Xcode 7.3: import Module displayed with strikethro

Question

After upgrading Xcode to 7.3, I just found that some modules are stricken out while importing, like in this screenshot:

But after adding the module (so just pressing enter) everything is fine. What does that mean? The module here is written in Swift and works fine.

Answer 1

I changed the order of the imports

import Foundation
import UIKit
import LayerKit
import Atlas  < red line


import Foundation
import UIKit
import Atlas
import LayerKit

Some notes that may be causing it:

• LayerKit importing Atlas even though LayerKit is the lower level API Atlas is the UI layer

• Both were Cocoapod imports

• Error appeared when I created an 2nd Schema for App Store/Enteprise releases and cleaned one and switch to the other.

• Deleting Derived Data didnt clear it.
• So tried rearranging them and red line disappeared

Answer 2

The strikethrough occurs if you try to import a module that has already been imported by your file or module:

In this case, I have already imported Foundation (which implicitly imports CoreFoundation), so Xcode is telling you that there is no need to import either module again.

Answer 3

This is a bug. We have fixed it in 218010af, which should be included in the Swift 2.2.1 release and is included in the 2016-04-12-a developer snapshot.