From 5acaee8c8200598384b83608440f06b19b46c0cb Mon Sep 17 00:00:00 2001
From: Jamie Thompson <bishbashboshjt@gmail.com>
Date: Thu, 6 Nov 2025 18:15:31 +0100
Subject: [PATCH] Reintroduce reflective REPL pprint call.

The class name changed, but the reflective call is still necessary for deeply nested objects to be formatted correctly.
---
 repl/src/dotty/tools/repl/Rendering.scala | 29 ++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/repl/src/dotty/tools/repl/Rendering.scala b/repl/src/dotty/tools/repl/Rendering.scala
index 3f62654fafae..693347103481 100644
--- a/repl/src/dotty/tools/repl/Rendering.scala
+++ b/repl/src/dotty/tools/repl/Rendering.scala
@@ -27,9 +27,32 @@ private[repl] class Rendering(parentClassLoader: Option[ClassLoader] = None):
   var myClassLoader: AbstractFileClassLoader = uninitialized
 
   private def pprintRender(value: Any, width: Int, height: Int, initialOffset: Int)(using Context): String = {
-    pprint.PPrinter.BlackWhite
-      .apply(value, width = width, height = height, initialOffset = initialOffset)
-      .plainText
+    def fallback() =
+      pprint.PPrinter.BlackWhite
+        .apply(value, width = width, height = height, initialOffset = initialOffset)
+        .plainText
+    try
+      val cl = classLoader()
+      val pprintCls = Class.forName("pprint.PPrinter$BlackWhite$", false, cl)
+      val fansiStrCls = Class.forName("fansi.Str", false, cl)
+      val BlackWhite = pprintCls.getField("MODULE$").get(null)
+      val BlackWhite_apply = pprintCls.getMethod("apply",
+        classOf[Any],     // value
+        classOf[Int],     // width
+        classOf[Int],     // height
+        classOf[Int],     // indentation
+        classOf[Int],     // initialOffset
+        classOf[Boolean], // escape Unicode
+        classOf[Boolean], // show field names
+      )
+      val FansiStr_plainText = fansiStrCls.getMethod("plainText")
+      val fansiStr = BlackWhite_apply.invoke(
+        BlackWhite, value, width, height, 2, initialOffset, false, true
+      )
+      FansiStr_plainText.invoke(fansiStr).asInstanceOf[String]
+    catch
+      case ex: ClassNotFoundException => fallback()
+      case ex: NoSuchMethodException  => fallback()
   }