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From: "pault at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/98498] Interp request: defined operators and unlimited
 polymorphic
Date: Sun, 03 Jan 2021 12:22:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98498

Paul Thomas <pault at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |pault at gcc dot gn=
u.org

--- Comment #1 from Paul Thomas <pault at gcc dot gnu.org> ---
Created attachment 49869
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D49869&action=3Dedit
Fix pending the iterpretation request

! { dg-do compile }
! { dg-options "-fdump-tree-original" }
!
! gfortran.dg/interface_49.f90
! Tests the fix for PR98498 in which the '=3D=3D' operator interface was not
! applied to intrinsic type/kind expressions. This meant that the
! interface was not applied to the .eq. expressions in 'star_eq' even
! though the unlimited polymorphic dummies are type compatible with all
! entities. The tree dump used to contain 10 'star_eq's.
!
! Note that overridding intrinsic operators with functions that have
! compliant intrinsic dummies still yields the error "Operator interface
! at (1) conflicts with intrinsic interface", as required by
! F2003(12.3.2.1.1).
!
! Contributed by Paul Thomas  <pault@gcc.gnu.org>
!
MODULE mytypes
  IMPLICIT none

  TYPE pvar
     character(len=3D20) :: name
     integer           :: level
  end TYPE pvar

  interface operator (=3D=3D)
     module procedure star_eq
  end interface

contains
  RECURSIVE function star_eq(a,b) ! The recursive attribute should not be
required.
    implicit none
    class(*), intent(in) ::a,b
    logical ::star_eq
    if (.not. same_type_as (a, b)) then
      star_eq =3D .false.
      return
    end if
    select type (a)
      type is (pvar)
      select type (b)
        type is (pvar)
          print *, "a & b are type pvar"
          if((a%level.eq. b%level) .and. (a%name .eq. b%name)) then
            star_eq =3D .true.
          else
            star_eq =3D .false.
          end if
      end select
      class default
        print *, "class default: returning false"
        star_eq =3D .false.
    end select
  end function star_eq

end MODULE mytypes

program test_eq
   use mytypes
   implicit none

   type(pvar) x, y
   x =3D pvar('test 1', 100)
   y =3D pvar('test 1', 100)
   write(*, *) x =3D=3D y
   x =3D pvar('test 1', 100)
   y =3D pvar('test 2', 100)
   write(*, *) x =3D=3D y
end program test_eq
! { dg-final { scan-tree-dump-times "star_eq" 12 "original" } }=