During July 2025, Andrei Dreian worked on the oxcaml/oxcaml repository, focusing on compiler development with an emphasis on lexer and parser enhancements using ML. He implemented reserved syntax for runtime metaprogramming by updating the lexer and parser to recognize and restrict certain infix tokens, specifically reserving the symbols <[ and ]> for future features. This approach clarified language rules and improved error handling, ensuring that misuse of these tokens results in clear syntax errors. Andrei’s work established foundational parser guards and token reservations, aligning documentation and tests to support safer, more extensible metaprogramming capabilities in the language’s future evolution.