Function derived_relation_resolution 

fn derived_relation_resolution<'a>(
    project: ProjectInstanceId,
    generation: IndexGeneration,
    fact: &DerivedRelationFact,
    owners: &GraphOwners,
    graph: &SymbolGraph,
    symbol_index: &GraphSymbolIndex<'_>,
    candidates: &'a ProjectResolutionRegistry,
    entities: &'a BTreeMap<String, GraphEntity>,
    external_entities: &mut BTreeMap<String, GraphEntity>,
    control: &IndexWorkControl,
) -> Result<RelationResolution, CliError>

Resolve one additive relation through its closed target class.