Simple Logger class in Swift 4.x

Log.swift

import Foundation

/// Represents the Log facilities
struct Log {
    /// Prints in debug only
    static func debug(_ msg: String, line: Int = #line, fileName: String = #file, funcName: String = #function) {
        #if DEBUG
        let fname = (fileName as NSString).lastPathComponent
        print("[\(fname) \(funcName):\(line)]", msg)
        #endif
    }
    
    /// Prints an error message in debug only
    static func error(_ msg: String, line: Int = #line, fileName: String = #file, funcName: String = #function) {
        debug("ERROR: \(msg)!!", line: line, fileName: fileName, funcName: funcName)
    }
    
    /// Prints the debug mark for the line
    static func mark(line: Int = #line, fileName: String = #file, funcName: String = #function) {
        debug("called", line: line, fileName: fileName, funcName: funcName)
    }
}