0.8.7.1:

0.8.7.1:
        * Fix PFD's MISC.184
        ... new kind of a deleted function: :ZOMBIE = effectless LET;
        ... DELETE-LAMBDA is used only for a deletion of an
            unreachable functions;
        ... for a LET-like lambda DELETE-LAMBDA deletes its BIND
            block;
        ... DO-NODES-BACKWARDS stops iteration when the traversed
            block is to be deleted.