Currently, if an event source callback returns an error, we'll disable the event source and continue. This adds a per-event source flag that if turned on goes further: the event loop is also exited, propagating the error code. This is inspired by some patterns repeatedly seen in #15206. The idea is that event sources that server the "primary" function of a program are marked like this, so that if they fail the failure is instantly propagated and terminates the program.
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