GHC Panic On Recompile
Perhaps related to DataKinds or ConstraintKinds, but on rebuild without a clean, the following error is emitted:
Building glyph-0.1...
Preprocessing executable 'glyph' for glyph-0.1...
[34 of 60] Compiling Language.Glyph.HM.InferType ( src/Language/Glyph/HM/InferType.hs, dist/build/glyph/glyph-tmp/Language/Glyph/HM/InferType.p_o )
ghc: panic! (the 'impossible' happened)
(GHC version 7.4.1 for x86_64-unknown-linux):
tyThingTyCon
Data constructor `main:Language.Glyph.Type.Normal{d r3iU}'
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabugThis can be recreated by building this cabal project:
https://github.com/sonyandy/glyph/tree/ghc-panic
To recreate:
git clone https://github.com/sonyandy/glyph/tree/ghc-panic
cabal configure
cabal build
touch src/Language/Glyph/HM/InferType.hs
cabal build