From 9f9d4dbf3054f3a17a0d4dea13cbe3c8b03994ff Mon Sep 17 00:00:00 2001
From: "peter.gromov" <peter@jetbrains.com>
Date: Thu, 11 Nov 2010 14:41:14 +0300
Subject: [PATCH] diagnostics for non-stub content element in a file (EA-23305)

---
 .../src/com/intellij/psi/impl/source/PsiFileImpl.java       | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/platform/lang-impl/src/com/intellij/psi/impl/source/PsiFileImpl.java b/platform/lang-impl/src/com/intellij/psi/impl/source/PsiFileImpl.java
index 24f835511772..064518fe73f7 100644
--- a/platform/lang-impl/src/com/intellij/psi/impl/source/PsiFileImpl.java
+++ b/platform/lang-impl/src/com/intellij/psi/impl/source/PsiFileImpl.java
@@ -260,8 +260,12 @@ public abstract class PsiFileImpl extends ElementBase implements PsiFileEx, PsiF
 
 
   private void switchFromStubToAST(ASTNode root, final Iterator<StubElement<?>> stubs) {
+    final IElementType contentElementType = getContentElementType();
+    if (!(contentElementType instanceof IStubFileElementType)) {
+      throw new AssertionError("Invalid content element type: " + contentElementType + "; elementType=" + myElementType + "; file=" + getClass() + "; viewProvider=" + getViewProvider());
+    }
     ((TreeElement)root).acceptTree(new RecursiveTreeElementWalkingVisitor() {
-      final StubBuilder builder = ((IStubFileElementType)getContentElementType()).getBuilder();
+      final StubBuilder builder = ((IStubFileElementType)contentElementType).getBuilder();
 
       @Override
       protected void visitNode(TreeElement tree) {