Bryant Mairs d2508e3a44 Use single threads for testing
I actually couldn't find a reference to CARGO_TEST_THREADS in the
current cargo codebase, but RUST_TEST_THREADS is definitely correct.
This should reduce some spurious failures on some platforms.
2017-07-03 12:45:07 -07:00

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[build.env]
passthrough = ["RUST_TEST_THREADS"]