ICE on defined operator with parenthetical LHS argument

[Rouson, Damian]

Gfortran 4.6.0 20100925 halts with an ICE on the following module and main
program produce an ICE as shown below the code. It appears that having the
parenthesis around the left-hand-side argument "(u)" is required to produce
the ICE.  This is a greatly reduced example in which the parentheses are
superflous. In the actual code, I need the parentheses because they contain
a much longer expression.

$ cat field_main.f03
module field_module
  implicit none
  type ,abstract :: field
  contains
    procedure(field_op_real) ,deferred :: multiply_real
    generic :: operator(*) => multiply_real
  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
  end interface
end module

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

$ gfortran field_main.f03
f951: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

$ gfortran --version
GNU Fortran (GCC) 4.6.0 20100925 (experimental)
Copyright (C) 2010 Free Software Foundation, Inc.

GNU Fortran comes with NO WARRANTY, to the extent permitted by law.
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under the terms of the GNU General Public License.
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