begin = begin_

        if end_ty != TFRTypes.INDEX:
          end_ = self._ssa_name('end')
          self._emit_with_loc(
              '\n{} = arith.index_cast {} : {} to index'.format(
                  end_, end, end_ty), node)
          end = end_

        if step is None:
          step = self._ssa_name('step')

///
/// The API number increases whenever we break API compatibility while still
/// maintaining ABI compatibility. This happens only in the following cases:
///   1. A new method is added _at the end_ of the function table.
///   2. Preconditions or postconditions for one operation in these function
///   table change. Note that only core TensorFlow is able to impose these