patch applied (ghc): Fix printing of splices; part of #4124

[Ian Lynagh]

Sun Jun 13 08:48:38 PDT 2010  Ian Lynagh <igloo at earth.li>
  * Fix printing of splices; part of #4124
  Just putting parens around non-atomic expressions isn't sufficient
  for splices, as only the $x and $(e) forms are valid input.

    M ./compiler/hsSyn/HsExpr.lhs -2 +10

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20100613154838-3fd76-779a4942b135e9d02e23ff67aae4edac00796023.gz