Hi Joh-Tob,

> Doesn't 'circ? also set the gc bit?

Well observed!! That't true, but it is the "other" mark bit. While gc uses the
bit in the CDR

   or (X CDR) 1  # Set mark bit

uses 'circ' the one in the CAR of the cell

   or (A) 1  # Mark

> Could it be possible that 'circ? evaluates a term which accesses something
> with a changed pointer?

The bits are only set after all evaluation is done, and the raw circ detection
processing runs. Then the bits are cleared (as after garbage collection too).

♪♫ Alex
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