Hello all, I've sent a snapshot to CTAN. Headlines: - Correct an error if \tl_rescan:(N)nn is applied to an entirely empty token list - Introduce support for (u)pTeX - New l3sys module to contain system/runtime-dependent functions - New experimental \char_generate:nn function to create tokens of (useful) catcodes in an expandable fashion The main reason for the release was some issues caused buy the first point: I will post separately about the other areas shortly. Please give CTAN 48 h to install the update and for it to propagate. Joseph