[Bug fortran/53956] Proc-pointer w/ interface: Bogus "EXTERNAL attribute conflicts with FUNCTION attribute"

[janus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53956

--- Comment #1 from janus at gcc dot gnu.org 2012-07-13 18:57:44 UTC ---
Reduced test case:

  interface
    subroutine sub (c2)       
      integer, external :: c2 
    end subroutine
  end interface

  procedure(sub) :: fp

end