Crash when the source exports package:flutter/material.dart #4083
Description
I have a private design system library which re-exports package:flutter/material.dart, while hiding some classes and providing alternatives for them. When trying run dart doc in my library, it crashes with dartdoc 8.2.0 (...) failed: UnimplementedError: No members on Library.sentinel are accessible. I can't share my library here, but I created a reproducible example in https://github.com/pedroleiterocha/dart_doc_test.