Add a failing test for handling `arguments` correctly.

[eventualbuddha]

Per the relevant section of the ES6 spec, arguments inside an arrow function refers to the arguments in the lexically enclosing function.

I tried to fix this using a case infix macro, but I don't understand it well enough to know exactly how to start.

[jlongster]

Nice, I did not know that about arrow functions. I will think about the best way to do this. I think we'll need a few helper macros, and only one of them needs to be a small case macro: the one that detects if arguments exists. Will follow up on this.

[jlongster]

This has been fixed in 74695b85285830b6175fdf69c2d3f0844280fecc

https://github.com/jlongster/es6-macros/blob/master/macros/fat-arrow.sjs

[eventualbuddha]

Thanks, @jlongster! I'm glad you found a solution. Unfortunately, I'm going to make it harder. Given this code:

var a = () => function(){ return arguments; }

You get this:

var a = function (__fa_args) {
        return function () {
            return __fa_args;
        };
    }.bind(this, arguments);

Which is incorrect. The arguments reference inside the inner function should not be re-written. Also, matching arguments as an identifier is a little too aggressive:

var a = () => b.arguments;

Becomes:

var a = function (__fa_args) {
        return b.__fa_args;
    }.bind(this, arguments);

[jlongster]

My quick 2AM hacking was obviously not thought through. There's actually a pretty elegant solution that involves much better parsing. I'll fix soon.

[jlongster]

Fixed on master.