[GHC] #10993: Bad error message reported when -XBinaryLiterals is not enabled

[GHC]

#10993: Bad error message reported when -XBinaryLiterals is not enabled
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        Reporter:  osa1              |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.11
  (Parser)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by thomie):

 * cc: hvr (added)


Comment:

 Hugs reports a similar error: Undefined variable "b10101". So I'm guessing
 the haskell report dictates `0b0101` should be parsed as 2 tokens (but I'm
 having difficulties finding out where it would say so exactly), and this
 would be a breaking change.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10993#comment:1>
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