How Claude Code just helped me to find a problem in a Delphi program in 10 Minutes

This article describes how the author used Claude Code, an AI coding assistant, to quickly identify and fix a bug in a Delphi program (a proprietary DIR checker tool). A user reported that measurements with 'R' in the second-to-last position were being ignored. After providing a prompt to Claude Code, it analyzed the source code and pinpointed the root cause: a filter incorrectly checked the wrong character position, causing valid measurements to be dropped. The fix was found in about 5 minutes, demonstrating the effectiveness of AI for debugging niche programming languages like Delphi. The article counters claims that AI only produces 'slop' or fails with less common languages.