Demo of Coroutine not working in flash because of foreach

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class FlashCRTest : MonoBehaviour {

    List<string> a = new List<string>(new string[] { "thing 1", "thing 2", "thing 3" });

    // Update is called once per frame
    void Update () {

        if (Input.GetKeyDown (KeyCode.Alpha1))
        {
            StartCoroutine(CR1());
        }

        if (Input.GetKeyDown (KeyCode.Alpha2))
        {
            StartCoroutine(CR2());
        }

    }


    IEnumerator CR1() {
        // Does not work in flash

        float startTime = Time.time;
        while (Time.time < startTime+1) {
            transform.Translate(Vector3.up * Time.deltaTime);
            yield return null;
        }


        foreach (string s in a)
        {
            Debug.Log (s);
            yield return null;
        }


    }


    IEnumerator CR2() {
        // Works in flash

        float startTime = Time.time;
        while (Time.time < startTime+1) {
            transform.Translate(Vector3.up * Time.deltaTime);
            yield return null;
        }

        for (int n=0; n<a.Count; ++n)
        {
            string s = a[n];
            Debug.Log (s);
            yield return null;
        }

    }




}