Let parseModule take a ModSummary like checkAndLoadModule did.
To get the ModSummary for a ModuleName getModSummary can be used. It's not called find* or lookup* because it assumes that the module is in the module graph and throws an exception if it cannot be found. Overall, I'm not quite sure about the usefulness of this function since the user has no control about which filetype to grab (hs or hs-boot).
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