Previously source_query_graph() was returning &mut SourceFederatedQueryGraphs, though we'd prefer to give back &mut SourceFederatedQueryGraph instead (i.e. hiding other source-kind query graph data, since it turns out we can't really use super to hide them in SourceFederatedQueryGraphs without eliciting warnings).
Previously
source_query_graph()was returning&mut SourceFederatedQueryGraphs, though we'd prefer to give back&mut SourceFederatedQueryGraphinstead (i.e. hiding other source-kind query graph data, since it turns out we can't really usesuperto hide them inSourceFederatedQueryGraphswithout eliciting warnings).