[Haskell-cafe] The instability of Haskell libraries

[John Goerzen]

David Menendez wrote:
> On Fri, Apr 23, 2010 at 10:11 PM, John Goerzen <jgoerzen at complete.org> wrote:
>> Don Stewart wrote:
>>> Oh, the Platform has very strict standards about APIs,
>>>
>>> When a package may be added:
>>>    http://trac.haskell.org/haskell-platform/wiki/AddingPackages
>> That looks like a very solid document.  Does it also apply when considering
>> upgrading a package already in the platform to a newer version?
>>
>> Also, I notice that http://haskell.org/haskellwiki/Package_versioning_policy
>> does not mention adding new instances, which caused a problem in the past.
>>  I would argue that this ought to mandate at least a new A.B.C version, if
>> not a new A.B.
> 
> Adding or removing instances requires a new major version. See section 2:
> 
> | If any entity was removed, or the types of any entities or the definitions of
> | datatypes or classes were changed, or instances were added or removed,
> | then the new A.B must be greater than the previous A.B.
> 

Ah, sorry.  Read it too quickly I guess.