Dart analysis issues warnings "Missing type annotation." for intl generated code

[markohrastovec]

Describe the bug
Generated code messages_xx.dart produces dart analysis warnings with "Missing type annotation." It is annoying because git commit & push in Android Studio always asks for an additional confirmation to commit the source with warnings.

To Reproduce
Here is the example of generate code, where months and count do not have type:

static String m0(months, count) =>
"${months} ${Intl.plural(count, zero: 'months', one: 'month', two: 'months', few: 'months', many: 'months', other: 'months')}";

In the arb file it looks like this:
"monthsLabel": "{months} {count, plural, =0{months} =1{month} =2{months} few{months} many{months} other{months}}",
"@monthsLabel": {
"placeholders": {
"months": {}
}
},

System info
$ dart pub deps --style compact
Dart SDK 3.8.1
Flutter SDK 3.32.7
xxx 1.0.0+9

dependencies:

• cloud_firestore 6.0.0 [cloud_firestore_platform_interface cloud_firestore_web collection firebase_core firebase_core_platform_interface flutter meta]
• cupertino_icons 1.0.8
• dynamic_tabbar 1.0.9 [flutter]
• firebase_app_check 0.4.0 [firebase_app_check_platform_interface firebase_app_check_web firebase_core firebase_core_platform_interface flutter]
• firebase_core 4.0.0 [firebase_core_platform_interface firebase_core_web flutter meta]
• flutter 0.0.0 [characters collection material_color_utilities meta vector_math sky_engine]
• flutter_localizations 0.0.0 [flutter intl characters clock collection material_color_utilities meta path vector_math]
• flutter_multi_slider 2.0.1 [flutter]
• intl 0.20.2 [clock meta path]
• mask_text_input_formatter 2.9.0 [flutter]
• number_text_input_formatter 1.0.0+8 [flutter]
• package_info_plus 8.3.0 [ffi flutter flutter_web_plugins http meta path package_info_plus_platform_interface web win32 clock]
• provider 6.1.5 [collection flutter nested]
• shared_preferences 2.5.3 [flutter shared_preferences_android shared_preferences_foundation shared_preferences_linux shared_preferences_platform_interface shared_preferences_web shared_preferences_windows]

dev dependencies:

• flutter_lints 6.0.0 [lints]
• flutter_test 0.0.0 [flutter test_api matcher path fake_async clock stack_trace vector_math leak_tracker_flutter_testing async boolean_selector characters collection leak_tracker leak_tracker_testing material_color_utilities meta source_span stream_channel string_scanner term_glyph vm_service]

transitive dependencies:

• _flutterfire_internals 1.3.60 [collection firebase_core firebase_core_platform_interface flutter meta]
• async 2.13.0 [collection meta]
• boolean_selector 2.1.2 [source_span string_scanner]
• characters 1.4.0
• clock 1.1.2
• cloud_firestore_platform_interface 7.0.0 [_flutterfire_internals collection firebase_core flutter meta plugin_platform_interface]
• cloud_firestore_web 5.0.0 [_flutterfire_internals cloud_firestore_platform_interface collection firebase_core firebase_core_web flutter flutter_web_plugins]
• collection 1.19.1
• fake_async 1.3.3 [clock collection]
• ffi 2.1.4
• file 7.0.1 [meta path]
• firebase_app_check_platform_interface 0.2.0 [_flutterfire_internals firebase_core flutter meta plugin_platform_interface]
• firebase_app_check_web 0.2.0+15 [_flutterfire_internals firebase_app_check_platform_interface firebase_core firebase_core_web flutter flutter_web_plugins web]
• firebase_core_platform_interface 6.0.0 [collection flutter flutter_test meta plugin_platform_interface]
• firebase_core_web 3.0.0 [firebase_core_platform_interface flutter flutter_web_plugins meta web]
• flutter_web_plugins 0.0.0 [flutter characters collection material_color_utilities meta vector_math]
• http 1.4.0 [async http_parser meta web]
• http_parser 4.1.2 [collection source_span string_scanner typed_data]
• leak_tracker 10.0.9 [clock collection meta path vm_service]
• leak_tracker_flutter_testing 3.0.9 [flutter leak_tracker leak_tracker_testing matcher meta]
• leak_tracker_testing 3.0.1 [leak_tracker matcher meta]
• lints 6.0.0
• matcher 0.12.17 [async meta stack_trace term_glyph test_api]
• material_color_utilities 0.11.1 [collection]
• meta 1.16.0
• nested 1.0.0 [flutter]
• package_info_plus_platform_interface 3.2.0 [flutter meta plugin_platform_interface]
• path 1.9.1
• path_provider_linux 2.2.1 [ffi flutter path path_provider_platform_interface xdg_directories]
• path_provider_platform_interface 2.1.2 [flutter platform plugin_platform_interface]
• path_provider_windows 2.3.0 [ffi flutter path path_provider_platform_interface]
• platform 3.1.6
• plugin_platform_interface 2.1.8 [meta]
• shared_preferences_android 2.4.10 [flutter shared_preferences_platform_interface]
• shared_preferences_foundation 2.5.4 [flutter shared_preferences_platform_interface]
• shared_preferences_linux 2.4.1 [file flutter path path_provider_linux path_provider_platform_interface shared_preferences_platform_interface]
• shared_preferences_platform_interface 2.4.1 [flutter plugin_platform_interface]
• shared_preferences_web 2.4.3 [flutter flutter_web_plugins shared_preferences_platform_interface web]
• shared_preferences_windows 2.4.1 [file flutter path path_provider_platform_interface path_provider_windows shared_preferences_platform_interface]
• sky_engine 0.0.0
• source_span 1.10.1 [collection path term_glyph]
• stack_trace 1.12.1 [path]
• stream_channel 2.1.4 [async]
• string_scanner 1.4.1 [source_span]
• term_glyph 1.2.2
• test_api 0.7.4 [async boolean_selector collection meta source_span stack_trace stream_channel string_scanner term_glyph]
• typed_data 1.4.0 [collection]
• vector_math 2.1.4
• vm_service 15.0.0
• web 1.1.1
• win32 5.14.0 [ffi]
• xdg_directories 1.1.0 [meta path]