>I expect it is because class files are binaries, and the & command is inline, hence only works in the "interpreted" .prg files.. ie. & means "dont compile it because it will be different sometimes".. which in a file which is compiled (ie a class file) is illegal.
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>.. maybe

Or, maybe not. Sorry, but that's total nonesense, and terribly wrong. It's on thing to speculate but in this case it would have been quite simple to check before posting.