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public extension Optional {

    /// Stop in the debugger in debug builds if self is `.none`.
    ///
    /// Example usage:
    ///
    ///   guard let value = maybeValue.assertUnwrap() else { return "bogus value" }
    ///
    func assertUnwrap(_ message: @autoclosure () -> String? = nil, file: StaticString = #file, function: String = #function, line: UInt = #line) -> Wrapped? {
        switch self {

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# Full path: /home/pi/.config/lxsession/LXDE-pi/autostart
@lxpanel --profile LXDE-pi
@pcmanfm --desktop --profile LXDE-pi
@xset s off
@xset -dpms
@xset s noblank
@/home/pi/jmri-runner.sh

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Was getting the following errors when calling AVAssetImageGenerator generateCGImagesAsynchronously. The stream in question was an HLS stream. When I switched to using the AVURLAsset of an MP4, the error disappeared.

With Apple-supplied HLS stream:

Error Domain=AVFoundationErrorDomain Code=-11819 "Cannot Complete Action" UserInfo={NSLocalizedRecoverySuggestion=Try again later., NSLocalizedDescription=Cannot Complete Action, NSUnderlyingError=0x1c0057850 {Error Domain=NSOSStatusErrorDomain Code=-12178 "(null)"}}

With another HLS stream generated by a video hosting provider:

Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo={NSLocalizedFailureReason=An unknown error occurred (-12436), NSLocalizedDescription=The operation could not be completed, NSUnderlyingError=0x1c4a57e20 {Error Domain=NSOSStatusErrorDomain Code=-12436 "(null)"}}

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protocol Protocol {
    func methodInProtocol() -> String
}

extension Protocol {
    func methodInProtocol() -> String {
        return "Protocol"
    }
    func methodOnExtension() -> String {

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protocol Mutatable {}

extension Mutatable {
    func mutated(f: (inout Self) -> Void) -> Self {
        var copy = self
        f(&copy)
        return copy
    }
}

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import Cocoa

@objc
class SomeTextStorage: NSTextStorage {
    
    private var storage: NSMutableAttributedString
    
    override init() {
        storage = NSMutableAttributedString(string: "", attributes: nil)
        super.init()

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final class Completion<R> {
	
	private let closure: (R) -> Void
	private var cancelled = false

	/// `closure` is called upon completion, if not cancelled.
	init(closure: (R) -> Void) {
		self.closure = closure
	}
	

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/// Convert a Pivotal Tracker story id (#1234, 1234) or URL into a Markdown link using the story number as the link text.
function markdownTrackerLink(text) {
  var regex = /\s*(http.*pivotaltracker\.com\/story\/show\/(\d+)|#?(\d+))\s*/;
  var id;
  var groups;

  if (regex.test(text)) {
    groups = regex.exec(text);
    id = groups[3] || groups[2];
    return "[#"+id+"](https://www.pivotaltracker.com/story/show/"+id+")";

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import Foundation

/// Helper object for more Swift-like KVO. To create, call NSObject.addObserverForKeyPath(_:handler:).
class KeyValueObserver: NSObject {
	
	private weak var observing: NSObject?
	private var keyPath: String
	private var handler: () -> Void
	
	private init(observing: NSObject, keyPath: String, handler: () -> Void) {

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extension ErrorType {
	
	var myLocalizedDescription: String {
		if self.dynamicType == NSError.self {
			return ((self as Any) as! NSError).localizedDescription
		}
		else {
			return "\(self)"
		}
	}