Thanks – I really appreciate the definitive answer. 

I’m worried a lot of people don’t realise this when doing their planning for 
the next few months – the migration guide is a little bit ambiguous on this 
front:

“Wait until the upstream open-source project updates to Swift 2.3 or Swift 3”
- https://swift.org/migration-guide/#using-carthagecocoapods-projects

If read optimistically, one could easily think that the update of the upstream 
open-source project doesn’t have to be to the same Swift version as ones own 
project...

- Ted

From: <daniel_dun...@apple.com> on behalf of Daniel Dunbar 
<daniel_dun...@apple.com>
Date: Monday, 27 June 2016 at 16:30
To: Ted Bradley <ted.brad...@hudl.com>
Cc: "swift-users@swift.org" <swift-users@swift.org>
Subject: Re: [swift-users] Can Swift 2.3 frameworks be used with a Swift 3.0 
app?

No, this is not possible. All of the code in a single process needs to be 
compiled with the same version of Swift.

 - Daniel




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