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Makes the `dead_code` lint a citizen of stage0 to silence the "unknown lint"
warnings.
auto merge of #10882 : jhasse/rust/patch-1, r=metajack

typo
auto merge of #10886 : alexcrichton/rust/snapshots, r=huonw

Makes the `dead_code` lint a citizen of stage0 to silence the "unknown lint"
warnings.