QCoro::waitFor does not rethrow exceptions

[cvuchener]

Using a9c69b9

#include <QCoreApplication>
#include <QCoroTask>

int main(int argc, char *argv[])
{
	QCoreApplication app(argc, argv);

	auto task = []() -> QCoro::Task<> { 
		throw std::runtime_error("error");
		co_return;
	}();
	try {
		QCoro::waitFor(task);
		qInfo() << "Everything is fine";
	}
	catch (std::exception &e) {
		qInfo() << "Something went wrong:" << e.what();
	}
	return 0;
}

When the exception is thrown, QCoro::waitFor blocks forever instead of rethrowing the exception.