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! Program to test the UNPACK intrinsic

program intrinsic_unpack

   integer, dimension(3, 3) :: a, b

   logical, dimension(3, 3) :: mask;

   character(len=50) line1, line2

   integer i

   mask = reshape ((/.false.,.true.,.false.,.true.,.false.,.false.,&

                    &.false.,.false.,.true./), (/3, 3/));

   a = reshape ((/1, 0, 0, 0, 1, 0, 0, 0, 1/), (/3, 3/));

   b = unpack ((/2, 3, 4/), mask, a)

   if (any (b .ne. reshape ((/1, 2, 0, 3, 1, 0, 0, 0, 4/), (/3, 3/)))) &

      call abort

   write (line1,'(10I4)') b

   write (line2,'(10I4)') unpack((/2, 3, 4/), mask, a)

   if (line1 .ne. line2) call abort

   b = -1

   b = unpack ((/2, 3, 4/), mask, 0)

   if (any (b .ne. reshape ((/0, 2, 0, 3, 0, 0, 0, 0, 4/), (/3, 3/)))) &

      call abort

end program