py3: suppress unraisable exceptions in test-worker.t Python 3.8 calls sys.unraisablehook when an unraisable exception is encountered. The default behavior is to print a warning. test-worker.t was triggering this hook due to a race between a newly forked process exiting and that process's _os.register_at_fork handlers running. I was seeing the stdlib's random module in the stack re-seeding itself. Although there could be other after-fork handlers in the mix. This commit defines sys.unraisablehook to effectively no-op. This suppresses the warning and makes test output on Python 3.8 consistent with prior versions. test-worker.t now passes on Python 3.8. Differential Revision: https://phab.mercurial-scm.org/D7949

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{

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    // Enforcing

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    "eqeqeq"        : true,     // true: Require triple equals (===) for comparison

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    "forin"         : true,     // true: Require filtering for..in loops with obj.hasOwnProperty()

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    "freeze"        : true,     // true: prohibits overwriting prototypes of native objects such as Array, Date etc.

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    "nonbsp"        : true,     // true: Prohibit "non-breaking whitespace" characters.

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    "undef"         : true,     // true: Require all non-global variables to be declared (prevents global leaks)

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    // Environments

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    "browser"       : true      // Web Browser (window, document, etc)

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}