From 5c745facf4cb3167c45bc4e5ab23647e881e3612 Mon Sep 17 00:00:00 2001
From: Simon Ogorodnik <simon.ogorodnik@jetbrains.com>
Date: Mon, 27 Jul 2020 14:36:26 +0300
Subject: [PATCH] J2K: Improve error message in case of incorrect detach

---
 nj2k/src/org/jetbrains/kotlin/nj2k/tree/base.kt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/nj2k/src/org/jetbrains/kotlin/nj2k/tree/base.kt b/nj2k/src/org/jetbrains/kotlin/nj2k/tree/base.kt
index b213c069def..9c68d026f95 100644
--- a/nj2k/src/org/jetbrains/kotlin/nj2k/tree/base.kt
+++ b/nj2k/src/org/jetbrains/kotlin/nj2k/tree/base.kt
@@ -56,7 +56,9 @@ abstract class JKTreeElement : JKElement, JKFormattingOwner, Cloneable {
 
     override fun detach(from: JKElement) {
         val prevParent = parent
-        require(from == prevParent)
+        require(from == prevParent) {
+            "Incorrect detach: From: $from, Actual: $prevParent"
+        }
         parent = null
     }