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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
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  • #13409
Closed
Open
Issue created Mar 10, 2017 by Ryan Scott@RyanGlScottMaintainer

Data types with higher-rank kinds are pretty-printed strangely

First observed in #13399 (closed)##13409 (closed). If you define this:

data Foo :: (* -> *) -> (forall k. k -> *)

and type :i Foo into GHCi, you get this back:

type role Foo phantom nominal phantom
data Foo (a :: * -> *) k (c :: k)

This seems to imply that Foo has three visible type parameters, which isn't true at all!

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Version 8.0.2
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler (Type checker)
Test case
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