#6015: "No instance" when using PolyKinds/DataKinds/FunDeps/Undecidable
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Reporter: atnnn | Owner:
Type: feature request | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.4.1
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: GHC rejects valid program
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by atnnn):
Replying to [comment:2 simonpj]:
> That's odd. Even with `PolyKinds` on the program typechecks for me.
Are you using the latest HEAD?
I tried again with the latest HEAD.
As before, the code compiles fine and the `No instance` error appears only
when trying to evaluate `foo`.
Also, I forgot to add the required `FlexibleContexts`.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6015#comment:3>
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