arrow function syntax simplified

[Kevin Smith]

>
> No, the strawman says => *always* lexically binds |this|. How was it
> unclear? I will fix it.
>

Yes - I understood that.  My point (and *I* was probably being unclear -
it's late here on the east coast) was that if you want lexically bound this
for multistatement closures, you can choose

    (x) => do { ;;; }

    // or

    (this = this, x) -> { ;;; }

Both of which are a little heavy.  Not bad, though.  On the other hand,
this might strike just the right balance:

    (x) -> {
      this; // lexically bound - yay!
    }

In other words, all arrow functions would have lexically bound this, and
the fatness of the arrow would distinguish between blocks and expressions.
 This is a departure from CoffeeScript, I realize.

kevin
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