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> What has "signaled exceptions"?

Java.

It's not clear what you're asking.

My comment noted that signalling the possibility of errors to caller (in general) is valuable.

jcelerier objected with java's checked exceptions as a counter-example, as they signal to the caller, but they're shit.

However that's not a counter example, that's just java's checked exceptions being a shitty implementation of the idea.