Re: [Haskell-cafe] Test cases for type inference

Thanks Job & Martijn for the feedback. I would like to write a type inferrer that is mostly Haskell 98 with Trex row polymorphism extensions (a bit like CAL I guess). That will certainly take a while because I'm also studying the theory in my spare time. So as soon as (or if) I have something working, I will need a larger set of tests. So Job, no need to do put any effort in preparing test sets, but I highly appreciate your offer. Cheers, Peter On Wed, Oct 21, 2009 at 4:47 PM, Job Vranish wrote:

I was recently working on an type inference algorithm and to test it I did the following:   Used the quickcheck Arbitrary typeclass to generate expressions   Inferred types of the expressions using my algorithm,   converted the expressions that passed inference to haskell and wrote them to a file (without type signatures)   converted and wrote the failed expression to a separate file   compiled the "passed" file with -Wall, and extracted all the type signatures that were spit out as warnings   parsed the type signatures that -Wall spit out and compare with the signatures generated by my algorithm.   compiled the "failed" file and make sure I get type errors for all my expressions

My algorithm also infers infinite types (which haskell does not) so I had to test that functionality manually.

Overall it was kinda messy, but it worked ok.

I could possibly send you one of my lists. My test expressions are all very simple, no type classes, only 2 types (function and number), and the only expression components are let, lambda, apply, identifier, and number. If something like that would work, let me know.

Hope that helps,

- Job

On Tue, Oct 20, 2009 at 10:07 AM, Peter Verswyvelen wrote:

...

For learning, I would like to develop my own implementation of type inference, based on the paper "Typing Haskell in Haskell".

At first sight, the source code of THIH contains a small number of tests, but I was wandering if a large test set exist?

Thanks, Peter _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe