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program gfcbug43 call try_fit (1) call try_fit (1) contains subroutine try_fit (k) call fit (1, debug=.true.) end subroutine try_fit subroutine fit (k, debug) logical, intent(in), optional :: debug do j = 1, 2 maxerr1 = funk (r ,x1 , x1) end do if (debug) then print *, "help" end if end subroutine fit end program gfcbug43