Merge branch 'abstract-references'

doc/caveats.md

@@ -6,9 +6,11 @@ satisfy **all** 6to5 feature requirements by using the included
 
 | Feature                     | Requirements                                                                                                                        |
 | --------------------------- | ----------------------------------------------------------------------------------------------------------------------------------- |
+| Abstract References         | `Symbol`                                                                                                                            |
 | Array destructuring         | `Array.isArray`, `Array.from`                                                                                                       |
 | Async functions, Generators | [experimental option](usage.md#experimental), [regenerator runtime](https://github.com/facebook/regenerator/blob/master/runtime.js) |
 | Comprehensions              | [experimental option](usage.md#experimental), `Array.isArray`, `Array.from`                                                         |
+| For..Of                     | `Symbol`, `prototype[Symbol.iterator]`                                                                                              |
 | Spread                      | `Array.isArray`, `Array.from`                                                                                                       |
 
 ## Classes
@@ -36,14 +38,3 @@ class Bar extends Foo {
   }
 }
 ```
-
-## Constructor spread
-
-Constructor spreads do not currently support built-ins. ie.
-`new Array(...items)`.
-
-## For-of
-
-A polyfill is required for for-of functionality that implements `Symbol` and
-adds `prototype[Symbol.iterator]` behaviour to built-ins. Using the polyfills
-specified in [polyfill](polyfill.md) suffices.

doc/differences.md

@@ -69,6 +69,7 @@ better suited if you'd like a full ES6 environment with polyfills and all.
 
 |                              | 6to5  | Traceur | es6-transpiler | esnext | es6now | jstransform |
 | ---------------------------- | ----- | ------- | -------------- | ------ | ------ | ----------- |
+| Abstract references          | ✓     |         |                |        |        |             |
 | Array comprehension          | ✓     | ✓       | ✓              |        |        |             |
 | Arrow functions              | ✓     | ✓       | ✓              | ✓      | ✓      | ✓           |
 | Async functions              | ✓     | ✓       |                | ✓      |        |             |

doc/features.md

@@ -1,5 +1,13 @@
 # Features
 
+## Abstract references ([experimental](usage.md#experimental)) ([spec](https://github.com/zenparsing/es-abstract-refs))
+
+```javascript
+foo::bar;
+foo::bar = baz;
+delete foo::bar;
+```
+
 ## Array comprehension ([experimental](usage.md#experimental))
 
 ```javascript
@@ -31,7 +39,7 @@ var bob = {
 };
 ```
 
-## Async functions ([experimental](usage.md#experimental))
+## Async functions ([experimental](usage.md#experimental)) ([spec](https://github.com/lukehoban/ecmascript-asyncawait))
 
 ```javascript
 async function chainAnimationsAsync(elem, animations) {

doc/index.md

@@ -31,6 +31,7 @@ And it doesn't end here! To see all the ways you can use 6to5, check out the
 
 ## [Features](features.md)
 
+ - [Abstract references](features.md#abstract-references) ([experimental](usage.md#experimental))
  - [Array comprehension](features.md#array-comprehension) ([experimental](usage.md#experimental))
  - [Async functions](features.md#async-functions) ([experimental](usage.md#experimental))
  - [Arrow functions](features.md#arrow-functions)