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Summary:
When compiling with the iOS 10 SDK, and running on an iOS 10 device, calling MFMailComposeViewController() can return nil when MFMailComposeViewController.canSendMail is false, despite the fact that its initializer is not marked as failable.

Steps to Reproduce:
1. Start with a fresh simulator that has no mail accounts installed.
2. Write an app that initializes a MFMailComposeViewController, like this: MFMailComposeViewController().
3. Notice that the value returned by MFMailComposeViewController() is actually nil and could potentially cause a crash.

Expected Results:
There are two expected results:
a. MFMailComposeViewController() would never return nil (this was the behavior on iOS 9), or
b. MFMailComposeViewController() would be marked as failable, so Swift consumers would have to handle the optionality of the return value.

Actual Results:
MFMailComposeViewController() returns nil, despite not being marked as a failable initializer.

Version:
Xcode Version 8.0 beta 6 (8S201h)

Notes:


Configuration:
iPhone SE Simulator

Attachments:
'MFMailComposeViewControllerBug.zip' was successfully uploaded.