[cvs-nhc98] patch applied (nhc98): Parse and pretty-print pattern guards.

[Malcolm Wallace]

Wed Jun  6 10:10:53 PDT 2007  Malcolm.Wallace at cs.york.ac.uk
  * Parse and pretty-print pattern guards.
  But there is no desugaring of them yet, so compilation will fail with a
  nasty internal error message.

    M ./src/compiler98/Need.hs +2
    M ./src/compiler98/Parse.hs +8
    M ./src/compiler98/PrettySyntax.hs +4
    M ./src/compiler98/Syntax.hs +2