Explore a work-in-progress presentation on binding syntax for dependently-typed programs in the Idris compiler. Delve into the importance of binders in dependently-typed programming, focusing on types like Σ and Π. Learn about the efforts to introduce custom binders with arbitrary syntax extension while maintaining a fixed grammar to enable precise error messaging. Gain insights into the challenges and potential benefits of this approach for improving the ergonomics of dependently-typed programming languages.