Analysis errors now have a [message, correction, and documentation URL](https://htmlpreview.github.io/?https://github.com/dart-lang/sdk/blob/master/pkg/analysis_server/doc/api.html#type_AnalysisError). We should show these details if they are available.  DartPad only displays the message: <img width="391" alt="Screen Shot 2020-11-16 at 10 18 27 AM" src="https://user-images.githubusercontent.com/1145719/99291739-1fdd4e00-27f5-11eb-839a-79b3bdfcfbbd.png">
Analysis errors now have a message, correction, and documentation URL. We should show these details if they are available.
DartPad only displays the message: