allow namespace-qualified references; generate nested namespaces

idea/src/org/jetbrains/jet/codegen/ExpressionCodegen.java

@@ -615,7 +615,7 @@ public class ExpressionCodegen extends JetVisitor {
                     myStack.push(iValue);
                 }
             }
-            else {
+            else if (!(descriptor instanceof NamespaceDescriptor)) {
                 throw new UnsupportedOperationException("don't know how to generate reference " + descriptor);
             }
         }

idea/src/org/jetbrains/jet/codegen/NamespaceCodegen.java

@@ -38,9 +38,8 @@ public class NamespaceCodegen {
     }
 
     public void generate(JetNamespace namespace) {
-        BindingContext bindingContext1 = AnalyzingUtils.analyzeNamespace(namespace, JetControlFlowDataTraceFactory.EMPTY);
-        AnalyzingUtils.applyHandler(ErrorHandler.THROW_EXCEPTION, bindingContext1);
-        BindingContext bindingContext = bindingContext1;
+        BindingContext bindingContext = AnalyzingUtils.analyzeNamespace(namespace, JetControlFlowDataTraceFactory.EMPTY);
+        AnalyzingUtils.applyHandler(ErrorHandler.THROW_EXCEPTION, bindingContext);
 
         final JetStandardLibrary standardLibrary = JetStandardLibrary.getJetStandardLibrary(project);
         final FunctionCodegen functionCodegen = new FunctionCodegen(namespace, v, standardLibrary, bindingContext);
@@ -65,6 +64,10 @@ public class NamespaceCodegen {
             else if (declaration instanceof JetClassOrObject) {
                 classCodegen.generate((JetClassOrObject) declaration);
             }
+            else if (declaration instanceof JetNamespace) {
+                JetNamespace childNamespace = (JetNamespace) declaration;
+                codegens.forNamespace(childNamespace).generate(childNamespace);
+            }
         }
     }
 

idea/testData/codegen/namespaceQualifiedMethod.jet

@@ -0,0 +1,7 @@
+namespace Foo {
+  fun bar() = 610
+}
+
+fun box(): String {
+  return if (Foo.bar() == 610) "OK" else "fail"
+}

idea/tests/org/jetbrains/jet/codegen/NamespaceGenTest.java

@@ -400,4 +400,8 @@ public class NamespaceGenTest extends CodegenTestCase {
         final StringBuilder sb = new StringBuilder("x");
         assertEquals('x', ((Character) main.invoke(null, sb)).charValue());
     }
+
+    public void testNamespaceQualifiedMethod() throws Exception {
+        blackBoxFile("namespaceQualifiedMethod.jet");
+    }
 }