Haskell-Source with Extensions (HSE, haskell-src-exts) is an extension
of the standard haskell-src package, and handles most registered
syntactic extensions to Haskell, including:
* Multi-parameter type classes with functional dependencies
* Indexed type families (including associated types)
* Empty data declarations
* GADTs
* Implicit parameters
* Template Haskell
[..]
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