venv/lib/python3.12/site-packages/numpy/f2py/tests/src/callback/gh25211.f

      SUBROUTINE FOO(FUN,R)
      EXTERNAL FUN
      INTEGER I
      REAL*8 R, FUN
Cf2py intent(out) r
      R = 0D0
      DO I=-5,5
         R = R + FUN(I)
      ENDDO
      END