Fixing a few issues

Author: ahejlsberg

src/compiler/checker.ts

@@ -9684,7 +9684,7 @@ module ts {
                             }
                         }
                     }
-                    else if (node.kind !== SyntaxKind.ExportAssignment && node.flags & NodeFlags.Export) {
+                    else if (node.kind !== SyntaxKind.ExportAssignment && node.flags & NodeFlags.Export && !(node.flags & NodeFlags.Default)) {
                         return true;
                     }
                 }

src/compiler/types.ts

@@ -501,7 +501,7 @@ module ts {
     }
 
     export interface FunctionDeclaration extends FunctionLikeDeclaration, Statement {
-        name: Identifier;
+        name?: Identifier;
         body?: Block;
     }
 
@@ -825,7 +825,7 @@ module ts {
     }
 
     export interface ClassDeclaration extends Declaration, ModuleElement {
-        name: Identifier;
+        name?: Identifier;
         typeParameters?: NodeArray<TypeParameterDeclaration>;
         heritageClauses?: NodeArray<HeritageClause>;
         members: NodeArray<ClassElement>;

src/services/navigationBar.ts

@@ -415,6 +415,11 @@ module ts.NavigationBar {
             }
 
             function createClassItem(node: ClassDeclaration): ts.NavigationBarItem {
+                if (!node.name) {
+                    // An export default class may be nameless
+                    return undefined;
+                }
+
                 var childItems: NavigationBarItem[];
 
                 if (node.members) {