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由 Huon Wilson 提交于
Previously it would call: f(sf1.cmp(&of1), f(sf2.cmp(&of2), ...)) (where s/of1 = 'self/other field 1', and f was std::cmp::lexical_ordering) This meant that every .cmp subcall got evaluated when calling a derived TotalOrd.cmp. This corrects this to use let test = sf1.cmp(&of1); if test == Equal { let test = sf2.cmp(&of2); if test == Equal { // ... } else { test } } else { test } This gives a lexical ordering by short-circuiting on the first comparison that is not Equal.
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