[parser] Enforce module-specific identifier restriction

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index 83f24273a7efd2c4a5449608efa2fb0a221cfb07..0cee8a01fb064c7ccc0ee4e939630f9b86da5933 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -920,7 +920,8 @@ FunctionLiteral* Parser::DoParseProgram(ParseInfo* info) {
     ZoneList<Statement*>* body = new(zone()) ZoneList<Statement*>(16, zone());
     bool ok = true;
     int beg_pos = scanner()->location().beg_pos;
-    if (info->is_module()) {
+    parsing_module_ = info->is_module();
+    if (parsing_module_) {
       ParseModuleItemList(body, &ok);
     } else {
       // Don't count the mode in the use counters--give the program a chance
@@ -1355,7 +1356,7 @@ void* Parser::ParseExportClause(ZoneList<const AstRawString*>* export_names,
     // Keep track of the first reserved word encountered in case our
     // caller needs to report an error.
     if (!reserved_loc->IsValid() &&
-        !Token::IsIdentifier(name_tok, STRICT, false)) {
+        !Token::IsIdentifier(name_tok, STRICT, false, parsing_module_)) {
       *reserved_loc = scanner()->location();
     }
     const AstRawString* local_name = ParseIdentifierName(CHECK_OK);
@@ -1406,7 +1407,8 @@ ZoneList<ImportDeclaration*>* Parser::ParseNamedImports(int pos, bool* ok) {
     if (CheckContextualKeyword(CStrVector("as"))) {
       local_name = ParseIdentifierName(CHECK_OK);
     }
-    if (!Token::IsIdentifier(scanner()->current_token(), STRICT, false)) {
+    if (!Token::IsIdentifier(scanner()->current_token(), STRICT, false,
+                             parsing_module_)) {
       *ok = false;
       ReportMessage(MessageTemplate::kUnexpectedReserved);
       return NULL;
@@ -4612,7 +4614,7 @@ PreParser::PreParseResult Parser::ParseLazyFunctionBodyWithPreParser(
   }
   PreParser::PreParseResult result = reusable_preparser_->PreParseLazyFunction(
       language_mode(), function_state_->kind(), scope_->has_simple_parameters(),
-      logger, bookmark);
+      parsing_module_, logger, bookmark);
   if (pre_parse_timer_ != NULL) {
     pre_parse_timer_->Stop();
   }