If I could add one feature to a programming language I currently use, it would be a built-in automatic dependency resolution and management system, similar to what some modern frameworks have but integrated at the language level. This feature would automatically detect and handle updates or changes in dependencies, ensuring that the correct versions of libraries are always in use, without needing manual intervention or the management of configuration files like package.json or requirements.txt. This feature would enhance productivity by significantly reducing the time spent on dependency conflicts and the often tedious process of managing multiple versions of libraries across different environments. It would also improve the language's capabilities by making it easier to maintain large, complex projects without worrying about breaking changes or compatibility issues between dependencies. Having this feature integrated at the language level would help developers focus more on writing code and solving problems, rather than managing the ecosystem surrounding it.