[GHC] #12414: Ill-formed or incorrect multiline string in compiler/main/GHC.hs

20 Jul 2016

      #12414: Ill-formed or incorrect multiline string in compiler/main/GHC.hs
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           Reporter:  ifigueroap     |             Owner:
               Type:  bug            |            Status:  new
           Priority:  lowest         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Other
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Dear all,

 After trying to (indirectly) parse GHC.hs using hothasktags, I kept
 getting an "Illegal character in string gap" error. After reconstructing
 the file using cpphs I found that the issue is caused by an incorrect
 multiline string in the raw (i.e. before cpp includes) GHC.hs, that trips
 the (perhaps stricter?) parser in haskell-src-exts...

 The following part of the code:

 {{{#!hs
 Nothing -> panic "compileToCoreModule: target FilePath not found in\
                            module dependency graph"
 }}}

 should be

 {{{#!hs
 Nothing -> panic "compileToCoreModule: target FilePath not found in\
                            \module dependency graph"
 }}}

 It seems the issue goes back to several other versions of the file. Of
 course it is not really a big deal, but it was hard to trigger (try to
 parse the file with haskell-src-exts), and to hunt!!

 Best regards

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12414
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler

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