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lang-tex
\cs_generate_variant:Nninside a macro? Why all those_setand_gset? If you want an expandable function, you definitely have to leave those out. I'm not sure what you want to do, but you have\tl_item:nnat your disposition.generate_variant functionsout. I also changed all_settoNxthese are\edefs, so it should be closer to fully expandable.\edefis an assignment, so it's not expandable.\tl_gset:Nn \head_tl{\tl_head:f \start_tl}is completely wrong, because you probably want\tl_gset:Nf \head_tl {\tl_head:V \start_tl}; instead of\tl_gset:Nf \oldtail_tl {\start_tl }you should say\tl_gset_eq:NN \oldtail_tl \start_tl. But it's unclear why global setting is used.