Text + variable in qDebug -

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i want combine text , variable in qdebug:

qstring city_name = "london"; qdebug() << qstring("you choose city:").arg(city_name);

it doesn't work , don't know why. error is:

qstring::arg: argument missing: choose city:, ?????

add %1:

qstring city_name = "london"; qdebug() << qstring("you choose city: %1").arg(city_name);

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