Test.hx

class Test
{
	static function main ()
	{
		var t = Math.random();
		comment("This is a comment");
		trace(t);
	}

	static macro function comment (message:String)
	{
		#if display
		return macro null;
		#end

		var filename = "__tmp";
		var id = 0;

		while (sys.FileSystem.exists('$filename$id'))
		{
			++id;
		}

		var filename = '$filename$id';

		sys.io.File.saveContent(filename, "// " + message);
		return macro {
			haxe.macro.Compiler.includeFile($v{filename}, $v{haxe.macro.Compiler.IncludePosition.Inline});
			deleteFile($v{filename});
		};
	}

	static macro function deleteFile (file:String)
	{
		sys.FileSystem.deleteFile(file);
		return macro null;
	}
}