__GNUG__=2 -D__cplusplus -Dm88000 -Dm88k -Dunix -DDGUX -D__CLASSIFY_TYPE__=2 -D__svr4__ -D__m88000__ -D__m88k__ -D__unix__ -D__DGUX__ -D__CLASSIFY_TYPE__=2 -D__svr4__ -D__m88000 -D__m88k -D__unix -D__DGUX -D__CLASSIFY_TYPE__=2 -D__svr4__ -Asystem(unix) -Acpu(m88k) -Amachine(m88k) -g -W -Wreturn-type -Wcomment -D__OPEN_NAMESPACE__ g++bug.cxx /usr/tmp/cca15804.i
GNU CPP version 2.2.2 (88open OCS/BCS, 21 Jul 1992)
 /usr/local/lib/gcc-lib/m88k-dgux/2.2.2/cc1plus /usr/tmp/cca15804.i -quiet -dumpbase g++bug.cc -g -W -Wreturn-type -Wcomment -version -o /usr/tmp/cca15804.s
GNU C++ version 2.2.2 (88open OCS/BCS, 21 Jul 1992) compiled by GNU C version 2.2.2.
g++bug.cxx: In method `void  notification_element::init (void *)':
g++bug.cxx:26: parse error before `;'
g++bug.cxx: In method `int  notification_element::mark_deleted ()':
g++bug.cxx:31: parse error before `)'
g++bug.cxx:32: parse error before `;'
g++bug.cxx: In method `int  notification_element::mark_suspended ()':
g++bug.cxx:35: parse error before `)'
g++bug.cxx:36: parse error before `)'
g++bug.cxx: In method `int  notification_element::protect ()':
g++bug.cxx:39: parse error before `)'
g++bug.cxx:40: parse error before `;'
g++bug.cxx: In method `void  notification_element::unprotect ()':
g++bug.cxx:42: parse error before `;'


---------------------------- g++bug.cxx -----------------------------
#define USING_NOTIFY 1
typedef class notification_table *art_notification_table;

#define NULL 0
#define FALSE 0
#define TRUE 1

typedef int boolean;
typedef void *art_object;
typedef void *art_iterator;
typedef void *art_symbol;
extern art_object a_nil;

class art_base {
 protected:
};
 
enum element_state { CLEAN, PROTECTED, DELETE, SUSPEND};

class notification_element:public art_base {
 protected:
  art_object key;
  notification_element *next;
  enum element_state state;
  void init(art_object object)
    { key = object; next = NULL; state = CLEAN; }
  virtual ~notification_element() {}
  virtual void call(art_object object) {}
  virtual boolean match(void *, void *, void *) { return(FALSE); }
  boolean mark_deleted()
    { if (state == CLEAN) return(FALSE);
      state = DELETE;
      return(TRUE); }
  boolean mark_suspended()
    { if (state == CLEAN) return(FALSE);
      if (state == PROTECTED) state = SUSPEND;
      return(TRUE); }
  boolean protect()
    { if (state != CLEAN) return(FALSE);
      state = PROTECTED;
      return(TRUE); }
  void unprotect() { state = CLEAN; }
  friend art_object a_next_notification(art_iterator state, art_symbol type, void *base,
			       void (*fun)(void *, art_object, void *),
			       void *arg);
  friend void a_restore_notifications(art_symbol type, void *target);
  friend void a_suspend_notifications(art_symbol type, void *target);
 public:
  friend class notification_table;
};