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- A (possible) overhaul of GHC's build system to use **Shake** instead of Make.
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- Support for reasoning about kind equalities, which gives promotion of GADTs to kinds, kind families, heterogeneous equality (kind-indexed GADTs), and `* :: *`. There is some discussion in [DependentHaskell/Phase1](dependent-haskell/phase1), but that's very low-level. I (Richard) have no good user-oriented write-up yet, but there shouldn't be much in the way of new syntax -- just fewer type errors.
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- A new, type-indexed type representation, `data TTypeRep (a :: k)`. This change should be fully backward compatible. See [Typeable](typeable).
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- More Backpack is chugging along; we have a new user-facing syntax which allows multiple modules to be defined a single file, and are hoping to release at least the ability to publish multiple "units" in a single Cabal file.
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## Migration Guide to 7.12
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