type t
  integer :: i
  class(t), allocatable :: foo
end type t

In Fortran 2003 this is invalid to have CLASS(T) in the same TYPE as the one
being defined. I think Fortran 2008 allows this, but as currently, deallocating
also does not work, I would simply reject it.


C438 (R440) If the POINTER attribute is not specified for a component, the
declaration-type-spec in the component-def-stmt shall be CLASS(*) or shall
specify an intrinsic type or a previously defined derived type.

C439 (R440) If the POINTER attribute is specified for a component, the
declaration-type-spec in the component-def-stmt shall be CLASS(*) or shall
specify an intrinsic type or any accessible derived type including the type
being defined.


-- 
           Summary: [OOP] Reject CLASS(T) as component of "TYPE :: T"
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: burnus at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41585

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