gistfile1.txt

$ cabal-dev build
Building b-0.1.0.0...
Preprocessing library b-0.1.0.0...
[14 of 14] Compiling Data.DynSetMR    ( Data/DynSetMR.hs, dist/build/Data/DynSetMR.o )

Data/DynSetMR.hs:79:23:
    My brain just exploded
    I can't handle pattern bindings for existential or GADT data constructors.
    Instead, use a case-expression, or do-notation, to unpack the constructor.
    In the pattern: Dictionary
    In the pattern: DictValue Dictionary x'
    In a pattern binding: DictValue Dictionary x' = unsafeCoerce x