v0.31.0

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Full Changelog: python-trio/trio@v0.30.0...v0.31.0

Features

• Cancelled strings can now display the source and reason for a cancellation. Trio-internal sources of cancellation will set this string, and CancelScope.cancel now has a reason string parameter that can be used to attach info to any Cancelled to help in debugging. (#​3232)

Bugfixes

• Make ctrl+c work in more situations in the Trio REPL (python -m trio). (#​3007)
• Allow pickling trio.Cancelled, as they can show up when you want to pickle something else. This does not rule out pickling other NoPublicConstructor objects -- create an issue if necessary. (#​3248)
• Decrease import time on Windows by around 10%. (#​3263)
• Handle unwrapping SystemExit/KeyboardInterrupt exception gracefully in utility function raise_single_exception_from_group that reraises last exception from group. (#​3275)
• Ensure that the DTLS server does not mutate SSL context. (#​3277)
• Avoid having trio.as_safe_channel raise if closing the generator wrapped
  GeneratorExit in a BaseExceptionGroup. (#​3324)

Deprecations and removals

• Implement bool(trio.Event) and have it raise a DeprecationWarning and tell users to use trio.Event.is_set instead. This is an alternative to mypy --enable-error-code=truthy-bool for users who don't use type checking. (#​3322)

Miscellaneous internal changes

• When misnesting nurseries you now get a helpful RuntimeError instead of a catastrophic TrioInternalError. (#​3307)