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Mikael Djurfeldt <mdj@nada.kth.se> writes: > Jim, we'll need your tortoise and hare... But note that the correct response on circularity is simply to return a new circular structure, not an error message. Since the tortoise and hare isn't suitable to detect the location of the "first" circular reference, we should probably do something similar to the solution in the printer: We'll have two versions of copy-tree, one fast which can't handle circularity and one which can. `copy-tree' will first run a pair-and-vector tortoise and hare to determine circularity. Then it selects the appropriate version of the copying algorithm. /mdj