[parser] Enforce module-specific identifier restriction

src/parsing/preparser.cc

Index: src/parsing/preparser.cc
diff --git a/src/parsing/preparser.cc b/src/parsing/preparser.cc
index c0db7ef9dd72c0dd02e41491229bce6fdbf74e4c..8712fff3b9896e8bb44bbc5d054c03ba37066121 100644
--- a/src/parsing/preparser.cc
+++ b/src/parsing/preparser.cc
@@ -38,8 +38,10 @@ void PreParserTraits::ReportMessageAt(int start_pos, int end_pos,
 
 
 PreParserIdentifier PreParserTraits::GetSymbol(Scanner* scanner) {
-  if (scanner->current_token() == Token::FUTURE_RESERVED_WORD) {
-    return PreParserIdentifier::FutureReserved();
+  if (scanner->current_token() == Token::ENUM) {
+    return PreParserIdentifier::Enum();
+  } else if (scanner->current_token() == Token::AWAIT) {
+    return PreParserIdentifier::Await();
   } else if (scanner->current_token() ==
              Token::FUTURE_STRICT_RESERVED_WORD) {
     return PreParserIdentifier::FutureStrictReserved();
@@ -100,7 +102,9 @@ PreParserExpression PreParserTraits::ParseFunctionLiteral(
 
 PreParser::PreParseResult PreParser::PreParseLazyFunction(
     LanguageMode language_mode, FunctionKind kind, bool has_simple_parameters,
-    ParserRecorder* log, Scanner::BookmarkScope* bookmark, int* use_counts) {
+    bool parsing_module, ParserRecorder* log, Scanner::BookmarkScope* bookmark,
+    int* use_counts) {
+  parsing_module_ = parsing_module;
   log_ = log;
   use_counts_ = use_counts;
   // Lazy functions always have trivial outer scopes (no with/catch scopes).
@@ -603,7 +607,8 @@ PreParser::Statement PreParser::ParseExpressionOrLabelledStatement(
   if (starts_with_identifier && expr.IsIdentifier() && peek() == Token::COLON) {
     // Expression is a single identifier, and not, e.g., a parenthesized
     // identifier.
-    DCHECK(!expr.AsIdentifier().IsFutureReserved());
+    DCHECK(!expr.AsIdentifier().IsEnum());
+    DCHECK(!parsing_module_ || !expr.AsIdentifier().IsAwait());
     DCHECK(is_sloppy(language_mode()) ||
            !IsFutureStrictReserved(expr.AsIdentifier()));
     Consume(Token::COLON);