fix: ReflectionException when used with debugbar.

[willvincent]

I'm not familiar enough to know if there would be any further implications here, though given that a string is expected I can't imagine so... This resolves #824 and all existing tests are still passing.

[taylorotwell]

Provide simple code for how to recreate this issue.

[willvincent]

Not sure what sort of code you're looking for, for this.. fresh install of laravel, with telescope + barryvdh/laravel-debugbar

I have narrowed it down to the events collector in debugbar. When that's enabled the exception is thrown on the default welcome view. With my fix applied it's not thrown, and telescope appears to continue functioning normally with my fix in place.

Debugbar is apparently populating variables with an unexpected value, so maybe the fault lies entirely there...?

[barryvdh]

I'm using a callable, not a Closure: https://github.com/barryvdh/laravel-debugbar/blob/master/src/DataCollector/EventCollector.php#L66

 $events->listen('*', [$this, 'onWildcardEvent']);

Perhaps we should add \Closure::fromCallable($variables['listener']);?

[willvincent]

That would probably make this a bit more accurate..