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Document RUST_TEST_TASKS in the "book" #22334

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@scott-ainsworth

Just discovered that unit tests are run in parallel (because of spurious failures). Suggest documenting this and the RUST_TEST_TASKS environment variable in the "Testing" section of "The Rust Programming Language" book. This suggestion will help answer #16330.

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  1. steveklabnik commented on Feb 14, 2015

    @steveklabnik
    Contributor

    This is a subset of #16330

  2. added a commit that references this issue on May 11, 2026
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