Fix "use types" directive in modules

src/parsing/parser.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/parsing/parser.h"
 
 #include "src/api.h"
 #include "src/ast/ast.h"
 #include "src/ast/ast-expression-rewriter.h"
 #include "src/ast/ast-expression-visitor.h"
@@ skipping 1338 matching lines @@
           literal->raw_value()->IsString()) {
         // Ignore "use strict" directive in a module, check "use asm".
         if (literal->raw_value()->AsString() ==
                 ast_value_factory()->use_asm_string() &&
             token_loc.end_pos - token_loc.beg_pos ==
                 ast_value_factory()->use_asm_string()->length() + 2) {
           // Store the usage count; The actual use counter on the isolate is
           // incremented after parsing is done.
           ++use_counts_[v8::Isolate::kUseAsm];
           scope_->SetAsmModule();
+        // Check "use types".
+        } else if (allow_harmony_types() &&
+                   literal->raw_value()->AsString() ==
+                       ast_value_factory()->use_types_string() &&
+                   token_loc.end_pos - token_loc.beg_pos ==
+                       ast_value_factory()->use_types_string()->length() + 2) {
+          scope_->SetTyped();
         }
       } else {
         // End of the directive prologue.
         directive_prologue = false;
       }
     }
 
     body->Add(stat, zone());
   }
 
@@ skipping 5571 matching lines @@
                         try_block, target);
     final_loop = target;
   }
 
   return final_loop;
 }
 
 
 }  // namespace internal
 }  // namespace v8