I wrote some code like the following in tracuer
```
class Foo {
constructor() {
spawn(function*() {
let data = yield this.fetchData(); // error because 'this' is
undefined
});
}
fetchData() {
// returns promise
}
}
```
I used the spawn function from here:
https://gist.github.com/jakearchibald/31b89cba627924972ad6
The code doesn't work because 'this' is undefined. I can fix it by using
'let that = this' pattern. But it feels like a step backward now that I've
fallen in love with lambda functions. So I was wondering if it would be
possible to use lexical binding for 'this' inside anonymous generators.
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