Incorrectly suggests RankNTypes for ill-formed type "forall a. Eq a. Int"

baldur@Loki:~$ ghci -ignore-dot-ghci
GHCi, version 8.1.20160117: http://www.haskell.org/ghc/  :? for help
Prelude> let foo :: forall a. Eq a. Int; foo = undefined

<interactive>:1:20: error:
    Illegal symbol '.' in type
    Perhaps you intended to use RankNTypes or a similar language
    extension to enable explicit-forall syntax: forall <tvs>. <type>
Prelude> :set -XRankNTypes 
Prelude> let foo :: forall a. Eq a. Int; foo = undefined

<interactive>:3:26: error:
    Illegal symbol '.' in type
    Perhaps you intended to use RankNTypes or a similar language
    extension to enable explicit-forall syntax: forall <tvs>. <type>
Prelude> 

also

Prelude> :kind forall a. Eq a. Int

<interactive>:1:15: error:
    Illegal symbol '.' in type
    Perhaps you intended to use RankNTypes or a similar language
    extension to enable explicit-forall syntax: forall <tvs>. <type>

Trac metadata

Trac field	Value
Version	8.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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