Swift does not allow a type to be extended with a LiteralConvertible protocol

Originator:larcus94
Number:rdar://21426865 Date Originated:6-17
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode Version 7.0 beta (7A120f)
Classification:Serious Bug Reproducible:Always
 
Summary:
Swift makes it impossible to extend any type with a LiteralConvertible protocol like IntegerLiteralConvertible. The problem is that the protocol needs a required initializer, which is not allowed in an extension.

Steps to Reproduce:
1. Extend UIColor with the IntegerLiteralConvertible protocol
2. Implement the initializer
3. Try compile it

Expected Results:
It compiles and integers can be used in place of UIColor instances.

Actual Results:
The project does not compile.

Version:
Xcode Version 7.0 beta (7A120f)
OSX Yosemite Version 10.10.3 (14D136)

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