Visible kind applications + data family: `U :: Type' said to be of kind `k0 -> k1` in error message

Using the visible kind applications (D5229) (#12045 (closed)) patch.

GHC erroneously calls U :: Type a "function" of kind k0 -> k1 if I understand this right,

$ ghci 
GHCi, version 8.7.20181017: http://www.haskell.org/ghc/  :? for help
Prelude> :set prompt "> "
> import Data.Kind (Type)
>
> :set -XTypeFamilies 
> :set -XTypeApplications
>
> data family   U      :: Type
> data instance U @Int

<interactive>:7:1: error:
    • Cannot apply function of kind ‘k0 -> k1’
      to visible kind argument ‘Int’
    • In the data instance declaration for ‘U’
> 

I expect something like "Cannot apply type U to visible kind argument Int" or

> data instance U Int = MkU

<interactive>:7:1: error:
    • Expected kind ‘* -> *’, but ‘U’ has kind ‘*’
    • In the data instance declaration for ‘U’
> 

Trac metadata

Trac field	Value
Version	8.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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