Can we allow generator getter methods?
Here is an example use case:
```
let rectangle = {
start: {x: 1, y: 5},
width: 2,
height: 3,
*getCorners() {
let {x: startX, y: startY} = this.start;
yield this.start;
yield {x: startX + this.width, y: startY};
yield {x: startX + this.width, y: startY + this.height};
yield {x: startX, y: startY + this.height}
}
}
for (let corner of rectangle.getCorners()) {
console.log(corner);
}
```
I'm proposing to allow `get coreners* () { ...` (a generator getter
method) so the for..of loop can be written like this:
```
for (let corner of rectangle.corners) {
console.log(corner);
}
```
Which seems cleaner
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