Avoid exposing compiler-allocated temporaries to the debugger

test/mjsunit/harmony/debug-blockscopes.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 129 matching lines @@
     }
     count++;
   }
 
   // 'arguments' and might be exposed in the local and closure scope. Just
   // ignore this.
   var scope_size = scope.scopeObject().properties().length;
   if (!scope.scopeObject().property('arguments').isUndefined()) {
     scope_size--;
   }
-  // Also ignore synthetic variable from catch block.
-  if (!scope.scopeObject().property('.catch-var').isUndefined()) {
-    scope_size--;
-  }
   // Skip property with empty name.
   if (!scope.scopeObject().property('').isUndefined()) {
     scope_size--;
   }
-  // Also ignore synthetic variable from block scopes.
-  if (!scope.scopeObject().property('.block').isUndefined()) {
-    scope_size--;
-  }
 
   if (count != scope_size) {
     print('Names found in scope:');
     var names = scope.scopeObject().propertyNames();
     for (var i = 0; i < names.length; i++) {
       print(names[i]);
     }
   }
   assertEquals(count, scope_size);
 
@@ skipping 196 matching lines @@
   for (let x in {y:undefined}) {
     debugger;
   }
 }
 
 listener_delegate = function(exec_state) {
   CheckScopeChain([debug.ScopeType.Block,
                    debug.ScopeType.Local,
                    debug.ScopeType.Global], exec_state);
   CheckScopeContent({x:'y'}, 0, exec_state);
-  // The function scope contains a temporary iteration variable.
-  CheckScopeContent({'.for.x':'y'}, 1, exec_state);
+  // The function scope contains a temporary iteration variable, but it is
+  // hidden to the debugger.
+  CheckScopeContent({}, 1, exec_state);
 };
 for_loop_1();
 EndTest();
 
 
 // For-in loop over the keys of an object with a block scoped let variable
 // shadowing the iteration variable.
 BeginTest("For loop 2");
 
 function for_loop_2() {
   for (let x in {y:undefined}) {
     let x = 3;
     debugger;
   }
 }
 
 listener_delegate = function(exec_state) {
   CheckScopeChain([debug.ScopeType.Block,
                    debug.ScopeType.Block,
                    debug.ScopeType.Local,
                    debug.ScopeType.Global], exec_state);
   CheckScopeContent({x:3}, 0, exec_state);
   CheckScopeContent({x:'y'}, 1, exec_state);
-  // The function scope contains a temporary iteration variable.
-  CheckScopeContent({'.for.x':'y'}, 2, exec_state);
+  // The function scope contains a temporary iteration variable, hidden to the
+  // debugger.
+  CheckScopeContent({}, 2, exec_state);
 };
 for_loop_2();
 EndTest();
 
 
 // Simple for loop.
 BeginTest("For loop 3");
 
 function for_loop_3() {
   for (let x = 3; x < 4; ++x) {
@@ skipping 46 matching lines @@
 
 listener_delegate = function(exec_state) {
   CheckScopeChain([debug.ScopeType.Block,
                    debug.ScopeType.Local,
                    debug.ScopeType.Global], exec_state);
   CheckScopeContent({x:3,y:5}, 0, exec_state);
   CheckScopeContent({}, 1, exec_state);
 };
 for_loop_5();
 EndTest();