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!
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.0.2 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler (Type checker) |
| Test case | |
| Differential revisions | |
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| Blocking | |
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| Operating system | |
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