# 10-haskell-effects

This example shows intermediate Haskell application structure with `ReaderT` and `Except`.

It includes:

- an environment record carried by `ReaderT`,
- an explicit domain error type carried by `Except`,
- `MonadReader` and `MonadError` constraints on library functions, and
- a test suite run by `nix flake check`.

Useful commands:

```bash
nix develop
cabal run
cabal run -- haskell
cabal test

nix build
./result/bin/mini-effects haskell

nix run . -- haskell
nix flake check
```