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After the previous commit, `Settings` is just a thin wrapper around other groups of settings. While `Settings` is used by GHC-the-executable to initalize `DynFlags`, in principle another consumer of GHC-the-library could initialize `DynFlags` a different way. It therefore doesn't make sense for `DynFlags` itself (library code) to separate the settings that typically come from `Settings` from the settings that typically don't.
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