Worked on the ruby/ruby repository to improve error reporting for undefined methods encountered during aliasing operations. Addressed a specific bug in the rb_alias function by modifying the error handling flow in C, ensuring that rb_print_undef receives the target class for more precise diagnostics. Added a regression test in Ruby to validate the new messaging, particularly for zsuper scenarios where aliasing an undefined method previously produced unclear errors. This update reduced debugging time and enhanced the developer experience by providing clearer, context-aware error messages. The work demonstrated proficiency in C programming, Ruby internals, and rigorous testing practices within core language development.