Parse error with "where" and file-ending comment

Consider the following file:

{-# LANGUAGE TypeFamilies #-}

type family F a
type instance where
  F Int = Bool

{-

-}

If there is a file-ending newline, after the comment, the file parses. If there is not a file-ending newline, I get a parse error.

I wrote the code dealing with type instance where notation, but this seems more related to parsing issues (which I know little about) than type instance where. Please correct me if I'm wrong.

Trac metadata

Trac field	Value
Version	7.7
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Parser)
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Parse error with "where" and file-ending comment