During January 2026, Pierre Legall contributed to the elixir-lang/elixir repository by enhancing the List module with safer list access functions. He developed and merged List.first!/1 and List.last!/1, which provide explicit error handling when accessing the first or last element of an empty list. This work aligned with Elixir’s safety-first philosophy and improved the ergonomics of common list operations. Pierre applied his expertise in Elixir, functional programming, and testing to ensure robust implementation and clear error signaling. The depth of this contribution lies in its targeted improvement to core library usability, though the scope was limited to a single feature.