Error message suggests applying (non-existant) function to more arguments

Applying a constraint that doesn't hold fails, this is expected

$ ~/code/qc-ghc/inplace/bin/ghc-stage2 --interactive -ignore-dot-ghci
GHCi, version 8.5.20180128: http://www.haskell.org/ghc/  :? for help
Prelude> :set -XGADTs -XConstraintKinds -XTypeApplications 
Prelude> data Dict c where Dict :: c => Dict c
Prelude> data A
Prelude> :t Dict @(Eq A)

<interactive>:1:1: error:
    No instance for (Eq A) arising from a use of ‘Dict’

but for (Eq (Int -> Int)) GHC additionally suggests maybe applying a function (what function?) to more arguments

Prelude> :t Dict @(Eq (Int -> Int))

<interactive>:1:1: error:
    No instance for (Eq (Int -> Int)) arising from a use of ‘Dict’
      (maybe you haven't applied a function to enough arguments?)
Prelude> 

Trac metadata

Trac field	Value
Version	8.5
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture