Swift 2.3 Swift 3.0 Xcode 8.3

Swift 3.0 XCode 8.3

From XCode8.3, Swift 2.3(legacy) is not allowed to use. 😡
Not only for application, but also including embedded framework

XCode 8.3 XCode 8.2
Swift 3.0 Code
Swift 2.3 Compile Error
Swift 2.3 Embedded Framework Build Error
Swift 2.3 Static Framework ?
Objective-C
Objective-C static library

To compile Swift 2.3 codes

Unfortunately, the only way to compile 2.3 code together is to downgrade XCode.