--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/ClassReader.java	Mon Dec 04 10:13:58 2017 +0100
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/ClassReader.java	Mon Dec 04 17:54:49 2017 +0000
@@ -42,6 +42,7 @@
 import javax.tools.JavaFileManager;
 import javax.tools.JavaFileObject;
 
+import com.sun.tools.javac.code.Source.Feature;
 import com.sun.tools.javac.comp.Annotate;
 import com.sun.tools.javac.comp.Annotate.AnnotationTypeCompleter;
 import com.sun.tools.javac.code.*;
@@ -246,8 +247,8 @@
         verbose         = options.isSet(Option.VERBOSE);
 
         Source source = Source.instance(context);
-        allowSimplifiedVarargs = source.allowSimplifiedVarargs();
-        allowModules     = source.allowModules();
+        allowSimplifiedVarargs = Feature.SIMPLIFIED_VARARGS.allowedInSource(source);
+        allowModules     = Feature.MODULES.allowedInSource(source);
 
         saveParameterNames = options.isSet(PARAMETERS);