Actually, I'm seriously surprised no one's ever bumped into such a general use case (myself included).
My guess is most people aren't aware of $&. That, coupled with the fact that there tend to be better ways to split statements up into multiple lines, and the fact that most scripters don't seem to care how long their lines are (see some pastes in the Scripting section of this forum for examples of rampant long line abuse), lead to a pretty low chance of this having been used in a while loop by someone who actually spends the time to report bugs. I should point out, the people who spend time to report bugs are already in the minority
