flutter_module_test frequent failures in build.dart #137418
Description
This appears to be a bug in the packages depended on by the tests ffi build.dart generated by https://github.com/flutter/flutter/blob/master/packages/flutter_tools/templates/package_ffi/build.dart.tmpl#L1
[2023-10-27 02:46:19.229580] [STDOUT] stdout: build.dart returned with exit code: 255.
[2023-10-27 02:46:19.229586] [STDOUT] stdout: To reproduce run:
[2023-10-27 02:46:19.229593] [STDOUT] stdout: /opt/s/w/ir/x/w/recipe_cleanup/tmp8mlkod7v/flutter sdk/bin/dart --packages=/opt/s/w/ir/x/t/flutter_module_test.NhBYM6/hello/.dart_tool/package_config.json /opt/s/w/ir/x/t/flutter_module_test.NhBYM6/ffi_package/build.dart --config=/opt/s/w/ir/x/t/flutter_module_test.NhBYM6/hello/.dart_tool/native_assets_builder/e5f052c3025f3a319f6dd3717bed6fa6/config.yaml
[2023-10-27 02:46:19.229599] [STDOUT] stdout: stderr:
[2023-10-27 02:46:19.229605] [STDOUT] stdout: Unhandled exception:
[2023-10-27 02:46:19.229611] [STDOUT] stdout: Unsupported operation: Cannot add to an unmodifiable list
[2023-10-27 02:46:19.229617] [STDOUT] stdout: #0 UnmodifiableListMixin.addAll (dart:_internal/list.dart:129:5)
[2023-10-27 02:46:19.229623] [STDOUT] stdout: #1 CBuilder.run (package:native_toolchain_c/src/cbuilder/cbuilder.dart:276:45)
[2023-10-27 02:46:19.229629] [STDOUT] stdout: <asynchronous suspension>
[2023-10-27 02:46:19.229635] [STDOUT] stdout: #2 main (file:///opt/s/w/ir/x/t/flutter_module_test.NhBYM6/ffi_package/build.dart:18:3)
[2023-10-27 02:46:19.229641] [STDOUT] stdout: <asynchronous suspension>