patch applied (ghc): #1318: lex negative unboxed literals

[Isaac Dupree]

Sat May 26 16:00:45 PDT 2007  Isaac Dupree <id at isaac.cedarswampstudios.org>
  * #1318: lex negative unboxed literals
  I reorganized the lexing of numeric literals a bit so the code didn't
  get too ugly, after trying a few ways, and also considering possible plans
  to be able to conditionally lex negative _boxed_ literals.

    M ./compiler/parser/Lexer.x -28 +48