[GHC] #15053: Compiler panic on invalid syntax (unterminated pragma)

[GHC]

#15053: Compiler panic on invalid syntax (unterminated pragma)
-------------------------------------+-------------------------------------
           Reporter:  AndreasK       |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.2.2
  (Parser)                           |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Compile-time
  Unknown/Multiple                   |  crash or panic
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 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.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15053>
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