Parsing Expression Grammar Support for C# 3.0 Part 1 - PEG Lib and Parser Generator

using System;
delegate void D(int x);
class C
{
	public static void M1(int i) {
		Console.WriteLine("C.M1: " + i);
	}
	public static void M2(int i) {
		Console.WriteLine("C.M2: " + i);
	}
	public void M3(int i) {
		Console.WriteLine("C.M3: " + i);
	}
}
class Test
{
	static void Main() { 
		D cd1 = new D(C.M1);
		cd1(-1);				// call M1
		D cd2 = new D(C.M2);
		cd2(-2);				// call M2
		D cd3 = cd1 + cd2;
		cd3(10);				// call M1 then M2
		cd3 += cd1;
		cd3(20);				// call M1, M2, then M1
		C c = new C();
		D cd4 = new D(c.M3);
		cd3 += cd4;
		cd3(30);				// call M1, M2, M1, then M3
		cd3 -= cd1;			// remove last M1
		cd3(40);				// call M1, M2, then M3
		cd3 -= cd4;
		cd3(50);				// call M1 then M2
		cd3 -= cd2;
		cd3(60);				// call M1
		cd3 -= cd2;			// impossible removal is benign
		cd3(60);				// call M1
		cd3 -= cd1;			// invocation list is empty so cd3 is null
		//		cd3(70);		// System.NullReferenceException thrown
		cd3 -= cd1;			// impossible removal is benign
	}
}