Flow bindings have been deprecated for a while.
The reason behind this change is that `declare var foo`
doesn't introduce a new local binding, but it represents
a global one.
* Fix transform-arrow-functions in { spec: true } shadowing
The function name matching the variable declaration name could
shadow the actual function object inside the generated function,
leading to invalid behavior due to holding a reference to the
original unbound function.
* Combine it with transform-function-name just to be sure in spec: false
* Revert "Fix transform-arrow-functions in { spec: true } shadowing"
This reverts commit 1cafe2561d0b0ddd181b956a85eb074621da12e8.
* Much simpler version of the above fix
* Missing fixture updates
* Avoid using rest/spread to make the tests pass on node 4
* ...actually update _all_ the fixtures
* Fix path.popContext() to not try to load "-1" from contexts array.
The current implement of popContext does
```js
this.setContext(this.contexts[this.contexts.length - 1]);
```
even if `this.contexts` can be empty, which causes it to lookup the
property `"-1"`, which is not found on the array itself and obviously
also not in the `Object.prototype` and the `Array.prototype`. However
since `"-1"` is not a valid array index, but has a valid integer
representation, this is a very expensive lookup in V8 (and probably
other engines too, but that is probably less relevant, since Babel
most often runs on Node nowadays).
* Make zero check explicit (for readability).
This prevents a requeued path from inheriting a totally wrong scope later on. I can't find exactly where this is happening, but either way a path should only inherit scope from it's ancestors.
* Path#ensureBlock keeps path context
This ensures that if you're inside an ArrowFunction with an expression body (say, you're on the BooleanLiteral in `() => true`), you don't suddenly lose your path context after inserting a variable.
This is because of 82d8aded8e (diff-9e0668ad44535be897b934e7077ecea5R14). Basically, an innocent `Scope#push` caused my visitor to suddenly stop working. Now, we mutate the Path so it's still in the tree.
* Tests
