• Francois-Rene Rideau's avatar
    Correctly track status of actions across phases · 40b86923
    Francois-Rene Rideau authored
    Do not perform an action twice in a session. Introduce three status bits
    that every action has in a given session, in addition to the stamp:
    KEEP-P (from previous session), DONE-P (and up-to-date, in this image),
    NEED-P (needed in this image as part of this session).
    
    BACKWARD INCOMPATIBILITY: Invert the meaning of NIL and T for STAMP,
    so that NIL means out-of-date. This makes our code conceptually nicer,
    and no one in Quicklisp uses our stamps, anyway. Still, beware.
    40b86923
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