[GHC] #12884: Parsing of literate files fails because of special character (#)

[GHC]

#12884: Parsing of literate files fails because of special character (#)
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        Reporter:  bales             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
  (Parser)                           |
      Resolution:                    |             Keywords:  literate
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Description changed by bales:

@@ -4,0 +4,2 @@
+ Note: this error is only triggered when the sharp is the first character
+ on the line.

New description:

 A sharp sign (#) in the documentation part of a literate haskell file
 causes the parser to fail. As I understand it, any line that doesn't start
 with a greater-than sign should be ignored.
 Note: this error is only triggered when the sharp is the first character
 on the line.

 {{{#!hs
 #+

 > module Empty where
 }}}

 The previous code leads to the following error:

 with ghc-7.8.3: Bug.lhs:1:2: lexical error at character '+'[[BR]]
 with ghc-8.0.1: Bug.lhs:1:1: error: parse error on input ‘#+’

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12884#comment:1>
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