Inside 245-5D

Existential Pontification and Generalized Abstract Digressions

Backpack

Open type families are not modular

One of the major open problems for building a module system in Haskell is the treatment of type classes, which I have discussed previously on this blog. I've noted how the current mode of use in type classes in Haskell assume “global uniqueness”, which is inherently anti-modular; breaking this assumption risks violating the encapsulation of […]

  • September 4, 2014

A taste of Cabalized Backpack

Update. Want to know more about Backpack? Read the specification So perhaps you've bought into modules and modularity and want to get to using Backpack straightaway. How can you do it? In this blog post, I want to give a tutorial-style taste of how to program Cabal in the Backpack style. These examples are executable, […]

  • August 26, 2014

What’s a module system good for anyway?

This summer, I've been working at Microsoft Research implementing Backpack, a module system for Haskell. Interestingly, Backpack is not really a single monolothic feature, but, rather, an agglomeration of small, infrastructural changes which combine together in an interesting way. In this series of blog posts, I want to talk about what these individual features are, […]

  • August 9, 2014