Don't use deprecated checked_array_iterator

test/scan.h

@@ -167,10 +167,8 @@ struct scan_handler : error_handler {
   void on_text(const char* begin, const char* end) {
     auto size = to_unsigned(end - begin);
     auto it = scan_ctx_.begin();
-    if (it + size > scan_ctx_.end() ||
-        !std::equal(begin, end, make_checked(it, size))) {
+    if (it + size > scan_ctx_.end() || !std::equal(begin, end, it))
       on_error("invalid input");
-    }
     scan_ctx_.advance_to(it + size);
   }