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Breaking Changes and Long Term Support Haskell

libraries list - Wed, 10/21/2015 - 10:33am
There seems to be a fair amount of friction between those who want to introduce new features or fix significant historical warts in the base libraries - even if this requires breaking changes - and those who insist on no significant breaking changes in new releases, regardless of the reason or how much warning was given. The rest of the industry has already solved this with long-term/extended support releases. Some version of the platform is blessed with long-term support, and will continue to receive bug fixes and security patches for a number of years, but no other changes. This solution exists for Haskell as well, in the form of Long-Term Support Haskell ( by FP Complete. Not only GHC but an entire ecosystem of libraries are frozen when a new LTS version is released and only bug/security fixes are allowed going forward. Users requiring long-term stability over new features could use LTS Haskell, while those who accept some fixing up of old code
Categories: Offsite Discussion

PhD and Postdoc Positions - KWARC,Jacobs University Bremen

General haskell list - Wed, 10/21/2015 - 6:17am
The KWARC group [1] at Jacobs University Bremen [2] is looking for Ph.D. candidates and PostDocs in multiple projects, e.g. [3,4]. See also Jacobs University Bremen is a private, English-speaking research university in Germany. The KWARC group conducts research on the representation and management of formal and informal knowledge in the STEM disciplines (Science, Technology, Engineering, and Mathematics). Our interests cover the whole range from formal to informal knowledge and include - logics and foundations of mathematics - formalizing/verifying knowledge - informal and semi-formal documents (specifications, papers, web pages, etc.) - domain-specific applications (spreadsheets, CAD, etc.) - knowledge management (search, user interfaces, system integration, etc.) We build systems that cover these diverse areas uniformly and integrate across domains, languagues, and tools, always combinng logical correctness, wide-range applicabi
Categories: Incoming News

3 release policy

libraries list - Tue, 10/20/2015 - 8:55pm
A "3 release policy" has been recently mentioned several times, whereby it should always be possible to write code that compiles with the last three releases of GHC, without generating any -Wall warnings. The no warning requirement seems excessively harsh. Will early warnings of impending breakage really cause so much trouble that accepted proposals have to be dragged out over several years to avoid them? If so, would a flag to suppress the warnings suffice? I should note that GHC has traditionally had no qualms about introducing new warnings, on by default. -- View this message in context: Sent from the Haskell - Libraries mailing list archive at
Categories: Offsite Discussion

Default definition for fromRational

libraries list - Thu, 10/15/2015 - 11:51pm
A suitable default definition for fromRational could be the following: fromRational n = fromInteger (numerator n) / fromInteger (denominator n) Changing the MINIMUM pragma to just {-# MINIMAL recip | (/) #-} - Joe
Categories: Offsite Discussion

New gtk2hs 0.12.4 release

gtk2hs - Wed, 11/21/2012 - 12:56pm

Thanks to John Lato and Duncan Coutts for the latest bugfix release! The latest packages should be buildable on GHC 7.6, and the cairo package should behave a bit nicer in ghci on Windows. Thanks to all!


Categories: Incoming News