While reading section 13.3.1.2 of the standard I have found the
following funny thing about the built-in candidates for overload
resolution (operators referenced in expressions):

 "For all other operators [other than ,, unary & and ->], the built-in
  candidates include all of the candidate operator functions defined
  in 13.6 that, compared to the given operator,
       - have the same operator name, and
       - accept the same number of operands, and
       - accept operand types to which the given operand or
         operands can be converted according to 13.3.3.1, and
       - do not have the same parameter type list as any
         non-template non-member candidate."


Now, what puzzles me are the second and third bullet: usually those
criteria are used to select the subset of viable functions. In this
case instead, we apply them immediately. That is we start directly
with a restricted set of candidates that excludes what would be non
viable candidates. Why those rules?

Genny.

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