_BridgedStoredNSError should conform to CustomStringConvertible

swiftlang/swift#24149

Author: colemancda

Foundation/NSError.swift

@@ -498,7 +498,7 @@ public protocol _BridgedNSError : __BridgedNSError, RawRepresentable, _Objective
 
 /// Describes a bridged error that stores the underlying NSError, so
 /// it can be queried.
-public protocol _BridgedStoredNSError : __BridgedNSError, _ObjectiveCBridgeableError, CustomNSError, Hashable {
+public protocol _BridgedStoredNSError : __BridgedNSError, _ObjectiveCBridgeableError, CustomNSError, Hashable, CustomStringConvertible {
     /// The type of an error code.
     associatedtype Code: _ErrorCodeProtocol
 
@@ -516,6 +516,12 @@ public protocol _BridgedStoredNSError : __BridgedNSError, _ObjectiveCBridgeableE
     init(_nsError error: NSError)
 }
 
+public extension _BridgedStoredNSError {
+    var description: String {
+        return _nsError.description
+    }
+}
+
 /// Various helper implementations for _BridgedStoredNSError
 extension _BridgedStoredNSError where Code: RawRepresentable, Code.RawValue: FixedWidthInteger {
     public var code: Code {