Regression: ICE on "result" keyword

[Rouson, Damian]

The Gfortran 4.8.0 20120930 ICE shown below appears to stem from the
"result" keyword used in the first interface body.  The code works fine
with gfortran 4.7.2.  This is a simplified version of code from my book:

$ cat integrand.F90
module integrand_module

  type ,abstract :: integrand
  contains
    procedure(t_interface), deferred :: t
    procedure(assign_interface), deferred :: assign
    procedure(times_interface), deferred :: times
    generic :: operator(*) => times
    generic :: assignment(=) => assign
  end type

  abstract interface
    function t_interface(this) result(dState_dt)
      import :: integrand
      class(integrand) ,intent(in)  :: this
      class(integrand) ,allocatable :: dState_dt
    end function 
    function times_interface(lhs,rhs)
      import :: integrand
      class(integrand) ,intent(in)  :: lhs
      class(integrand) ,allocatable :: times_interface
      real, intent(in)  :: rhs
    end function 
    subroutine assign_interface(lhs,rhs)
      import :: integrand
      class(integrand) ,intent(in)    :: rhs
      class(integrand) ,intent(inout) :: lhs
    end subroutine 
  end interface

contains
  subroutine integrate(model,dt)
    class(integrand) :: model
    real dt
    model = model%t()*dt
   end subroutine 
end module 
$ gfortran -c integrand.F90
integrand.F90: In function 'integrate':
integrand.F90:35:0: internal compiler error: in gfc_conv_expr, at
fortran/trans-expr.c:5862
     model = model%t()*dt
 ^

integrand.F90:35:0: internal compiler error: Abort trap: 6
gfortran: internal compiler error: Abort trap: 6 (program f951)
Abort trap: 6
remote-ca41:gnu-regression rouson$ gfortran --version
GNU Fortran (MacPorts gcc48 4.8-20120930_1) 4.8.0 20120930 (experimental)
Copyright (C) 2012 Free Software Foundation, Inc.