raise NotImplementedError('arguments not supported.')

  def visit_Lambda(self, node):
    raise NotImplementedError('Lambda not supported.')

  def _get_mlir_ssa_values(self, name_prefix, out_types):
    """Create MLIR convention SSA values."""
    out_ssa_values = []
    if not out_types:
      return '', out_ssa_values

    out_name = self._ssa_name(name_prefix)