Hello all, I'm having a slight issue with the \tlp_put macros. I'd like to store something containing a literal `#1'. Using the current definition: \def_long_new:Npn \tlp_put_right:Nn #1#2{ \tlp_set:Nn \l_exp_tlp{#2} \tlp_set:Nx #1{\exp_not:o{#1}\exp_not:o{\l_exp_tlp}} } I get an error at the \tlp_set:Nn \l_exp_tlp stage. I wonder if there is a reason not to do: \def_long_new:Npn \tlp_put_right:Nn #1#2{ \tlp_set:Nx #1{\exp_not:o{#1}\exp_not:n{#2}} } which does not suffer from the same issue. -- Joseph Wright