[Pl-seminar] 6/4: Scott Kilpatrick, Backpack: Retrofitting Haskell with Interfaces

Vincent St-Amour stamourv at ccs.neu.edu
Sat Jun 1 10:11:30 EDT 2013

Reminder: Scott Kilpatrick will be giving a talk on Tuesday at *10:30*.


At Thu, 23 May 2013 11:27:49 -0400,
Vincent St-Amour wrote:
> NEU Programming Languages Seminar presents
> Scott Kilpatrick
> Tuesday, 6/4
> 10:30-12:00
> Room 366 WVH (http://www.ccs.neu.edu/home/wand/directions.html)
> Backpack: Retrofitting Haskell with Interfaces
> Module systems like that of Haskell permit only a limited form of
> modularity in which module implementations directly depend on other
> implementations and must be processed in dependency order.  Module
> systems like that of ML, on the other hand, permit a stronger form of
> modularity in which explicit interfaces express assumptions about
> dependencies, and each module can be typechecked and reasoned about
> independently.  Though the stronger modularity is more beneficial to
> developers, it requires a language (and implementation) of module
> linking -- a concept which does not exist in languages like Haskell.
> In this talk I present a design for a typed language of packages for
> the Haskell programming language, called Backpack, based on the module
> system design of mixins.  Primarily due to the addition of typed
> module interfaces, Backpack enjoys the stronger, ML-style modularity,
> but because this functionality is provided at the "package" (rather
> than the "module") level, it does not require any real change to the
> existing Haskell module system infrastructure.  In particular we give
> a clean elaboration from Backpack expressions to sets of Haskell
> module files, thus showing how Backpack maintains interoperability
> with the existing Haskell module system.
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