> Be aware that the way you utilize 'let' will be a breaking change. In ES5 and
> ES6
In addition to the fact that this feature is long since co-existing in FF and
doesn't seem to have broken the web, IIUC, there was already a "breaking
change" in ES6, with `let` and destructuring:
```js
let[x] = foo();
```
I believe it was deemed that the chances of that breakage being widespread were
low enough to warrant the `let` feature anyway. I would postulate (though I
don't have the facility to test it) that the exact function-call-and-block
pattern `let(x) { .. }` would be as much or less likely to occur in legacy code
than `let[x] = foo()`.
> If you consider use of block without context is ugly, use if(true) or
> do-while(false)
Those options are much uglier than the standalone `{ .. }` block.
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