Compiler panic on invalid syntax (unterminated pragma)

The following minimal example causes a compiler panic.

{-# OPTIONS_GHC -O1 }
"
  #-}

ghc-stage2.exe: panic! (the 'impossible' happened)
  (GHC version 8.5.20180413 for x86_64-unknown-mingw32):
        getOptions'.parseToks: Couldn't read "\r\n\"\r\n  " as String

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Happens in HEAD and 8.2.2 at least. Double quotes seem to confuse the parser. Also panics if there are two doublequotes.

Trac metadata

Trac field	Value
Version	8.2.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Parser)
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