It's a grammar hack, but IMO an intuitive one: if you have whitespace around the ::, it's a contract annotation; otherwise it's the prototype operator. To quot

It's a grammar hack, but IMO an intuitive one: if you have whitespace around the ::, it's a contract annotation; otherwise it's the prototype operator. To quote Jeremy Ashkenas's JSConf talk on forking CoffeeScript: "when in doubt, cheat." ;-P