Fail to parse if saveUserDefaults is not commented out

IncidentList.swift

class IncidentList: NSObject, NSCoding {
    var incidents: [Incident]
    static let sharedInstance = IncidentList()
    var stagedIncident: Incident?
    let ArchiveURL = DocumentsDirectory.appendingPathComponent("incidents").standardizedFileURL.path

//    private override init() {
//    }
    
    public override init() {
        incidents = []
        super.init()
    }
    
    func encode(with aCoder: NSCoder) {
        aCoder.encode(incidents, forKey: PropertyKey.incidentsKey)
    }
    
    public required init?(coder aDecoder: NSCoder) {
        incidents = (aDecoder.decodeObject(forKey: PropertyKey.incidentsKey) as! [Incident])
    }
    
    class func saveUserDefaults() {
        let result = NSKeyedArchiver.archiveRootObject(incidents, toFile: IncidentList.sharedInstance.ArchiveURL)
        if !result {
            print("Failed to save gIncidents...")
        }
    }
1.	While emitting IR SIL function @_TZFC14NoisyNeighbors12IncidentList16saveUserDefaultsfT_T_ for 'saveUserDefaults'