Marc-André enhanced code analysis capabilities in the semgrep/semgrep repository by improving implicit return detection, specifically targeting real-world patterns in Ruby and Scala. He expanded the static analysis engine to recognize CallSpecial nodes as implicit returns and added support for string interpolation constructs, allowing the tool to analyze more dynamic language features without requiring explicit return statements. Leveraging his expertise in code parsing, compiler design, and testing, Marc-André delivered these changes through robust, traceable commits aligned with internal tracking. His work deepened the tool’s analysis coverage, reducing false negatives and enabling more accurate detection of implicit returns across multiple languages.