def variableRefs(self, progs=[], varRefSet=None): # no subclass calls this
        try:
            return super(ModelMessage, self).variableRefs(self.expressionProgs, varRefSet)
        except __HOLE__:
            return set()    # no expressions
dataset/ETHPy150Open Arelle/Arelle/arelle/ModelFormulaObject.py/ModelMessage.variableRefs