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cargo test --all should run tests in parallel #5609

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Currently if you have a workspace with a lot of crates, cargo test --all runs those tests one crate at a time. This is slow if you have a lot more cores than individual crates can saturate. It would speed things up a lot if cargo could run tests for multiple crates in parallel.

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    A-edition-nextArea: may require a breaking change over an editionArea: may require a breaking change over an editionC-feature-requestCategory: proposal for a feature. Before PR, ping rust-lang/cargo if this is not `Feature accepted`Category: proposal for a feature. Before PR, ping rust-lang/cargo if this is not `Feature accepted`Command-testS-needs-designStatus: Needs someone to work further on the design for the feature or fix. NOT YET accepted.Status: Needs someone to work further on the design for the feature or fix. NOT YET accepted.

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