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Tom Lord <lord@emf.net> writes: > It seems to me that if you _always_ copy the targeted environment > frame when expanding a "set!" of a local variable, the problem > is entirely eliminated. I'm afraid that this doesn't work. If we're going to copy, we must copy the first time the environment is referenced during memoization. Otherwise we'll have ilocs lingering which refer to a "dead" environment. /mdj