Development environment

cd my-haskell-project
ghc --version
nix develop
ghc --version

Build and run

nix build
cabal build
./result/bin/speed-functions-test

nix run .#speed-functions-test
cabal test speed-functions-test
cabal test
nix flake check

nix flake metadata
nix flake show
nix flake update

cabal update