OCaml has been getting a lot of mileage from its polymorphic variants
(which allow structural subtyping on sum types) especially on problems
relating to AST transformations and the infamous expression problem.
Has there been any work on extending Haskell's type system with
structural
Al,
Has there been any work on extending Haskell's type system with
structural subtyping?
Koji Kagawaga. Polymorphic variants in Haskell. In Andres Loeh,
editor, Proceedings of the 2006 ACM SIGPLAN Workshop on Haskell,
Portland, Oregon, USA, September 17, 2006, pages 37--47. ACM Press,
I bring this up because I have been working on a Scheme compiler in
Haskell for fun, and something like polymorphic variants would be quite
convinent to allow you to specify versions of the AST (input ast, after
closure conversion, after CPS transform, etc.), but allow you to write
functions that
On Thursday 31 May 2007 15:36:13 Al Falloon wrote:
I bring this up because I have been working on a Scheme compiler in
Haskell for fun, and something like polymorphic variants would be quite
convinent to allow you to specify versions of the AST (input ast, after
closure conversion, after CPS
Mark T.B. Carroll wrote:
I don't know what the infamous expression problem is, nor am I
familiar with polymorphic variants or structural subtyping, but have you
looked at the Data.Generics.* stuff and Scrap Your Boilerplate papers?
They may be relevant.
The expression problem is a new name
On Thursday 31 May 2007, Al Falloon wrote:
OCaml has been getting a lot of mileage from its polymorphic variants
(which allow structural subtyping on sum types) especially on problems
relating to AST transformations and the infamous expression problem.
Has there been any work on extending
stefan:
Al,
Has there been any work on extending Haskell's type system with
structural subtyping?
Koji Kagawaga. Polymorphic variants in Haskell. In Andres Loeh,
editor, Proceedings of the 2006 ACM SIGPLAN Workshop on Haskell,
Portland, Oregon, USA, September 17, 2006, pages
