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The original runtime error reporting PR[^1] added a "cc.exception"
module, which allowed coroutine managers (such as parallel) to throw
rich errors, detailing the original context where the error was thrown.
Unfortunately, the change to parallel broke some programs (>_>, don't do
string pattern matching on your errors!), and so had to be reverted,
along with the cc.exception module.
As a minimal replacement for this, we add support for user-thrown
exceptions within our internal code. If an error object "looks" like an
exception ("exception" __name, and a message and thread field), then we
use that as our error information instead.
This is currently undocumented (at least in user-facing documentation),
mostly because I couldn't figure out where to put it - the interface
should remain stable.
[^1]: https://github.com/cc-tweaked/CC-Tweaked/pull/1320