Lorenzo Battistela enhanced the parsing layer of the HigherOrderCO/HVM3 repository by focusing on code quality and robustness. He refactored the parseTopImp function, replacing an if-then-else structure with a case expression to improve readability while maintaining existing behavior. Addressing parsing reliability, Lorenzo fixed the handling of global variables so that those prefixed with an apostrophe are recognized as globals even without explicit declarations, reducing unbound variable errors. Working primarily in Haskell and leveraging skills in functional programming and compiler development, he delivered clear, traceable commits that improved maintainability and set a solid foundation for future enhancements.