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Closes https://github.com/flutter/flutter/issues/157928. Closes https://github.com/flutter/flutter/issues/157929. | Condition | Expectation | | --------- | ------------ | | `synthetic-packages: true` && `--implicit-pubpsec-resolution` | Generates `flutter_gen` with warning. | `<no synthetic-packages key>` && `--implicit-pubspec-resolution` | Generates `flutter_gen` with warning. | `synthetic-packages: false` && `--implicit-pubpsec-resolution` | Does not generate `flutter_gen`. | `synthetic-packages: true` && `--no-implicit-pubpsec-resolution` | Error. | `<no synthetic-packages key>` && `--no-implicit-pubspec-resolution` | Does not generate `flutter_gen`. | `synthetic-packages: false` && `--no-implicit-pubpsec-resolution` | Generates `flutter_gen` with warning.