[GHC] #10092: lex doesn't handle binary literals

15 Feb 2015

      #10092: lex doesn't handle binary literals
-------------------------------------+-------------------------------------
              Reporter:              |             Owner:
  RyanGlScott                        |            Status:  new
                  Type:  bug         |         Milestone:
              Priority:  normal      |           Version:  7.10.1-rc2
             Component:              |  Operating System:  Unknown/Multiple
  libraries/base                     |   Type of failure:  Incorrect result
              Keywords:              |  at runtime
          Architecture:              |        Blocked By:
  Unknown/Multiple                   |   Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
 The {{{lex}}} function from {{{Text.Read.Lex}}} (on which the {{{Read}}}
 instance for {{{Lexeme}}} is based) can't read binary literals on GHC
 7.10.1-rc2:

 {{{
 $ ghci -XBinaryLiterals
 GHCi, version 7.10.0.20150123: http://www.haskell.org/ghc/  :? for help
 λ> 0b101010
 42
 λ> import Text.Read.Lex
 λ> read "0b101010" :: Lexeme
 *** Exception: Prelude.read: no parse
 }}}

 This should be a simple fix, but I'm not sure if this is the intended
 behavior or not, since {{{BinaryLiterals}}} isn't a part of the Haskell
 2010 standard (and I'm not sure how closely {{{lex}}} adheres to that).

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10092
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler