text: from ...Helpers.environment import Environment
  
  
  def strset(env, node):
      args_node = node.args.interpret(env)
      if len(args_node) < 3:
          raise RuntimeError('strset is not call with three arguments')
      str = args_node[0].interpret(env)
      var_name = args_node[0].name
      char_index = args_node[1].interpret(env)
      if char_index < 0 or char_index >= len(str):
          raise RuntimeError('strset: incorrect index')
      new_char = args_node[2].interpret(env)
      new_str = list(str)
      new_str[char_index] = chr(new_char)
      Environment(env).set(var_name, "".join(new_str))
  