Error reporting: could an error in `E.on('xyz', ...)` report that in the stack

As the title...

```
E.on("xyz", function() {
  throw new Error("Oh no");
});
```

reports:

```
Uncaught Error: Oh no
    at :1:24
throw new Error("Oh no");
```

could it report:

```
Uncaught Error: Oh no
    at :1:24
throw new Error("Oh no");
    called from E.on("xyz") handler
```