Skipping test in beforeTestAsync /sometimes/ leads to a non-zero exit

[fredemmott]

Run vendor/bin/hacktest tests/*.hack
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  vendor/bin/hacktest tests/*.hack
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  shell: /bin/bash -e {0}
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......
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Summary: 6 test(s), 6 passed, 0 failed, 0 skipped, 0 error(s).
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Fatal error: Uncaught exception 'Facebook\HackTest\SkippedTestException' with message 'Fallback handler is not enabled' in /home/runner/work/hhvm-autoload/hhvm-autoload/vendor/hhvm/hacktest/src/Framework/HackTest.hack:266
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Stack trace:
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#0 /home/runner/work/hhvm-autoload/hhvm-autoload/tests/FallbackHandlerTest.hack(20): Facebook\HackTest\HackTest::markTestSkipped()
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#1 /home/runner/work/hhvm-autoload/hhvm-autoload/vendor/hhvm/hacktest/src/Framework/HackTest.hack(156): Facebook\AutoloadMap\FallbackHandlerTest->beforeEachTestAsync()
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#2 /home/runner/work/hhvm-autoload/hhvm-autoload/vendor/hhvm/hacktest/src/Runner/HackTestRunner.hack(78): Facebook\HackTest\HackTest->runTestsAsync()
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#3 /home/runner/work/hhvm-autoload/hhvm-autoload/vendor/hhvm/hacktest/src/HackTestCLI.hack(103): Facebook\HackTest\HackTestRunner::runAsync()
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#4 /home/runner/work/hhvm-autoload/hhvm-autoload/vendor/facebook/hh-clilib/src/CLIBase.hack(181): Facebook\HackTest\HackTestCLI->mainAsync()
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#5 /home/runner/work/hhvm-autoload/hhvm-autoload/vendor/hhvm/hacktest/bin/hacktest.hack(36): Facebook\CLILib\CLIBase::runAsync()
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#6 /home/runner/work/hhvm-autoload/hhvm-autoload/vendor/hhvm/hacktest/bin/hacktest(19): Facebook\HackTest\hack_test_main_async()
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#7 (): Facebook\HackTest\hack_test_main_async_UNSAFE()
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#8 (): Closure$__SystemLib\enter_async_entry_point()
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#9 (): HH\Asio\join()
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#10 (): __SystemLib\enter_async_entry_point()
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#11 {main}

From https://github.com/hhvm/hhvm-autoload/runs/1323201059?check_suite_focus=true

Probably a non-awaited awaitable, given it's being raised after the '0 skipped' was printed