如何在Unity的协程中引用本地变量？

IEnumerator MyCoroutine()
{
    int localVar = 10;
    Action<int> action = (value) =>
    {
        Debug.Log("Local variable: " + value);
    };

    yield return null;

    action(localVar);
}

IEnumerator MyCoroutine(int localVar)
{
    yield return null;

    Debug.Log("Local variable: " + localVar);
}

void Start()
{
    int localVar = 10;
    StartCoroutine(MyCoroutine(localVar));
}

public class MyScript : MonoBehaviour
{
    private int localVar = 10;

    IEnumerator MyCoroutine()
    {
        yield return null;

        Debug.Log("Local variable: " + localVar);
    }

    void Start()
    {
        StartCoroutine(MyCoroutine());
    }
}