[Bug fortran/46328] [OOP] type-bound operator call with non-trivial polymorphic operand

["damian at rouson dot net" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46328

--- Comment #4 from Damian Rouson <damian at rouson dot net> 2011-10-31 02:06:36 UTC ---
Thanks for the update.  The same error occurs when a defined assignment is
added:


$ cat abstract_field_expression.F90 
module field_module
  implicit none
  type ,abstract :: field
  contains
    procedure(field_op_real) ,deferred :: multiply_real
    procedure(field_eq_field) ,deferred :: assign
    generic :: operator(*) => multiply_real
    generic :: assignment(=) => assign
  end type
  abstract interface
    function field_op_real(lhs,rhs)
      import :: field
      class(field) ,intent(in)  :: lhs
      real ,intent(in) :: rhs
      class(field) ,allocatable :: field_op_real
    end function
    subroutine field_eq_field(lhs,rhs)
      import :: field
      class(field) ,intent(inout)  :: lhs
      class(field) ,intent(in)  :: rhs
    end subroutine
  end interface
end module

program main
  use field_module
  implicit none
  class(field) ,pointer :: u
  u = (u)*2.
end program

$ gfortran abstract_field_expression.F90 
abstract_field_expression.F90:29.6:

  u = (u)*2.
      1
Error: Operands of binary numeric operator '*' at (1) are CLASS(field)/REAL(4)

$ gfortran --version
GNU Fortran (GCC) 4.6.2 20111019 (prerelease)