src/vs/editor/contrib/gotoSymbol/browser/referencesModel.ts/ReferencesModel/referenceAt
class ReferencesModel:	referenceAt(resource: URI, position: Position): OneReference | undefined {
		for (const ref of this.references) {
			if (ref.uri.toString() === resource.toString()) {
				if (Range.containsPosition(ref.range, position)) {
					return ref;
				}
			}
		}
		return undefined;
	}