[Bug c++/19948] [4.0/4.1 Regression] ICE: tree check: expected class 'declaration', have 'exceptional' (error_mark) in pushtag, at cp/name-lookup.c:4658

[lerdsuwa at gcc dot gnu dot org]

------- Additional Comments From lerdsuwa at gcc dot gnu dot org  2005-02-28 06:22 -------
If you want a work around, simply use this in the first 'friend'
declaration:

  friend class util::persistent_object_manager;

There is still uncertainty about whether name from 'using' 
declaration/directive is allowed (DR138) so your workaround 
may not work in the future.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19948