src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/LocalVariableTypesCalculator.java

*** 593,603 ****
          if(!reachable) {
              return false;
          }
  
          final Expression init = forNode.getInit();
!         if(forNode.isForIn()) {
              final JoinPredecessorExpression iterable = forNode.getModify();
              visitExpression(iterable);
              enterTestFirstLoop(forNode, null, init,
                      // If we're iterating over property names, and we can discern from the runtime environment
                      // of the compilation that the object being iterated over must use strings for property
--- 593,603 ----
          if(!reachable) {
              return false;
          }
  
          final Expression init = forNode.getInit();
!         if(forNode.isForIn() || forNode.isForOf()) {
              final JoinPredecessorExpression iterable = forNode.getModify();
              visitExpression(iterable);
              enterTestFirstLoop(forNode, null, init,
                      // If we're iterating over property names, and we can discern from the runtime environment
                      // of the compilation that the object being iterated over must use strings for property