--- old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/parser/Parser.java	2016-11-04 21:48:09.000000000 +0100
+++ new/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/parser/Parser.java	2016-11-04 21:48:09.000000000 +0100
@@ -1962,6 +1962,18 @@
             switch (type) {
             case SEMICOLON:
                 // for (init; test; modify)
+                if (varDeclList != null) {
+                    assert init == null;
+                    init = varDeclList.init;
+                    // late check for missing assignment, now we know it's a for (init; test; modify) loop
+                    if (varDeclList.missingAssignment != null) {
+                        if (varDeclList.missingAssignment instanceof IdentNode) {
+                            throw error(AbstractParser.message("missing.const.assignment", ((IdentNode)varDeclList.missingAssignment).getName()));
+                        } else {
+                            throw error(AbstractParser.message("missing.destructuring.assignment"), varDeclList.missingAssignment.getToken());
+                        }
+                    }
+                }
 
                 // for each (init; test; modify) is invalid
                 if ((flags & ForNode.IS_FOR_EACH) != 0) {