Neil Mitchell's Blog (Haskell etc)

Summary: I recommend people use the Haskell Language Server IDE. Just over a year ago, I recommended people looking for a Haskell IDE exper...

Interviewing usually involves some level of subjectivity. I once struggled to decide about a candidate, and after some period of reflection,...

Summary: Hoogle searches packages on Stackage. Haskell (as of 27 July 2020) has 14,490 packages in the Hackage package repository . Hoogle ...

Summary: You can divide extensions into yes, no and maybe, and then use HLint to enforce that. I've worked in multiple moderately sized ...

Summary: In previous companies I had a lot of freedom to design an interview. This article describes what I came up with. Over the years, I...

Summary: Run cmdargs-browser hlint and you can fill out arguments easily. The Haskell command line parsing library cmdargs contains a data...

Summary: I came up with a clever trick to encode lifetimes of allocated values in Rust. It doesn't work. Let's imagine we are using ...

Summary: HLint has a match engine which powers most of the rules. The Haskell linter HLint has two forms of lint - some are built in writt...

Summary: Hoogle 5 has three interesting parts, a pipeline, database and search algorithm. The Haskell search engine Hoogle has gone through...

Summary: IO evaluation caught me off guard when trying to write some benchmarks. I once needed to know a quick back-of-the-envelope timing o...

Summary: HLint --cross was accidentally quadratic in the number of files. One of my favourite blogs is Accidentally Quadratic , so when th...

Summary: A performance investigation uncovered a memory leak in unordered-containers and performance issues with Ghcide. Over the bank holid...

Summary: The new version of Shake has some tweaks to how stdin works with cmd . I've just released Shake 0.19 , see the full change log ...

Summary: Four improvements to Haskell I'm not going to raise as GHC proposals. Writing a GHC proposal is a lot of hard work. It require...

Summary: It is useful to trace files accessed by a command. Shake and FSATrace provide some tools to do that. When writing a build system, i...

Summary: HLint 3.0 uses the GHC parser. In June 2019 I posted about our intention to move HLint to the GHC parser. Since then a small group...

Summary: Interpretation by closure is a lot faster than I expected. Let's imagine we have an imperative language (expressions, assignmen...