Instances of ChainedScope should always have a debugMessage

compiler/frontend/src/org/jetbrains/jet/lang/resolve/TypeHierarchyResolver.java

@@ -460,7 +460,7 @@ public class TypeHierarchyResolver {
             context.getPackageFragments().put(file, packageFragment);
 
             PackageViewDescriptor packageView = packageFragment.getContainingDeclaration().getPackage(packageFragment.getFqName());
-            ChainedScope rootPlusPackageScope = new ChainedScope(packageView, packageView.getMemberScope(), outerScope);
+            ChainedScope rootPlusPackageScope = new ChainedScope(packageView, "Root scope for " + file, packageView.getMemberScope(), outerScope);
             WriteThroughScope packageScope = new WriteThroughScope(rootPlusPackageScope, packageFragment.getMemberScope(),
                                                                      new TraceBasedRedeclarationHandler(trace), "package in file " + file.getName());
             packageScope.changeLockLevel(WritableScope.LockLevel.BOTH);

compiler/frontend/src/org/jetbrains/jet/lang/resolve/calls/CallExpressionResolver.java

@@ -178,7 +178,9 @@ public class CallExpressionResolver {
             scopes.add(namespace.getMemberScope());
         }
 
-        JetScope scope = new ChainedScope(classifier, scopes.toArray(new JetScope[scopes.size()]));
+        JetScope scope = new ChainedScope(
+                classifier, "Member scope for extended class object type " + classifier, scopes.toArray(new JetScope[scopes.size()])
+        );
         return new NamespaceType(referencedName, scope, new ExpressionReceiver(expression, classObjectType));
     }
 
@@ -213,7 +215,9 @@ public class CallExpressionResolver {
         JetScope scope;
         ClassifierDescriptor classifier = context.scope.getClassifier(name);
         if (classifier instanceof ClassDescriptor) {
-            scope = new ChainedScope(namespace, namespace.getMemberScope(), getStaticNestedClassesScope((ClassDescriptor) classifier));
+            scope = new ChainedScope(
+                    namespace, "Namespace type member scope for " + expression.getText(), namespace.getMemberScope(), getStaticNestedClassesScope((ClassDescriptor) classifier)
+            );
         }
         else {
             scope = namespace.getMemberScope();

compiler/tests/org/jetbrains/jet/types/TypeSubstitutorTest.java

@@ -93,6 +93,7 @@ public class TypeSubstitutorTest extends KotlinTestWithEnvironment {
         }
         typeParameters.changeLockLevel(WritableScope.LockLevel.READING);
         return new ChainedScope(module,
+                                "TypeSubstitutorTest::getContextScope()",
                                 topLevelDeclarations,
                                 typeParameters,
                                 contextClass.getDefaultType().getMemberScope(),