Don't reflect ES2015 Function name inference in Function.prototype.toString

src/objects.cc

 // Copyright 2015 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 13405 matching lines @@
       if (shared_info->is_generator()) builder.AppendCharacter('*');
     } else {
       if (shared_info->is_generator()) {
         builder.AppendCString("function* ");
       } else {
         builder.AppendCString("function ");
       }
     }
     if (shared_info->name_should_print_as_anonymous()) {
       builder.AppendCString("anonymous");
-    } else {
+    } else if (!shared_info->is_anonymous_expression()) {
       builder.AppendString(handle(String::cast(shared_info->name()), isolate));
     }
   }
   builder.AppendString(Handle<String>::cast(shared_info->GetSourceCode()));
   return builder.Finish().ToHandleChecked();
 }
 
 
 void Oddball::Initialize(Isolate* isolate, Handle<Oddball> oddball,
                          const char* to_string, Handle<Object> to_number,
@@ skipping 414 matching lines @@
 }
 
 
 void SharedFunctionInfo::InitFromFunctionLiteral(
     Handle<SharedFunctionInfo> shared_info, FunctionLiteral* lit) {
   shared_info->set_length(lit->scope()->default_function_length());
   shared_info->set_internal_formal_parameter_count(lit->parameter_count());
   shared_info->set_function_token_position(lit->function_token_position());
   shared_info->set_start_position(lit->start_position());
   shared_info->set_end_position(lit->end_position());
-  shared_info->set_is_expression(lit->is_expression());
-  shared_info->set_is_anonymous(lit->is_anonymous());
+  shared_info->set_is_declaration(lit->is_declaration());
+  shared_info->set_is_named_expression(lit->is_named_expression());
+  shared_info->set_is_anonymous_expression(lit->is_anonymous_expression());
   shared_info->set_inferred_name(*lit->inferred_name());
   shared_info->set_allows_lazy_compilation(lit->AllowsLazyCompilation());
   shared_info->set_allows_lazy_compilation_without_context(
       lit->AllowsLazyCompilationWithoutContext());
   shared_info->set_language_mode(lit->language_mode());
   shared_info->set_uses_arguments(lit->scope()->arguments() != NULL);
   shared_info->set_has_duplicate_parameters(lit->has_duplicate_parameters());
   shared_info->set_ast_node_count(lit->ast_node_count());
   shared_info->set_is_function(lit->is_function());
   if (lit->dont_optimize_reason() != kNoReason) {
@@ skipping 6005 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8