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using System;
public class Test : IEnumerable
{
	public int a { get; set; }
	public string b { get; set; }
	public double c { get; set; }
	IEnumerator IEnumerable.GetEnumerator()
	{
	            yield return a;
	            yield return b;
	            yield return c;
	}
}

prog.cs(2,21): error CS0246: The type or namespace name `IEnumerable' could not be found. Are you missing `System.Collections' using directive?
prog.cs(7,14): error CS0246: The type or namespace name `IEnumerable' could not be found. Are you missing `System.Collections' using directive?
Compilation failed: 2 error(s), 0 warnings

Standard output is empty