% \iffalse meta-comment
%
%% File: l3deprecation.dtx
%
% Copyright (C) 2017-2026 The LaTeX Project
%
% It may be distributed and/or modified under the conditions of the
% LaTeX Project Public License (LPPL), either version 1.3c of this
% license or (at your option) any later version.  The latest version
% of this license is in the file
%
%    https://www.latex-project.org/lppl.txt
%
% This file is part of the "l3kernel bundle" (The Work in LPPL)
% and all files in that bundle must be distributed together.
%
% -----------------------------------------------------------------------
%
% The development version of the bundle can be found at
%
%    https://github.com/latex3/latex3
%
% for those people who are interested.
%
%<*driver>
\documentclass[full,kernel]{l3doc}
\begin{document}
  \DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \title{^^A
%   The \pkg{l3deprecation} module\\ Deprecation errors^^A
% }
%
% \author{^^A
%  The \LaTeX{} Project\thanks
%    {^^A
%      E-mail:
%        \href{mailto:latex-team@latex-project.org}
%          {latex-team@latex-project.org}^^A
%    }^^A
% }
%
% \date{Released 2026-05-15}
%
% \maketitle
%
% \begin{documentation}
%
% \section{\pkg{l3deprecation} documentation}
%
% A few commands have had to be deprecated over the years.
% All commands deprecated before release 2022-01-12 were already
% removed; commands deprecated since then will no longer be removed.
% Instead, this module defines them to produce errors.
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3deprecation} implementation}
%
%    \begin{macrocode}
%<*code>
%    \end{macrocode}
%
%    \begin{macrocode}
%<@@=deprecation>
%    \end{macrocode}
%
% \subsection{Patching definitions to deprecate}
%
% \begin{quote}
%   \cs{__kernel_patch_deprecation:nnNNpn} \Arg{date} \Arg{replacement}
%   \meta{definition} \meta{function} \meta{parameters} \Arg{code}
% \end{quote}
% defines the \meta{function} to produce an error and run its
% \meta{code}.
%
% We make \cs{debug_on:n} |{deprecation}| turn the \meta{function} into
% an \tn{outer} error, and \cs{debug_off:n} |{deprecation}| restore
% whatever the behavior was without \cs{debug_on:n} |{deprecation}|.
%
% In the explanations below, \meta{definition} \meta{function}
% \meta{parameters} \Arg{code} or assignments that only differ in the
% scope of the \meta{definition} will be called \enquote{the standard
% definition}.
%
% \begin{macro}
%   {
%     \__kernel_patch_deprecation:nnNNpn, \@@_patch_aux:nnNNnn,
%     \@@_warn_once:nnNnn,
%     \@@_patch_aux:Nn,
%     \@@_just_error:nnNN
%   }
%   (The parameter text is grabbed using |#5#|.)  The arguments of
%   \cs{__kernel_deprecation_code:nn} are run upon \cs{debug_on:n}
%   |{deprecation}| and \cs{debug_off:n} |{deprecation}|, respectively.
%   In both scenarios we the \meta{function} may be \tn{outer} so we
%   undefine it with \cs{tex_let:D} before redefining it, with
%   \cs{__kernel_deprecation_error:Nnn} or with some code added shortly.
%    \begin{macrocode}
\cs_new_protected:Npn \__kernel_patch_deprecation:nnNNpn #1#2#3#4#5#
  { \@@_patch_aux:nnNNnn {#1} {#2} #3 #4 {#5} }
\cs_new_protected:Npn \@@_patch_aux:nnNNnn #1#2#3#4#5#6
  {
    \__kernel_deprecation_code:nn
      {
        \tex_let:D #4 \scan_stop:
        \__kernel_deprecation_error:Nnn #4 {#2} {#1}
      }
      { \tex_let:D #4 \scan_stop: }
    \cs_if_eq:NNTF #3 \cs_gset_protected:Npn
      { \@@_warn_once:nnNnn {#1} {#2} #4 {#5} {#6} }
      { \@@_patch_aux:Nn #3 { #4 #5 {#6} } }
  }
%    \end{macrocode}
%   In case we want a warning, the \meta{function} is defined to produce
%   such a warning without grabbing any argument, then redefine itself
%   to the standard definition that the \meta{function} should have,
%   with arguments, and call that definition.  The \texttt{e}-type
%   expansion and \cs{exp_not:n} avoid needing to double the~|#|, which
%   we could not do anyways.  We then deal with the code for
%   \cs{debug_off:n} |{deprecation}|: presumably someone doing that does
%   not need the warning so we simply do the standard definition.
