When ActionView::Template::Error is shown, live shell is missing on last frame

[RobinDaugherty]

The synthesized frame doesn't have a binding, so there's no live shell for it. There is a binding that could be used for this frame, but it's in the cause's top stack frame, not deeper in the most recent (topmost) error's stack frame.

One solution is to show the cause of the ActionView::Template::Error instead of synthesizing a backtrace frame. That would be a quick fix, but has the disadvantage that there might be useful debug information in the topmost error.

#464 would solve this while allowing the developer to navigate between the causes instead of only showing a specific one. A nice-to-have in that case would be for Better Errors to show the second cause in the chain by default, while still allowing navigation back to the ActionView::Template::Error.

[aximuseng]

Same issue here - I have a partial rendered and can't inspect anything on that page to find the nil error I am getting.

[skatkov]

We rolled back to 2.5.1 version and this bug disappeared.