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! { dg-do run }

! PR fortran/31188

program foo_mod

  implicit none

  character (len=1), parameter :: letters(2) = (/"a","b"/)

  call concat(1, [1])

  call concat(2, [2])

  call concat(3, [1,2])

  call concat(4, [2,1])

  call concat(5, [2,2,2])

contains

  subroutine concat(i, ivec)

    integer, intent(in)  :: i, ivec(:)

    write (*,*) i, "a" // letters(ivec)

  end subroutine concat

end program foo_mod

! { dg-output " *1 aa(\n|\r\n|\r)" }

! { dg-output " *2 ab(\n|\r\n|\r)" }

! { dg-output " *3 aaab(\n|\r\n|\r)" }

! { dg-output " *4 abaa(\n|\r\n|\r)" }

! { dg-output " *5 ababab(\n|\r\n|\r)" }