The LaTeX Team submitted an update to the
l3kernel
package.
Version number: 2018-08-23 License type: lppl1.3c
Summary description: LaTeX3 programming conventions
Announcement text: ----------------------------------------------------------------------
# Added - lua_escape:e, lua_now:e and lua_shipout_e:n - str_case_e:nn(TF) and str_if_eq:ee(TF) - sys_if_platform_unix:(TF) and sys_if_platform_windows:(TF) - l_(g)set_from_shell:Nnn - l3sys-shell for experimental shell functions
# Deprecated - lua_escape_x:n, lua_now_x:n and lua_shipout_x:n - str_case_x:nn(TF) and str_if_eq_x:nn(TF) ----------------------------------------------------------------------
This package is located at http://mirror.ctan.org/macros/latex/contrib/l3kernel
More information is at http://www.ctan.org/pkg/l3kernel
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Thanks for the upload.
For the CTAN Team Ina Dau