--- old/src/jdk.compiler/share/classes/com/sun/tools/javac/model/JavacElements.java	2017-02-13 10:09:00.648299596 -0800
+++ new/src/jdk.compiler/share/classes/com/sun/tools/javac/model/JavacElements.java	2017-02-13 10:09:00.532299601 -0800
@@ -25,6 +25,7 @@
 
 package com.sun.tools.javac.model;
 
+import java.util.Collections;
 import java.util.HashSet;
 import java.util.LinkedHashSet;
 import java.util.Map;
@@ -117,6 +118,14 @@
     }
 
     @Override @DefinedBy(Api.LANGUAGE_MODEL)
+    public Set<? extends ModuleElement> getAllModuleElements() {
+        if (allowModules)
+            return Collections.unmodifiableSet(modules.allModules());
+        else
+            return Collections.emptySet();
+    }
+
+    @Override @DefinedBy(Api.LANGUAGE_MODEL)
     public ModuleSymbol getModuleElement(CharSequence name) {
         ensureEntered("getModuleElement");
         if (modules.getDefaultModule() == syms.noModule)