[Foundation] Extracting the ReferenceConvertible conformance for CharacterSet (#5054)

Author: moiseev

stdlib/public/SDK/Foundation/CharacterSet.swift

@@ -74,7 +74,7 @@ internal final class _SwiftNSCharacterSet : _SwiftNativeNSCharacterSet, _SwiftNa
 */
 public struct CharacterSet : ReferenceConvertible, Equatable, Hashable, SetAlgebra, _MutablePairBoxing {
     public typealias ReferenceType = NSCharacterSet
-    
+
     internal typealias SwiftNSWrapping = _SwiftNSCharacterSet
     internal typealias ImmutableType = SwiftNSWrapping.ImmutableType
     internal typealias MutableType = SwiftNSWrapping.MutableType
@@ -134,19 +134,11 @@ public struct CharacterSet : ReferenceConvertible, Equatable, Hashable, SetAlgeb
             return nil
         }
     }
-    
+
     public var hashValue: Int {
         return _mapUnmanaged { $0.hashValue }
     }
 
-    public var description: String {
-        return _mapUnmanaged { $0.description }
-    }
-    
-    public var debugDescription: String {
-        return _mapUnmanaged { $0.debugDescription }
-    }
-    
     private init(reference: NSCharacterSet) {
         _wrapped = _SwiftNSCharacterSet(immutableObject: reference)
     }
@@ -469,6 +461,16 @@ extension CharacterSet : _ObjectiveCBridgeable {
 
 }
 
+extension CharacterSet : CustomStringConvertible, CustomDebugStringConvertible {
+    public var description: String {
+        return _mapUnmanaged { $0.description }
+    }
+
+    public var debugDescription: String {
+        return _mapUnmanaged { $0.debugDescription }
+    }
+}
+
 extension NSCharacterSet : _HasCustomAnyHashableRepresentation {
     // Must be @nonobjc to avoid infinite recursion during bridging.
     @nonobjc