docs: def p_foreach_variable(p):
      '''foreach_variable : VARIABLE
                          | AND VARIABLE'''
      if len(p) == 2:
          p[0] = ast.ForeachVariable(p[1], False, lineno=p.lineno(1))
      else:
          p[0] = ast.ForeachVariable(p[2], True, lineno=p.lineno(1))