Implement handling of arrow functions in the parser

src/scanner.cc

Index: src/scanner.cc
diff --git a/src/scanner.cc b/src/scanner.cc
index 3c682014fe81ddffb401f50be5f23beb98ec034c..e0858c78641de6ae5f9b5987744c7ac2fd85ff42 100644
--- a/src/scanner.cc
+++ b/src/scanner.cc
@@ -466,10 +466,12 @@ void Scanner::Scan() {
         break;
 
       case '=':
-        // = == ===
+        // = == === =>
         Advance();
         if (c0_ == '=') {
           token = Select('=', Token::EQ_STRICT, Token::EQ);
+        } else if (c0_ == '>') {
+          token = Select(Token::ARROW);
         } else {
           token = Token::ASSIGN;
         }
@@ -1006,6 +1008,16 @@ static Token::Value KeywordOrIdentifierToken(const uint8_t* input,
 }
 
 
+bool Scanner::IdentifierIsFutureStrictReserved(
+    const AstRawString* string) const {
+  // Keywords are always 1-byte strings.
+  return string->is_one_byte() &&
+         Token::FUTURE_STRICT_RESERVED_WORD ==
+             KeywordOrIdentifierToken(string->raw_data(), string->length(),
+                                      harmony_scoping_, harmony_modules_);
+}
+
+
 Token::Value Scanner::ScanIdentifierOrKeyword() {
   ASSERT(unicode_cache_->IsIdentifierStart(c0_));
   LiteralScope literal(this);