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The Coverity Prevent NEGATIVE_RETURNS and REVERSE_NEGATIVE checkers can all both find violations of this rule. The NEGATIVE_RETURNS checker can find array accesses, loop bounds, and other expressions which may contain dangerous implied integer conversions that would result in unexpected behavior. The REVERSE_NEGATIVE checker can find instances where a negativity check occurs after the negative value has been used for something else. Coverity Prevent cannot discover all violations of this rule so further verification is necessary.
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