let deps = [ "base == 4.*" ]

in  { name =
        "when-dependencies"
    , when =
        { condition =
            "impl(ghc < 8.2.2)"
        , `then` =
            { dependencies = deps # [ "yaml" ] }
        , `else` =
            { dependencies = deps # [ "yaml-pretty-extras" ] }
        }
    }