# 08-haskell-adt

This example shows intermediate Haskell data modeling with algebraic data types.

It includes:

- sum types for targets, modes, and output style,
- a record type for the full build plan,
- pattern matching in both parsing and description logic, and
- a test suite run by `nix flake check`.

Useful commands:

```bash
nix develop
cabal run
cabal run -- executable release quiet
cabal test

nix build
./result/bin/mini-plan executable release quiet

nix run . -- executable release quiet
nix flake check
```