Testcase:
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using System;
using System.Text;

public class Tests
{
	private delegate char EncodeChar(int val);

	private static StringBuilder EncodeWorker(string data, char empty, EncodeChar encFunc) {
		return null;
	}

    public static void Main() {
		EncodeWorker ("", ' ', delegate(int val) {
			switch (val) {
			default:
				throw new InvalidOperationException(String.Format("Bad int val: {0}", val));
			}
			});
	}
}
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duplicate

*** This bug has been marked as a duplicate of bug 336258 ***