private void CheckOperator(BfsExpGroup group, BfsOperator op)
{
//Just a formality check if the operators in the same group actually do belong to the same operator precedence-group
if (group.OperatorPrecedenceLevel == BfsExpGroupOperatorLevel.Undetermined)
group.OperatorPrecedenceLevel = op.PrecendenceLevel;
else if (group.OperatorPrecedenceLevel != op.PrecendenceLevel)
BfsCompiler.ReportError(op.SourceRange,"Mixed operator-precedence groups! '"
+ op + "' doesn't belong in '"+group.OperatorPrecedenceLevel+"'");
}