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From: "damian at rouson dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/55297] New: 4.8 Regression: type-bound operator clashes with abstract interface
Date: Mon, 12 Nov 2012 23:17:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55297

             Bug #: 55297
           Summary: 4.8 Regression: type-bound operator clashes with
                    abstract interface
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: damian@rouson.net


$ cat athlete.f90
module athlete_module
  type athlete
  contains
    procedure :: negative
    generic :: operator(-) => negative
  end type
  abstract interface 
    integer function sum_interface(this)
      import athlete
      class(athlete) this
    end function
  end interface
contains
  integer function negative(this)
    class(athlete) ,intent(in) :: this
  end function
end module
$ gfortran-mp-4.7 -c athlete.f90
$ gfortran-mp-4.8 -c athlete.f90
athlete.f90:5.29:

    generic :: operator(-) => negative
                             1
Error: Entity 'negative' at (1) is already present in the interface
wlan-clients-2916:gnu rouson$ gfortran-mp-4.8 --version
GNU Fortran (MacPorts gcc48 4.8-20121021_0) 4.8.0 20121021 (experimental)