*Top picks:* Jasper Van der Jeugt http://jaspervdj.be/posts/2015-02-24-lru-cache.html shows how you can write an intuitive, obviously correct LRU cache perfectly polymorphic in both the key and value types of the cache lookup function. (Reddit discussion.) http://www.reddit.com/r/haskell/comments/2wz4tj/writing_an_lru_cache_in_hask... Core is broken! Well, no, ticket 9858 https://ghc.haskell.org/trac/ghc/ticket/9858 reported previously is still open, and it's about translating an exotic species of Haskell into Core. But Javran Cheng https://ghc.haskell.org/trac/ghc/ticket/10121 found out that the documented specification of Core's operational semantics is incomplete. Neil Mitchell http://neilmitchell.blogspot.com/2015/02/making-withsocketsdo-unnecessary.ht... removes the error-prone wart of withSocketsDo http://hackage.haskell.org/package/network-2.6.0.2/docs/Network.html#v:withS... in Windows network programming. Moving in for the kill is the triple combo of evaluate, NOINLINE, and unsafePerformIO. (Reddit discussion.) http://www.reddit.com/r/haskell/comments/2x7js6/making_withsocketsdo_unneces... Can you write a sorting algorithm? Can you write a fancy sorting algorithm? Can you write a sorting algorithm so fancy it hides a subtle bug? Can you write a sorting algorithm so fancy that it hides a bug so subtle https://github.com/timjb/haskell-timsort/commit/d9c3e1e454c7d338320f8c2aa12e... that it evades even QuickCheck because the smallest testcase is 2^49 big? But the good news is that QuickCheck doesn't see any regression in the bugfix. (Hacker News discussion.) https://news.ycombinator.com/item?id=9100107#up_9112425 The consequence of misspelling pragmas https://ghc.haskell.org/trac/ghc/ticket/10106, Or: when stumped on a compile error, turn on -Werror to see if you aren't missing something obvious. *Quote of the week:*garry__cairns https://twitter.com/garry__cairns/status/571087073739976704: The trouble with learning #haskell is the more I expose myself to it the more I dislike what I have to work with to pay the bills. *Repo of the week: *Kalium https://github.com/int-index/kalium: Turn Pascal https://int-index.github.io/kalium/examples.html into Haskell -- Kim-Ee