[GHC] #10444: Text.Read.Lex.lex broken (was: Tex.Read.Lex.lex broken)

[GHC]

#10444: Text.Read.Lex.lex broken
-------------------------------------+-------------------------------------
        Reporter:  strake888         |                   Owner:  ekmett
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Core Libraries    |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
                                     |  Phab:D1122.
-------------------------------------+-------------------------------------
Description changed by bgamari:

Old description:

> {{{
> Prelude> lex "&) = mempty"
> [("&",") = mempty")]
> Prelude> lex "∘) = mempty"
> []
> }}}
>
> I traced this problem to Text.Read.Lex.lex

New description:

 {{{
 Prelude> lex "&) = mempty"
 [("&",") = mempty")]
 Prelude> lex "∘) = mempty"
 []
 }}}

 I traced this problem to Text.Read.Lex.lex

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10444#comment:9>
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