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This updates comments only. This patch replaces module references according to new module hierarchy [1][2]. For files under the `compiler/` directory, I replace them as module paths instead of file paths. For instance, `GHC.Unit.State` instead of `compiler/GHC/Unit/State.hs` [3]. For current and future haddock's markup, this patch encloses the module name with "" [4]. [1]: https://gitlab.haskell.org/ghc/ghc/-/wikis/Make-GHC-codebase-more-modular [2]: ghc/ghc#13009 [3]: ghc/ghc!3375 (comment 276613) [4]: https://haskell-haddock.readthedocs.io/en/latest/markup.html#linking-to-modules
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