fix(generator): even better error messages on unresolved types
fix(generator): even better error messages on unresolved types

BlackHC/di.dart,BlackHC/di.dart,winstonewert/di.dart,antingshen/di.dart,dart-archive/di.dart,antingshen/di.dart,Pacane/di.dart,winstonewert/di.dart,winstonewert/di.dart,winstonewert/di.dart,dart-archive/di.dart,dart-archive/di.dart,antingshen/di.dart,BlackHC/di.dart,antingshen/di.dart,dart-archive/di.dart,Pacane/di.dart,Pacane/di.dart,BlackHC/di.dart,Pacane/di.dart