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! { dg-do run }

! Test assignments of nested derived types with allocatable components(PR 20541).

!

! Contributed by Erik Edelmann  

!            and Paul Thomas  

!

  type :: a

    integer, allocatable :: i(:)

  end type a

  type :: b

    type (a), allocatable :: at(:)

  end type b

  type(a) :: x(2)

  type(b) :: y(2), z(2)

  integer i, m(4)

  x(1) = a((/1,2,3,4/))

  x(2) = a((/1,2,3,4/)+10)

  y(1) = b((/x(1),x(2)/))

  y(2) = b((/x(2),x(1)/))

  y(2) = y(1)

  forall (j=1:2,k=1:4, y(1)%at(j)%i(k) .ne. y(2)%at(j)%i(k)) &

                             y(1)%at(j)%i(k) = 999

  if (any ((/((y(1)%at(j)%i(k), k=1,4),j=1,2)/) .eq. 999)) call abort ()

  z = y

  forall (i=1:2,j=1:2,k=1:4, z(i)%at(j)%i(k) .ne. y(i)%at(j)%i(k)) &

                             z(i)%at(j)%i(k) = 999

  if (any ((/(((z(i)%at(j)%i(k), k=1,4),j=1,2),i=1,2)/) .eq. 999)) call abort ()

end