mfc extend not supported?

[rupertford]

I think this internal compiler error is to do with the extend clause

module field_mod

  implicit none

  type, public, extends(field_type) :: r2d_field
     integer :: ntiles
  end type r2d_field
  
end module field_mod

fortran03-buildscope.c:3432(gather_attr_spec_item): Internal compiler error.
fortran03-buildscope.c:3432(gather_attr_spec_item): Please report a bug at [email protected] with preprocessed source if possible
fortran03-buildscope.c:3432(gather_attr_spec_item): Unhandled handler of '(' (AST_ATTR_SPEC)