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Summary:
Using Swift 2.3 on Xcode 8, when a unwind segue is created using a Storyboard, Xcode tries to connect it to a matching method in the view controller by appending "WithSegue:" to the method name, which causes a mismatch with the unwind segue and it doesn't work.

Attached is an example project.

Steps to Reproduce:
1 - Create a new project and configure it to use Swift 2.3
2 - In a UIViewController, create a @IBAction method to receive the unwinding segue.
3 - In a storyboard, create an exit segue that links to the method created in step 2 (note that "WithSegue" is appended to the method contract)
4 - Run the app and execute the segue action

Expected Results:
The presented view controller should be dismissed to the target view controller.

Actual Results:
The presented view controller isn't dismissed and nothing happens.

Version:
Xcode 8.0 (8A218a) 

Notes:
A possible workaround is to change the target method name by appending "WithSegue" *after* the segue has been created in the storyboard.

I've attached a new project with an example.

Note that if a new exit segue is created, Xcode tries to link it with a method named "unwindToViewControllerWithSegueWithSegue"

Configuration:
Running on a brand new project on Xcode 8.0 (8A218a) running on a MacBook Pro Retina 13" Late-13 with macOS 10.11.6

Attachments:
'Segues Example.zip' was successfully uploaded.