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[no subject]

In system 40.1, with microcode 684, on LISP Machine Nine:

In zmacs, if X is 0. evaluating the follwing with ctl-top-e (with no region)

(DEFVAR Y (SETQ X (1+ X)))

results in X and Y being 2. ie, the expresion is evaluated twice.
If there is a region and ctl-top-e is used all works well.