%    \begin{macrocode}
\cs_new_protected:Npn \@@_warn_once:nnNnn #1#2#3#4#5
  {
    \cs_gset_protected:Npe #3
      {
        \__kernel_if_debug:TF
          {
            \exp_not:N \msg_warning:nneee
              { deprecation } { deprecated-command }
              {#1}
              { \token_to_str:N #3 }
              { \tl_to_str:n {#2} }
          }
          { }
        \exp_not:n { \cs_gset_protected:Npn #3 #4 {#5} }
        \exp_not:N #3
      }
    \__kernel_deprecation_code:nn { }
      { \cs_set_protected:Npn #3 #4 {#5} }
  }
%    \end{macrocode}
%   In case we want neither warning nor error, the \meta{function} is
%   given its standard definition.  Here |#1| is \cs{cs_new:Npn} or
%   \cs{cs_new_protected:Npn}) and |#2| is \meta{function}
%   \meta{parameters} \Arg{code}, so |#1#2| performs the assignment.
%   For \cs{debug_off:n} |{deprecation}| we want to use the same
%   assignment but with a different scope, hence the \cs{cs_if_eq:NNTF}
%   test.
%    \begin{macrocode}
\cs_new_protected:Npn \@@_patch_aux:Nn #1#2
  {
    #1 #2
    \cs_if_eq:NNTF #1 \cs_gset_protected:Npn
      { \__kernel_deprecation_code:nn { } { \cs_set_protected:Npn #2 } }
      { \__kernel_deprecation_code:nn { } { \cs_set:Npn #2 } }
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\__kernel_deprecation_error:Nnn}
%   The \tn{outer} definition here ensures the command cannot appear
%   in an argument.
%    \begin{macrocode}
\cs_new_protected:Npn \__kernel_deprecation_error:Nnn #1#2#3
  {
    \tex_protected:D \tex_outer:D \tex_edef:D #1
      {
        \exp_not:N \msg_expandable_error:nnnnn
          { deprecation } { deprecated-command }
          { \tl_to_str:n {#3} } { \token_to_str:N #1 } { \tl_to_str:n {#2} }
        \exp_not:N \msg_error:nneee
          { deprecation } { deprecated-command }
          { \tl_to_str:n {#3} } { \token_to_str:N #1 } { \tl_to_str:n {#2} }
      }
  }
%    \end{macrocode}
% \end{macro}
%
%    \begin{macrocode}
\msg_new:nnn { deprecation } { deprecated-command }
  {
    \tl_if_blank:nF {#3} { Use~ \tl_trim_spaces:n {#3} ~not~ }
    #2~deprecated~on~#1.
  }
%    \end{macrocode}
%
% \subsection{Deprecated \pkg{l3basics} functions}
%
%    \begin{macrocode}
%<@@=cs>
%    \end{macrocode}
%
% \begin{macro}[EXP, deprecated]{\cs_argument_spec:N}
%   For the present, do not deprecate fully as \LaTeXe{} will need to catch
%   up: one for Fall 2022.
%    \begin{macrocode}
%\__kernel_patch_deprecation:nnNNpn { 2022-06-24 } { \cs_parameter_spec:N }
\cs_new:Npn \cs_argument_spec:N { \cs_parameter_spec:N }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Deprecated \pkg{l3file} functions}
%
%    \begin{macrocode}
%<@@=file>
%    \end{macrocode}
%
% \begin{macro}[deprecated]
%   {
%     \iow_shipout_x:Nn, \iow_shipout_x:Nx,
%     \iow_shipout_x:cn, \iow_shipout_x:cx
%   }
%   Previously described as \texttt{x}-type, but the hash behavior is really
%   \texttt{e}-type. Currently not \enquote{live} as we need to have a transition.
