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As has been pointed out a few times in the past (e.g., #4036 (comment)), each-feature is not sufficient for features check. Ideally, we'd like to check all combinations of features, but there are too many combinations. So limit the max number of simultaneous feature flags to 2 by --depth option. I think this should be sufficient in most cases as @carllerche said in taiki-e/cargo-hack#58.