Developed a dedicated compiler plugin for the macvim-dev/macvim repository, focusing on enhancing error handling and reporting for Vim users running tasks with the Just command runner. The work involved writing Vim script to configure makeprg and implement a custom errorformat, enabling accurate translation of Just’s multi-line error output into Quickfix entries with detailed file, line, column, and message information. Automated regression tests were added to validate error parsing and plugin behavior, demonstrating a test-driven approach. This feature addressed issue #19773, improving the reliability of in-editor debugging workflows and showcasing skills in Vim plugin development and testing methodologies.