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65cd843ae0
Run a single huge par_body_owners instead of many small ones after each other. This improves parallel rustc parallelism by avoiding the bottleneck after each individual `par_body_owners` (because it needs to wait for queries to finish, so if there is one long running one, a lot of cores will be idle while waiting for the single query).
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.