Worked on the dotnet/csharpstandard repository to expand stackalloc usage in C# 8 and later, focusing on compiler development and language specification. The contribution involved relaxing previous constraints on stackalloc expressions, enabling their use as initializing expressions for pointer-typed or inferred local variables. This required careful updates to both the language specification and supporting documentation to ensure clarity and reduce ambiguity for future users. Using ANTLR and C#, the work delivered a cohesive change that integrated code modifications with documentation updates, resulting in a more flexible and testable language feature that aligns with evolving C# language capabilities and standards.