Add some known built-in types to consider as TYPE_NAME tokens instead of IDENTIFIERs

src/parser/parser.cc

@@ -200,7 +200,22 @@ void observe_type_name(const std::string & type_name)
     type_names.insert(type_name);
 }
 
+static const char * builtin_types[] = {
+    "__builtin_va_list",
+};
+
 bool is_type_name(const std::string & type_name)
 {
-    return type_names.count(type_name) != 0u;
+    if (type_names.count(type_name) != 0u)
+    {
+        return true;
+    }
+    for (size_t i = 0u; i < sizeof(builtin_types) / sizeof(builtin_types[0]); i++)
+    {
+        if (type_name == builtin_types[i])
+        {
+            return true;
+        }
+    }
+    return false;
 }