Parse harmony let declarations.

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 139 matching lines @@
   }
   // 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--;
   }
 
-  // TODO(keuchel): print('count' + count + ' scopesize' + 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);
 
   // Get the debug command processor.
@@ skipping 58 matching lines @@
   CheckScopeContent({a:1}, 1, exec_state);
 };
 local_2(1);
 EndTest();
 
 
 // Local scope with a parameter and a local variable.
 BeginTest("Local 3");
 
 function local_3(a) {
-  var x = 3;
+  let x = 3;
   debugger;
 }
 
 listener_delegate = function(exec_state) {
   CheckScopeChain([debug.ScopeType.Local,
                    debug.ScopeType.Global], exec_state);
   CheckScopeContent({a:1,x:3}, 0, exec_state);
 };
 local_3(1);
 EndTest();
 
 
 // Local scope with parameters and local variables.
 BeginTest("Local 4");
 
 function local_4(a, b) {
-  var x = 3;
-  var y = 4;
+  let x = 3;
+  let y = 4;
   debugger;
 }
 
 listener_delegate = function(exec_state) {
   CheckScopeChain([debug.ScopeType.Local,
                    debug.ScopeType.Global], exec_state);
   CheckScopeContent({a:1,b:2,x:3,y:4}, 0, exec_state);
 };
 local_4(1, 2);
 EndTest();
@@ skipping 86 matching lines @@
                    debug.ScopeType.With,
                    debug.ScopeType.Local,
                    debug.ScopeType.Global], exec_state);
   CheckScopeContent({a:2,b:1}, 1, exec_state);
   CheckScopeContent({a:1,b:2}, 3, exec_state);
 };
 with_block_4();
 EndTest();
 
 
-// TODO(keuchel):
 // Simple closure formed by returning an inner function referering to an outer
 // block local variable and an outer function's parameter.
-// BeginTest("Closure 1");
-//
-// function closure_1(a) {
-//   {
-//     let x = 3;
-//     function f() {
-//       debugger;
-//       return a + x;
-//     };
-//   }
-//   return f;
-// }
-//
-// listener_delegate = function(exec_state) {
-//   CheckScopeChain([debug.ScopeType.Local,
-//                    debug.ScopeType.Closure,
-//                    debug.ScopeType.Global], exec_state);
-//   // CheckScopeContent({}, 0, exec_state);
-//   // CheckScopeContent({}, 1, exec_state);
-//   // CheckScopeContent({a:1}, 2, exec_state);
-// };
-// closure_1(1)();
-// EndTest();
+BeginTest("Closure 1");
+
+function closure_1(a) {
+  var x = 2;
+  let y = 3;
+  if (true) {
+    let z = 4;
+    function f() {
+      debugger;
+      return a + x + y + z;
+    };
+    return f;
+  }
+}
+
+listener_delegate = function(exec_state) {
+  CheckScopeChain([debug.ScopeType.Local,
+                   debug.ScopeType.Block,
+                   debug.ScopeType.Closure,
+                   debug.ScopeType.Global], exec_state);
+  CheckScopeContent({}, 0, exec_state);
+  CheckScopeContent({a:1,x:2,y:3}, 2, exec_state);
+};
+closure_1(1)();
+EndTest();