Helper class to infer type from lambdas in C#

InferHelper.cs

/// <summary>
    /// These classes are helper classes to help type inference for lambdas.
    /// <example>var f = () => 4; // will not compile,
    /// var f = Infer.Func(() => 4); // will compile.</example>
    /// <see cref="http://blogs.msdn.com/b/jaredpar/archive/2007/12/14/c-lambda-type-inference.aspx"/>
    /// 
    /// </summary>
    public static class Infer
    {
        public static Func<A> Func<A>(Func<A> f)
        {
            return f;
        }
        public static Func<A, B> Func<A, B>(Func<A, B> f)
        {
            return f;
        }
        public static Func<A, B, C> Func<A, B, C>(Func<A, B, C> f)
        {
            return f;
        }
        public static Func<A, B, C, D> Func<A, B, C, D>(Func<A, B, C, D> f)
        {
            return f;
        }
        public static Func<A, B, C, D, E> Func<A, B, C, D, E>(Func<A, B, C, D, E> f)
        {
            return f;
        }
        public static Action<A> Action<A>(Action<A> f)
        {
            return f;
        }
        public static Action<A, B> Action<A, B>(Action<A, B> f)
        {
            return f;
        }
        public static Action<A, B, C> Action<A, B, C>(Action<A, B, C> f)
        {
            return f;
        }
        public static Action<A, B, C, D> Action<A, B, C, D>(Action<A, B, C, D> f)
        {
            return f;
        }
    }