\clist_new:N
  \l_example_clist
\tl_count:N
  \l_example_clist
\str_count:N  % error on this line
  \l_example_clist
\seq_count:N  % error on this line
  \l_example_clist
\clist_count:N
  \l_example_clist
\prop_count:N  % error on this line
  \l_example_clist
\intarray_count:N  % error on this line
  \l_example_clist
\fparray_count:N  % error on this line
  \l_example_clist
