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From: "mikael at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/47546] Internal error - free_pi_tree(): Unresolved fixup
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47546

--- Comment #14 from Mikael Morin <mikael at gcc dot gnu.org> 2011-02-02 22:24:54 UTC ---
in read_module, around line 4390

      /* Skip symtree nodes not in an ONLY clause, unless there
         is an existing symtree loaded from another USE statement.  */
      if (p == NULL)
        {
          st = gfc_find_symtree (gfc_current_ns->sym_root, name);
          if (st != NULL)
        info->u.rsym.symtree = st;
          continue;
        }


state_t from hydro_speeds(imported from hydro_state) is not loaded because
state_t from hydro_state is already present in the namespace. Thus the
components of state_t from hydro_speeds are not loaded either. 

I don't see any obvious/easy fix right now.

I think there were some module symbol conflicts PRs more or less related to
this, but can't find them.