From f415f2dc3c1830dfa89175754e86a008698d9dfc Mon Sep 17 00:00:00 2001
From: Roman Shevchenko <roman.shevchenko@jetbrains.com>
Date: Fri, 21 Apr 2017 19:10:03 +0200
Subject: [PATCH] [java] diagnostics (EA-96056)

---
 .../com/intellij/psi/impl/source/PsiMethodImpl.java   | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/java/java-psi-impl/src/com/intellij/psi/impl/source/PsiMethodImpl.java b/java/java-psi-impl/src/com/intellij/psi/impl/source/PsiMethodImpl.java
index d91f1aec0cb8..0cafd1e73591 100644
--- a/java/java-psi-impl/src/com/intellij/psi/impl/source/PsiMethodImpl.java
+++ b/java/java-psi-impl/src/com/intellij/psi/impl/source/PsiMethodImpl.java
@@ -46,6 +46,8 @@ import org.jetbrains.annotations.NotNull;
 import javax.swing.*;
 import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 public class PsiMethodImpl extends JavaStubPsiElement<PsiMethodStub> implements PsiMethod, Queryable {
   private SoftReference<PsiType> myCachedType;
@@ -224,7 +226,14 @@ public class PsiMethodImpl extends JavaStubPsiElement<PsiMethodStub> implements
   @Override
   @NotNull
   public PsiReferenceList getThrowsList() {
-    return getRequiredStubOrPsiChild(JavaStubElementTypes.THROWS_LIST);
+    PsiReferenceList child = getStubOrPsiChild(JavaStubElementTypes.THROWS_LIST);
+    if (child != null) return child;
+
+    PsiMethodStub stub = getStub();
+    Stream<String> children =
+      stub != null ? stub.getChildrenStubs().stream().map(s -> s.getClass().getSimpleName() + " : " + s.getStubType())
+                   : Stream.of(getChildren()).map(e -> e.getClass().getSimpleName() + " : " + e.getNode().getElementType());
+    throw new AssertionError("Missing throws list, file=" + getContainingFile() + " children:\n" + children.collect(Collectors.joining("\n")));
   }
 
   @Override