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! { dg-do run }

! PR51870 - ALLOCATE with class function expression for SOURCE failed.

! This version of the test allocates class arrays with MOLD.

!

! Reported by Tobias Burnus  

!

module show_producer_class

  implicit none

  type integrand

    integer :: variable = 1

  end type integrand

  type show_producer

  contains

    procedure ,nopass :: create_show

    procedure ,nopass :: create_show_array

  end type

contains

  function create_show () result(new_integrand)

    class(integrand) ,allocatable :: new_integrand

    allocate(new_integrand)

    new_integrand%variable = -1

  end function

  function create_show_array (n) result(new_integrand)

    class(integrand) ,allocatable :: new_integrand(:)

    integer :: n, i

    allocate(new_integrand(n))

    select type (new_integrand)

      type is (integrand); new_integrand%variable = [(i, i= 1, n)]

    end select

  end function

end module

program main

  use show_producer_class

  implicit none

  class(integrand) ,allocatable :: kernel1(:), kernel2(:)

  type(show_producer) :: executive_producer

  allocate(kernel1(5), kernel2(5),mold=executive_producer%create_show_array (5))

  select type(kernel1)

    type is (integrand);  if (any (kernel1%variable .ne. 1)) call abort

  end select

  deallocate (kernel1)

  allocate(kernel1(3),mold=executive_producer%create_show ())

  select type(kernel1)

    type is (integrand); if (any (kernel1%variable .ne. 1)) call abort

  end select

  deallocate (kernel1)

  select type(kernel2)

    type is (integrand); kernel2%variable = [1,2,3,4,5]

  end select

  allocate(kernel1(3),source = kernel2(3:5))

  select type(kernel1)

    type is (integrand); if (any (kernel1%variable .ne. [3,4,5])) call abort

  end select

end program

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