--- a/langtools/make/tools/crules/MutableFieldsAnalyzer.java	Wed Dec 14 20:23:26 2016 +0000
+++ b/langtools/make/tools/crules/MutableFieldsAnalyzer.java	Fri Dec 16 05:47:58 2016 +0000
@@ -107,6 +107,8 @@
                 "layerClass", "bootMethod", "defineModulesWithOneLoaderMethod", "configurationMethod");
         ignoreFields("com.sun.tools.javac.util.JDK9Wrappers$Module",
                 "addExportsMethod", "addUsesMethod", "getModuleMethod", "getUnnamedModuleMethod");
+        ignoreFields("com.sun.tools.javac.util.JDK9Wrappers$ModuleDescriptor$Version",
+                "versionClass", "parseMethod");
         ignoreFields("com.sun.tools.javac.util.JDK9Wrappers$ServiceLoaderHelper",
                 "loadMethod");
         ignoreFields("com.sun.tools.javac.util.JDK9Wrappers$VMHelper",