Extends expression performs differently on Edge

[Gareth Heyes]

On 26 May 2017 at 10:14, Alexander Jones <alex at weej.com> wrote:

> `y, z` is comma operator, no?
>

Then z{} should be a syntax error. Look Edge is insane:

```javascript
class y{}class z{}1,class x extends y,/a/,x=>{},class z extends alert(1),
class abc{}{}{}/alert(2)/+alert(3)
```
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