[AST] Add method to concatenate AstRawStrings

src/parsing/scanner.cc

Index: src/parsing/scanner.cc
diff --git a/src/parsing/scanner.cc b/src/parsing/scanner.cc
index 7ce84d1f21f582c3580cc5afe848c33443f67ad7..28b8fe5984f36948a3395419c5d3f367a3bd258a 100644
--- a/src/parsing/scanner.cc
+++ b/src/parsing/scanner.cc
@@ -107,6 +107,7 @@ uc32 Scanner::ScanUnlimitedLengthHexNumber(int max_value, int beg_pos) {
 STATIC_ASSERT(Token::NUM_TOKENS <= 0x100);
 
 // Table of one-character tokens, by character (0x00..0x7f only).
+// clang-format off
 static const byte one_char_tokens[] = {
   Token::ILLEGAL,
   Token::ILLEGAL,
@@ -143,7 +144,7 @@ static const byte one_char_tokens[] = {
   Token::ILLEGAL,
   Token::ILLEGAL,
   Token::ILLEGAL,
-  Token::ILLEGAL,
+  Token::HASH,         // 0x23
   Token::ILLEGAL,
   Token::ILLEGAL,
   Token::ILLEGAL,
@@ -237,7 +238,7 @@ static const byte one_char_tokens[] = {
   Token::BIT_NOT,      // 0x7e
   Token::ILLEGAL
 };
-
+// clang-format on
 
 Token::Value Scanner::Next() {
   if (next_.token == Token::EOS) {
@@ -711,6 +712,10 @@ void Scanner::Scan() {
         token = Select(Token::BIT_NOT);
         break;
 
+      case '#':
+        token = Select(Token::HASH);
+        break;
+
       case '`':
         token = ScanTemplateStart();
         break;