src/jdk/nashorn/internal/ir/ForNode.java

*** 43,60 ****
      private final JoinPredecessorExpression modify;
  
      /** Iterator symbol. */
      private Symbol iterator;
  
-     /** Is this a normal for loop? */
-     public static final int IS_FOR      = 1 << 0;
- 
      /** Is this a normal for in loop? */
!     public static final int IS_FOR_IN   = 1 << 1;
  
      /** Is this a normal for each in loop? */
!     public static final int IS_FOR_EACH = 1 << 2;
  
      private final int flags;
  
      /**
       * Constructor
--- 43,60 ----
      private final JoinPredecessorExpression modify;
  
      /** Iterator symbol. */
      private Symbol iterator;
  
      /** Is this a normal for in loop? */
!     public static final int IS_FOR_IN           = 1 << 0;
  
      /** Is this a normal for each in loop? */
!     public static final int IS_FOR_EACH         = 1 << 1;
! 
!     /** Does this loop need a per-iteration scope because its init contain a LET declaration? */
!     public static final int PER_ITERATION_SCOPE = 1 << 2;
  
      private final int flags;
  
      /**
       * Constructor
*** 271,276 ****
--- 271,290 ----
  
      @Override
      JoinPredecessor setLocalVariableConversionChanged(final LexicalContext lc, final LocalVariableConversion conversion) {
          return Node.replaceInLexicalContext(lc, this, new ForNode(this, init, test, body, modify, flags, controlFlowEscapes, conversion));
      }
+ 
+     @Override
+     public boolean hasPerIterationScope() {
+         return (flags & PER_ITERATION_SCOPE) != 0;
+     }
+ 
+     /**
+      * Set the per-iteration-scope flag on this node.
+      * @param lc lexical context
+      * @return the node with flag set
+      */
+     public ForNode setPerIterationScope(final LexicalContext lc) {
+         return setFlags(lc, flags | PER_ITERATION_SCOPE);
+     }
  }