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Summary:
Module 'PlaygroundLogger' contains an extension to the 'Mirror.DisplayStyle' enumeration, to conform to 'CustomStringConvertible', in so including a '.description' for each case in the 'DisplayStyle' enumeration. These descriptions are deprecated and use legacy names (from Swift 1.2 'MirrorDisposition' enumeration) for cases 'Collection', 'Dictionary' and 'Set': names 'IndexContainer', 'KeyContainer' and 'MembershipContainer', respectively. Appropriate descriptors for these cases would simply be 'Collection', 'Dictionary' and 'Set', respectively.

Steps to Reproduce:
1. Start a Swift Playground instance with Swift 2.2/Xcode 7.3 and set platform to iOS or OS X.

2. Paste the following code into the Playground code window (2a. imports the 'PlaygroundLogger' module and 2b. prints the 'CustomStringConvertible' descriptors for each case of 'Mirror.DisplayStyle' enumeration):

// -------------------------------------------- //
import PlaygroundLogger

print(Mirror.DisplayStyle.Class)       // Class
print(Mirror.DisplayStyle.Collection)  // IndexContainer      <---
print(Mirror.DisplayStyle.Dictionary)  // KeyContainer        <---
print(Mirror.DisplayStyle.Enum)        // Enum
print(Mirror.DisplayStyle.Optional)    // Optional
print(Mirror.DisplayStyle.Set)         // MembershipContainer <---
print(Mirror.DisplayStyle.Struct)      // Struct
print(Mirror.DisplayStyle.Tuple)       // Tuple

Mirror.DisplayStyle.Class.description       // Class
Mirror.DisplayStyle.Collection.description  // IndexContainer      <---
Mirror.DisplayStyle.Dictionary.description  // KeyContainer        <---
Mirror.DisplayStyle.Enum.description        // Enum
Mirror.DisplayStyle.Optional.description    // Optional
Mirror.DisplayStyle.Set.description         // MembershipContainer <---
Mirror.DisplayStyle.Struct.description      // Struct
Mirror.DisplayStyle.Tuple.description       // Tuple

// -------------------------------------------- //

Expected Results:
The expected results for printing the cases 'Collection', 'Dictionary' and 'Set' are 'Collection', 'Dictionary' and 'Set', respectively.

Actual Results:
The actual result for printing the cases 'Collection', 'Dictionary' and 'Set' are the corresponding legacy case names 'IndexContainer', 'KeyContainer' and 'MembershipContainer', respectively.

Version:
Swift 2.2/Xcode 7.3 Playground run in OS X 10.11, for platform iOS as well as OS X.

Notes:
For additional details, see the the following StackOverflow thread:
http://stackoverflow.com/questions/36413648/

Configuration:
Always occurs in Playground, as long as the 'PlaygroundLogger' modules has been imported (which is expected, as this module contains the extension to 'Mirror.DisplayStyle' to conformance to  'CustomStringConvertible' protocol).

Attachments: