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c78c9168d7
In the past, it was not possible to choose to use the multi-threaded tokio `Runtime` in tests, which meant that any test that transitively used `executor::threadpool::blocking` would fail with ``` 'blocking' annotation used from outside the context of a thread pool ``` This patch adds a runtime annotation attribute to `#[tokio::test]` just like `#[tokio::main]` has, which lets users opt in to the threadpool runtime over `current_thread` (the default).
Tests the various combination of feature flags. This is broken out to a separate crate to work around limitations with cargo features.