nix-playgraound/11-haskell-typeclasses/README.md

11-haskell-typeclasses

This example shows intermediate Haskell abstraction with a custom type class and several instances.

It includes:

• a custom Renderable type class,
• instances for domain types and a report wrapper,
• a small CLI that uses one shared rendering interface, and
• a test suite run by nix flake check.

Useful commands:

nix develop
cabal run
cabal run -- production failed 2
cabal test

nix build
./result/bin/mini-render production failed 2

nix run . -- production failed 2
nix flake check