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ekmett / hask

Category theory for Haskell with a lens flavor (you need GHC 7.8.3, not 7.8.2 to build this!)
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Fails to build on GHC 7.10.1 #5

Open roboguy13 opened 9 years ago

roboguy13 commented 9 years ago

When I try to build it, I get the following output from cabal: https://gist.github.com/roboguy13/2cba2baebdfaba033cbe

int-index commented 9 years ago

This is what I get on GHC 7.10.2:

[9 of 9] Compiling Hask.Adjunction  ( src/Hask/Adjunction.hs, dist/build/Hask/Adjunction.o )

src/Hask/Adjunction.hs:31:14:
    The second argument of ‘Dom2’ should have kind ‘i1’,
      but ‘p a b’ has kind ‘j1’
    In the type ‘Iso (->) (->) (->) (Dom2 p (p a b) c) (Dom2 p (p a' b') c') (Dom2 q a (q b c)) (Dom2 q a' (q b' c'))’
    In the class declaration for ‘Curried’
glguy commented 9 years ago

The description of this repository mentions:

Category theory for Haskell with a lens flavor (you need GHC 7.8.3, not 7.8.2 to build this!)

Hask is highly experimental and probably shouldn't be considered "supported"

int-index commented 9 years ago

@glguy I think it means that there were bugfixes in GHC 7.8.3 (compared to GHC 7.8.2) necessary for this project to compile and work properly. There is no mention of GHC 7.10.*, and it makes sense to keep the project up to date with the latest compiler.

ekmett commented 3 years ago

The Any trick used by this package to inject new type constructors into existing kinds isn't available any more. Simon fixed it explicitly to stop me from doing this.

Nowadays you need to use stuck data families instead to achieve the same result.