1.0.60
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Greatly reduce test execution time by compiling test cases in parallel on toolchains which support rust-lang/cargo#10496. Example from the serde crate's test suite, which becomes 16x faster on my machine:
Before:
$ time cargo test --test compiletest real 0m21.442s user 0m15.288s sys 0m6.317s
After:
$ time cargo test --test compiletest real 0m1.290s user 0m20.761s sys 0m6.962s