Adopt the underscored variants of PlaygroundQuickLook, CustomPlaygrou…

PlaygroundLogger/PlaygroundLogger/LegacySupport/PlaygroundQuickLook+OpaqueRepresentationSupport.swift

@@ -18,7 +18,7 @@ import Foundation
     import AppKit
 #endif
 
-extension PlaygroundQuickLook {
+extension _PlaygroundQuickLook {
     func opaqueRepresentation() throws -> LogEntry.OpaqueRepresentation {
         // TODO: don't crash in this function; instead, throw an error so we can encode an error log message instead
 

PlaygroundLogger/PlaygroundLogger/LogEntry+Reflection.swift

@@ -93,10 +93,10 @@ extension LogEntry {
         }
 
         // For types which conform to the legacy `CustomPlaygroundQuickLookable` or `_DefaultCustomPlaygroundQuickLookable` protocols, get their `PlaygroundQuickLook` and use that for logging.
-        else if let customQuickLookable = instance as? CustomPlaygroundQuickLookable {
+        else if let customQuickLookable = instance as? _CustomPlaygroundQuickLookable {
             self = try .init(playgroundQuickLook: customQuickLookable.customPlaygroundQuickLook, name: name, typeName: typeName, summary: generateSummary(for: instance, withTypeName: typeName, using: mirror))
         }
-        else if let defaultQuickLookable = instance as? _DefaultCustomPlaygroundQuickLookable {
+        else if let defaultQuickLookable = instance as? __DefaultCustomPlaygroundQuickLookable {
             self = try .init(playgroundQuickLook: defaultQuickLookable._defaultCustomPlaygroundQuickLook, name: name, typeName: typeName, summary: generateSummary(for: instance, withTypeName: typeName, using: mirror))
         }
 
@@ -130,7 +130,7 @@ extension LogEntry {
         }
     }
 
-    private init(playgroundQuickLook: PlaygroundQuickLook, name: String, typeName: String, summary: String) throws {
+    private init(playgroundQuickLook: _PlaygroundQuickLook, name: String, typeName: String, summary: String) throws {
         // TODO: figure out when to set `preferBriefSummary` to true
         self = try .opaque(name: name, typeName: typeName, summary: summary, preferBriefSummary: false, representation: playgroundQuickLook.opaqueRepresentation())
     }

PlaygroundLogger/PlaygroundLoggerTests/LegacyPlaygroundLoggerTests.swift

@@ -640,12 +640,12 @@ class LegacyPlaygroundLoggerTests: XCTestCase {
     }
 
     func testPlaygroundQuickLookCalledOnce() {
-        class MyObject : CustomPlaygroundQuickLookable {
+        class MyObject : _CustomPlaygroundQuickLookable {
             var numCalls = 0
-            var customPlaygroundQuickLook: PlaygroundQuickLook {
+            var customPlaygroundQuickLook: _PlaygroundQuickLook {
                 get {
                     numCalls = numCalls + 1
-                    return PlaygroundQuickLook(reflecting: "Hello world")
+                    return .text("Hello world")
                 }
             }
         }