Minor fix to testing concurrency section
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@ -589,11 +589,11 @@ please see the [Documentation chapter](documentation.html).
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# Testing and concurrency
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One thing that is important to note when writing tests are run concurrently
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using threads. For this reason you should take care that your tests are written
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in such a way as to not depend on each-other, or on any shared state. "Shared
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state" can also include the environment, such as the current working directory,
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or environment variables.
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One thing that is important to note when writing tests is that they may be run
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concurrently using threads. For this reason you should take care that your tests
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are written in such a way as to not depend on each-other, or on any shared
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state. "Shared state" can also include the environment, such as the current
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working directory, or environment variables.
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If this is an issue it is possible to control this concurrency, either by
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setting the environment variable `RUST_TEST_THREADS`, or by passing the argument
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