Add parsing for type aliases

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index a2c6f22e4e0696f7ac1087ca43b12f44acf43580..871bf7bb1ad25880cdc78aff0947d56fa8dbbba2 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -1289,6 +1289,18 @@ Statement* Parser::ParseStatementListItem(bool* ok) {
         return ParseVariableStatement(kStatementListItem, NULL, ok);
       }
       break;
+    case Token::IDENTIFIER: {
+      if (!scope_->typed()) break;
+      int pos = peek_position();
+      if (PeekContextualKeyword(CStrVector("type")) &&
+          PeekAhead() == Token::IDENTIFIER) {
+        Consume(Token::IDENTIFIER);
+        return ParseTypeAliasDeclaration(pos, ok);
+      }
+      break;
+    }
+    // TODO(nikolaos): interface
+    // TODO(nikolaos): ambient
     default:
       break;
   }