[Haskell-cafe] PVP question

[Adam Bergmark]

To be nitpicky myFunction >>= \() -> x would break. It's unlikely that
anyone uses it like this, but I've been on the safe side in the past and
major bumped for cases like this. I think it's unwise to take shortcuts in
the other direction.

- Adam



On Mon, Dec 15, 2014 at 10:44 AM, Johan Tibell <johan.tibell at gmail.com>
wrote:
>
> I think the question is: can this change cause existing code to stop
> compiling (perhaps assuming people aren't using -Werror)? I don't think it
> can but perhaps generalizing the type could make type inference fail
> somewhere due to an ambiguous type.
>
> We really need a PVP guide that just lists lots of examples, each with a
> note of what kind of change it is (i.e. major, minor, or patch).
>
> On Mon, Dec 15, 2014 at 10:00 AM, Michael Snoyman <michael at snoyman.com>
> wrote:
>
>> I'm a little bit uncertain of the PVP guidelines in a certain case[1], so
>> I'd like to get some guidance/clarity. Suppose I have a library which
>> provides the function:
>>
>> myFunction :: IO ()
>> myFunction = forever $ putStrLn "Still here" >> threadDelay 10^6
>>
>> Later, I realize (or someone points out to me) that I've over-specified
>> the type signature, and really myFunction should be:
>>
>>     myFunction :: IO a
>>
>> In this case, does the PVP specify that we should have a minor or a major
>> version bump? I'm not certain if this counts as a breaking change or not.
>>
>> [1] https://github.com/fpco/streaming-commons/pull/13
>>
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