Open Radar

 
Summary:
Mac OS X 10.10.3 includes new diversity emoji.  These emoji are encoded as two Unicode code points: a base emoji and a modifier codepoint that changes the skin color of the base emoji.  The resulting emoji has a single grapheme representation — they appear as one indivisible character to user.  However, Swift 1.2 considers these new emoji to be two characters instead of a single character in size.  This is inconsistent with how Swift counts other Unicode modifier codepoints.

Steps to Reproduce:
1. Use Xcode 6.3 to create a Swift playground for OS X.
2. Enter the following Swift code.  es1 is a traditional emoji, and es2 is a diversity emoji.

let es1 = "👌"
count(es1)
let ec1 = Character(es1)
let es2 = "👌🏽"
count(es2)
let ec2 = Character(es2)



Expected Results:
* The output of both calls to count() should be 1.
* The output of both Character() constructors should be valid.

Actual Results:
* count(es1) = 1, but count(es2) = 2
* Character(es2) fails to execute (the playground stops showing output)

Version:
Xcode 6.3 (6D570)
OS X 10.10.3 (14D131)