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由 bors 提交于
incr.comp.: Make cross-crate tracking for incr. comp. opt-in. The current implementation of cross-crate dependency tracking can cause quite long compile times and high memory usage for some crates (see #39208 for example). This PR therefore makes that part of dependency tracking optional. Incremental compilation still works, it will only have very coarse dep-tracking for upstream crates. r? @nikomatsakis
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