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    Date: 28 Apr 87 22:02:51 PDT
    From: masinter.PA at Xerox.COM

    While current practice is that compilers will warn about undeclared free
    references, I know of no interpreter that does, do you?

The VAX LISP interpreter will generate such warnings if an internal,
unreleased switch is set non-nil.  Its default value is nil.  For a week
or two when the feature first appeared (only inside DEC, of course) the
switch was defaultly true.  Some people liked the immediate feedback,
but overall the warnings were judged too radical and disconcerting, so
the default was changed.