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This flag undoes the effect of a previous "-haddock" flag. Having both flags makes it easier for build systems to enable Haddock parsing in a set of global flags, but then disable it locally for specific targets (e.g., third-party packages whose comments don't pass the validation in the latest GHC). I added the flag to expected-undocumented-flags.txt since `-haddock` was alreadyin that list.
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