[cvs-nhc98] patch applied (yhc): Fix a few bugs in collectFreeVars, the \\ operator only removes one occurrence, now nub is done on the lhs of the \\ to make sure all variables are removed

[Neil Mitchell]

Wed Aug  8 07:41:06 PDT 2007  Neil Mitchell
  * Fix a few bugs in collectFreeVars, the \\ operator only removes one occurrence, now nub is done on the lhs of the \\ to make sure all variables are removed

    M ./src/libraries/core/Yhc/Core/FreeVar3.hs -6 +7