https://ci.chromium.org/ui/p/dart/builders/try/flutter-analyze-try started breaking as of Nov 30 at 12:13pm (Pacific standard time). I believe the breakage was caused by flutter/packages@0e20a04 removing // ignore comments from the go_router_builder package.

Previous discussion:

• [go_router_builder] Ignore experimental features packages#10275, which added the // ignore comments
• Fixing deps for build_runner in flutter/packages broke Dart infra #177393, which discussed possible ways of preventing a repeat of this issue

A green result from the flutter-analyze-try bot is a prerequisite for landing changes to the dart analyzer (and related packages), so this problem is blocking a nontrivial subset of dart development work.