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! { dg-do compile }

!

! PR 41556: [OOP] Errors in applying operator/assignment to an abstract type

!

! Contributed by Damian Rouson 

module abstract_algebra

  implicit none

  private

  public :: rescale

  public :: object

  type ,abstract :: object

  contains

    procedure(assign_interface) ,deferred :: assign

    procedure(product_interface) ,deferred :: product

    generic  :: assignment(=) => assign

    generic  :: operator(*) => product

  end type

  abstract interface

    function product_interface(lhs,rhs) result(product)

      import :: object

      class(object) ,intent(in)  :: lhs

      class(object) ,allocatable :: product

      real          ,intent(in)  :: rhs

    end function

    subroutine assign_interface(lhs,rhs)

      import :: object

      class(object) ,intent(inout) :: lhs

      class(object) ,intent(in)    :: rhs

    end subroutine

  end interface

contains

  subroutine rescale(operand,scale)

    class(object)    :: operand

    real ,intent(in) :: scale

    operand = operand*scale

    operand = operand%product(scale)

  end subroutine

end module

! { dg-final { cleanup-modules "abstract_algebra" } }