DartDoc 5.1.0 crashing on Flutter Docs #3039
Description
I tried to bump Flutter's use of dartdoc to 5.1.0 in flutter/flutter#104010, but its reliably crashing on CI: https://cirrus-ci.com/task/6006578632458240
dartdoc:stdout: Generating docs for library webdriver.sync_core from package:webdriver/sync_core.dart...
dartdoc:stderr:
dartdoc:stderr: dartdoc 5.1.0 (/root/.pub-cache/global_packages/dartdoc/bin/dartdoc.dart-2.18.0-124.0.dev.snapshot) failed: FileSystemException(path=/root/.pub-cache/hosted/pub.dartlang.org/dartdoc-5.1.0/lib/resources/docs.dart.js; message=Cannot open file)
dartdoc:stderr: #0 _PhysicalFile.readAsBytesSync (package:analyzer/file_system/physical_file_system.dart:148:7)
dartdoc:stderr: #1 HtmlGeneratorBackend._copyResources (package:dartdoc/src/generator/html_generator.dart:70:46)
dartdoc:stderr: <asynchronous suspension>
dartdoc:stderr: #2 HtmlGeneratorBackend.generateAdditionalFiles (package:dartdoc/src/generator/html_generator.dart:49:5)
dartdoc:stderr: <asynchronous suspension>
dartdoc:stderr: #3 GeneratorFrontEnd.generate (package:dartdoc/src/generator/generator_frontend.dart:25:5)
dartdoc:stderr: <asynchronous suspension>
dartdoc:stderr: #4 Dartdoc.generateDocsBase (package:dartdoc/src/dartdoc.dart:181:5)
dartdoc:stderr: <asynchronous suspension>
dartdoc:stderr: #5 Dartdoc.generateDocs (package:dartdoc/src/dartdoc.dart:223:24)
dartdoc:stderr: <asynchronous suspension>
dartdoc:stderr: #6 Dartdoc.executeGuarded.<anonymous closure> (package:dartdoc/src/dartdoc.dart:261:9)
dartdoc:stderr: <asynchronous suspension>