[Haskell-cafe] How to determine correct dependency versions for a library?

Clark Gaebel cgaebel at uwaterloo.ca
Fri Nov 9 19:35:24 CET 2012

I think we just use dependencies different things. This is a problem
inherent in cabal.

When I (and others) specify a dependency, I'm saying "My package will work
with these packages. I promise."
When you (and others) specify a dependency, you're saying "If you use a
version outside of these bounds, my package will break. I promise."

They're similar, but subtly different. There are merits to both of these
strategies, and it's unfortunate that this isn't specified in the PVP [1].

Janek: I've already given my method, and Peter has told you his method.
Pick either, or make your own! Who knows, maybe someone else (or you!) will
have an even better way to deal with this. :)

  - Clark

[1] http://www.haskell.org/haskellwiki/Package_versioning_policy

On Fri, Nov 9, 2012 at 1:03 PM, Peter Simons <simons at cryp.to> wrote:

> Hi Clark,
>  > It's not restrictive.
> how can you say that by adding a version restriction you don't restrict
> anything?
>  > I just don't like to claim that my package works with major versions
>  > of packages that I haven't tested.
> Why does it not bother you to claim that your package can *not* be built
> with all those versions that you excluded without testing whether those
> restrictions actually exist or not?
> Take care,
> Peter
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