From e251051bf1359dfbf45bf393da1ace712332aa86 Mon Sep 17 00:00:00 2001
From: peter <peter@jetbrains.com>
Date: Tue, 9 Feb 2016 20:40:16 +0100
Subject: [PATCH] a comprehensible message when
 FileStatusMap.assertAllowModifications fails

---
 .../src/com/intellij/codeInsight/daemon/impl/FileStatusMap.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/platform/analysis-impl/src/com/intellij/codeInsight/daemon/impl/FileStatusMap.java b/platform/analysis-impl/src/com/intellij/codeInsight/daemon/impl/FileStatusMap.java
index 7acc45ecbdf3..439bef719247 100644
--- a/platform/analysis-impl/src/com/intellij/codeInsight/daemon/impl/FileStatusMap.java
+++ b/platform/analysis-impl/src/com/intellij/codeInsight/daemon/impl/FileStatusMap.java
@@ -176,7 +176,7 @@ public class FileStatusMap implements Disposable {
 
   private void assertAllowModifications() {
     try {
-      assert myAllowDirt;
+      assert myAllowDirt : "PSI/document/model changes are not allowed during highlighting";
     }
     finally {
       myAllowDirt = true; //give next test a chance