Finish futures when their promise is broken #187
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Accidentally discarding a
djinni::Promiseleads the associated future(s) to block forever inget. This is unrecoverable when it happens. Instead, I'm applying the behavior ofstd::promise::~promisetodjinni::Promise: if the promise is not finished, we set aBrokenPromiseExceptioninto the shared state.This is (kind of) a breaking change. But it only changes behavior for users, who rely on futures that never complete when the promise is discarded. In my opinion, that was buggy behavior.