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 fe75010c6ade94522250be38741ece8de3c19bc3..de7556f5749b20034e34395e3de4ea07b121def3 100644
--- a/src/scanner.cc
+++ b/src/scanner.cc
@@ -417,10 +417,12 @@ 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;
         }