Based on the package versioning policy [1], A.B is a major version, so if you know that it works with 1.2, then it is reasonably safe to specify the range >= 1.2 && <1.3, as no major api breaking changes should occur within the 1.2 range (ie, 1.2.1 to 1.2.2, etc)

1. http://www.haskell.org/haskellwiki/Package_versioning_policy#Version_numbers

On Jul 15, 2011, at 10:56 AM, Anthony Cowley wrote:

On Fri, Jul 15, 2011 at 10:48 AM, yi huang <yi.codeplayer@gmail.com> wrote:
I'm writing my first haskell package, how do i determine the minimal
dependency of it, for example, it use Data.Data, how do i know which version
of base package  first introduce Data.Data module, i can't find the answer
with google.

You should specify the minimum version you have tested with.

Anthony

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