Row Polymorphism in Damas-H: Understanding Let Polymorphism and Unification

In a recent blog post, the concept of row polymorphism in Damas-H was explored. This type system feature allows for generic programming over rows, enabling more flexible and expressive code. The post delved into let polymorphism, explaining how unbound type variables get generalized with a forall, allowing functions to be generic over one or more type variables.

The article also discussed the process of unification in row polymorphism, highlighting the importance of matching field names and types pairwise. Four cases were presented, demonstrating how rows can end up with the same fields and rest type after unification.

Source: https://bernsteinbear.com/blog/row-poly/