[GHC] #10253: Variable name with special characters

[GHC]

#10253: Variable name with special characters
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              Reporter:  songzh      |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:
             Component:  Compiler    |           Version:  7.10.1
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |        Blocked By:
             Test Case:              |   Related Tickets:
              Blocking:              |
Differential Revisions:              |
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 Declaring a variable in GHCi with $ . is allowed, but they are not
 referable.
 I suppose that the parser should impose more restrictions at this.

 {{{#!hs
 *Main> let a$1 = 10
 *Main> a$1
 <interactive>:20:1: Not in scope: ‘a’

 Prelude> let a.1 = 10
 Prelude> a.1

 <interactive>:9:1: Not in scope: ‘a’

 Prelude> let a%1 = 1
 Prelude> a%1
 1
 Prelude> let a^1 = 1
 Prelude> a^1
 1
 Prelude> a^1 + 1
 2

 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10253>
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