ErrorHandler can not throw errors because it will unsubscribe itself from the error stream. Zones captures errors and feed it into NgZone, which than has a Rx Observable to feed it into ErrorHandler. If the ErroHandler throws, then Rx will teardown the observable which in essence causes the ErrorHandler to be removed from the error handling. This implies that the ErrorHandler can never throw errors. Closes #14949 Closes #15182 Closes #14316
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