In December 2024, Jingcheng Cheng developed and integrated the initial EqSat PDLMatcher for the PDL interpreter within the xdsl repository. Focusing on interpreter development and pattern matching, Jingcheng implemented a new matcher class in Python to support EqSat e-class operations, enabling reliable type-based matching for the interpreter. The work included comprehensive unit tests to verify both matching types and fixed types, which improved the correctness and maintainability of the codebase. By establishing this foundation, Jingcheng’s contribution enhanced test coverage and set the stage for future feature delivery, addressing core requirements for robust pattern matching in the PDL interpreter.