replace `nix-shell` with Nix Flake · haskell-beam/beam@a1aebc8

ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see https://github.com/actions/runner-images/issues/10636

The import of ‘Control.Applicative’ is redundant

Module ‘Control.Monad.Writer’ does not export ‘(<>)’.

The import of ‘Control.Monad.Identity’ is redundant

Pattern match is redundant

The import of ‘Control.Applicative’ is redundant

Module ‘Control.Monad.Writer’ does not export ‘(<>)’.

The import of ‘Control.Applicative’ is redundant

• Deriving ‘Typeable’ has no effect: all types now auto-derive Typeable

• Deriving ‘Typeable’ has no effect: all types now auto-derive Typeable

In the use of ‘head’

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