From Gerd Moellmann, porting Christophe's SBCL's change, with a few
additions to handle the loops (loop for i from 1 to 10 collect i always (< i 20)) (loop ... thereis i collect i) correctly.
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additions to handle the loops (loop for i from 1 to 10 collect i always (< i 20)) (loop ... thereis i collect i) correctly.