ezyang’s blog

the arc of software bends towards understanding

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May, 2016

Debugging tcIfaceGlobal errors in GHC: a study in interpreting trace output

I recently solved a bug where GHC was being insufficiently lazy (yes, more laziness needed!) I thought this might serve as a good blog post for how I solve these sorts of laziness bugs, and might engender a useful conversation about how we can make debugging these sorts of problems easier for people. Hark! A […]

Announcing cabal new-build: Nix-style local builds

cabal new-build, also known as “Nix-style local builds”, is a new command inspired by Nix that comes with cabal-install 1.24. Nix-style local builds combine the best of non-sandboxed and sandboxed Cabal: Like sandboxed Cabal today, we build sets of independent local packages deterministically and independent of any global state. new-build will never tell you that […]