Issue 4353 - Remove non standard for each syntax

utils/dumpast.js

 /**
  * Dumps the tree of the ast rooted at the given point.
  */
 function dump_ast(ast, prefix) {
         if (ast == null)
                 return;
         if (!prefix)
                 prefix = "";
         let str = prefix + "+ ";
         for (let key in ast) {
                 if (key == 'column' || key == 'line' || key == 'kids')
                         continue;
                 let val = (key == 'op' ? decode_op(ast[key]) :
         key == 'type' ? decode_type(ast[key]) :
         key == 'flags' ? ('0x' + ast[key].toString(16)) : ast[key]);
                 str += key + ": " + val + "; ";
         }
         str += ast.line + ":" + ast.column;
         _print(str);
         prefix += " ";
-        for each (let kid in ast.kids) {
+        for (let kid of ast.kids) {
                 dump_ast(kid, prefix);
         }
 }
 
 var global = this;
 var optable = null, toktable;
 function decode_op(opcode) {
         if (!optable) {
                 optable = [];
                 for (let key in global) {
@@ skipping 26 matching lines @@
         if (!prefix)
                 prefix = "";
         let str = prefix + "+ ";
   _print(prefix + ast.type + " @ " + ast.location + ":");
         for (let key in ast) {
                 if (key == 'type' || key == 'location' || key == 'visit')
                         continue;
     let val = ast[key];
     if (val instanceof Array) {
       _print(prefix + " + " + key + ": [");
-      for each (let kind in val) {
+      for (let kind of val) {
         dump_trueast(kind, prefix + "   ");
       }
       _print(prefix + "   ]");
     } else if (val instanceof Object && "type" in val) {
       _print(prefix + " + " + key + ":");
       dump_trueast(val, prefix + "   ");
     } else {
       _print(prefix + " + " + key + ": " + val);
     }
         }
 }