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由 Ulrik Sverdrup 提交于
.copy_from_slice() does the same job of .clone_from_slice(), but the former is explicitly for Copy elements and calls `memcpy` directly, and thus is it efficient without optimization too.
2d6496dd
.copy_from_slice() does the same job of .clone_from_slice(), but the former is explicitly for Copy elements and calls `memcpy` directly, and thus is it efficient without optimization too.