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If the same value is used multiple times in the same instruction, CaptureTracking may end up reporting the wrong use as being captured, and/or report the same use as being captured multiple times. Make sure that all checks take the use operand number into account, rather than performing unreliable comparisons against the used value. I'm not sure whether this can cause any problems in practice, but at least some capture trackers (ArgUsesTracker, AACaptureUseTracker) do care about which call argument is captured.
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