Neil Mitchell's Blog (Haskell etc)

Summary: For large data types, deriving Generic can take a long time to compile. I was building GHC using Hadrian , and part of that proce...

On behalf of Digital Asset I'm delighted to announce ghc-lib , a repackaging of the GHC API to allow it to be used on different GHC ver...

Summary: HLint detects unused extensions in LANGUAGE pragmas, including over 17,000 on Hackage. HLint has detected unused LANGUAGE pragma...

Summary: There are two steps that delay new versions of packages in Stackage. I aim to get the latest version of my software out to as many ...

Summary: HLint now has more ways to ignore hints you don't like. HLint makes suggestions about how to improve your Haskell code. But no...

Summary: The story of another bug, from report, patch, revisions, to merge. I recently posted the story of a GHC bug that took 3 months to ...

Summary: The story of a bug, from report, proposal, patch, revisions, to merge. A while ago I found a bug in GHC . Like all good bugs, this ...

Summary: Haskell uses :: as the type operator. That was a mistake that costs us over 1 million characters of source code. Haskell uses :: f...

Summary: I wanted to download the latest version of every package in Hackage. Here's a script and explanation of how to do it. Imagine y...

Summary: profiterole reformats GHC profile reports so they are easier to read. Do you often work with GHC time profiling reports? Do you fi...

I'm delighted to announce Shake 0.17. As always, the full changelog is on GitHub , but I'd like to highlight three areas that have s...

UPDATE: All positions have been filled. Summary: We're hiring 3 Haskell programmers and a few other roles too. I am currently workin...

Summary: I like mine. I've worn a watch since I was 10, starting with a Casio F-91W , replacing it with an identical model about seven t...

Summary: I plan to license all future packages under the "BSD-3-Clause OR Apache-2.0" license. A few weeks ago I calculated that t...

Summary: How we went about writing a build systems comparison paper, how we learnt what we learnt, and why the end result surprised us. A gl...

Summary: I no longer develop Bake, my continuous integration tool. In 2014 I started a new project of a continuous integration system, name...

Summary: I made some t-shirts. For Christmas my brother-in-law got me the classic "Don't Fear the Monads" t-shirt, which co...

Summary: I've just released ghcid-0.7, which provides a much better user experience, including colors. Ghcid is now over three years ol...

Summary: I hacked Cabal so I could spot where I was missing package lower bounds. The approach has lots of limitations, but I did find one m...

Summary: The safe library now provides error messages with short and informative stack traces on errors. The Haskell base library contain...