%    \begin{macrocode}
% \__kernel_patch_deprecation:nnNNpn { 2023-10-10 } { \iow_shipout_e:Nn }
\cs_new_protected:Npn \iow_shipout_x:Nn { \iow_shipout_e:Nn }
\cs_generate_variant:Nn \iow_shipout_x:Nn { Nx , c, cx }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Deprecated \pkg{l3keys} functions}
%
%    \begin{macrocode}
%<@@=keys>
%    \end{macrocode}
%
% \begin{macro}[deprecated]{.str_set_x:N, .str_set_x:c}
% \begin{macro}[deprecated]{.str_gset_x:N, .str_gset_x:c}
%    \begin{macrocode}
\cs_new_protected:cpn { \c_@@_props_root_str .str_set_x:N } #1
  { \@@_variable_set:NnnN #1 { str } { } x }
\cs_new_protected:cpn { \c_@@_props_root_str .str_set_x:c } #1
  { \@@_variable_set:cnnN {#1} { str } { } x }
\cs_new_protected:cpn { \c_@@_props_root_str .str_gset_x:N } #1
  { \@@_variable_set:NnnN #1 { str } { g } x }
\cs_new_protected:cpn { \c_@@_props_root_str .str_gset_x:c } #1
  { \@@_variable_set:cnnN {#1} { str } { g } x }
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[deprecated]{.tl_set_x:N, .tl_set_x:c}
% \begin{macro}[deprecated]{.tl_gset_x:N, .tl_gset_x:c}
%    \begin{macrocode}
\cs_new_protected:cpn { \c_@@_props_root_str .tl_set_x:N } #1
  { \@@_variable_set:NnnN #1 { tl } { } x }
\cs_new_protected:cpn { \c_@@_props_root_str .tl_set_x:c } #1
  { \@@_variable_set:cnnN {#1} { tl } { } x }
\cs_new_protected:cpn { \c_@@_props_root_str .tl_gset_x:N } #1
  { \@@_variable_set:NnnN #1 { tl } { g } x }
\cs_new_protected:cpn { \c_@@_props_root_str .tl_gset_x:c } #1
  { \@@_variable_set:cnnN {#1} { tl } { g } x }
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[deprecated]
%   {
%     \keys_set_filter:nnnN, \keys_set_filter:nnVN,
%     \keys_set_filter:nnvN, \keys_set_filter:nnoN
%   }
% \begin{macro}[deprecated]
%   {
%     \keys_set_filter:nnnnN, \keys_set_filter:nnVnN,
%     \keys_set_filter:nnvnN, \keys_set_filter:nnonN
%   }
% \begin{macro}[deprecated]
%   {
%     \keys_set_filter:nnn, \keys_set_filter:nnV,
%     \keys_set_filter:nnv, \keys_set_filter:nno
%   }
%   We need a transition here so for the present this is commented out:
%   only needed for \texttt{latex-lab} code so this should not last for
%   too long.
%    \begin{macrocode}
%\__kernel_patch_deprecation:nnNNpn { 2024-01-10 } { \keys_set_exclude_groups:nnn }
\cs_new_protected:Npn \keys_set_filter:nnn { \keys_set_exclude_groups:nnn }
\cs_generate_variant:Nn \keys_set_filter:nnn { nnV , nnv , nno }
%\__kernel_patch_deprecation:nnNNpn { 2024-01-10 } { \keys_set_exclude_groups:nnnN }
\cs_new_protected:Npn  \keys_set_filter:nnnN { \keys_set_exclude_groups:nnnN }
\cs_generate_variant:Nn \keys_set_filter:nnnN { nnV , nnv , nno }
%\__kernel_patch_deprecation:nnNNpn { 2024-01-10 } { \keys_set_exclude_groups:nnnnN }
\cs_new_protected:Npn  \keys_set_filter:nnnnN { \keys_set_exclude_groups:nnnnN }
\cs_generate_variant:Nn \keys_set_filter:nnnnN { nnV , nnv , nno }
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsection{Deprecated \pkg{l3msg} functions}
%
%    \begin{macrocode}
%<@@=msg>
%    \end{macrocode}
%
% \begin{macro}[deprecated]{\msg_gset:nnnn, \msg_gset:nnn}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2024-02-13 } { \msg_set:nnnn }
\cs_new_protected:Npn \msg_gset:nnnn { \msg_set:nnnn }
\__kernel_patch_deprecation:nnNNpn { 2024-02-13 } { \msg_set:nnn }
\cs_new_protected:Npn \msg_gset:nnn { \msg_set:nnn }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Deprecated \pkg{l3pdf} functions}
%
%    \begin{macrocode}
%<@@=pdf>
%    \end{macrocode}
%
% \begin{variable}[deprecated]{\g_@@_object_prop}
%   For tracking objects.
%    \begin{macrocode}
\prop_new:N \g_@@_object_prop
%    \end{macrocode}
% \end{variable}
%
% \begin{macro}[deprecated]
%   {\pdf_object_new:nn, \pdf_object_write:nn, \pdf_object_write:nx}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2022-08-30 } { [\pdf_object_new:n] }
\cs_new_protected:Npn \pdf_object_new:nn #1#2
  {
    \prop_gput:Nnn \g_@@_object_prop {#1} {#2}
    \pdf_object_new:n {#1}
  }
\__kernel_patch_deprecation:nnNNpn { 2022-08-30 } { [\pdf_object_write:n] }
\cs_new_protected:Npn \pdf_object_write:nn #1#2
  {
    \exp_args:Nee \@@_backend_object_write:nnn
      { \@@_object_retrieve:n {#1} }
      { \prop_item:Nn \g_@@_object_prop {#1} } {#2}
    \bool_gset_true:N \g_@@_init_bool
  }
\cs_generate_variant:Nn \pdf_object_write:nn { nx }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Deprecated \pkg{l3prg} functions}
%
%    \begin{macrocode}
%<@@=cs>
%    \end{macrocode}
%
% \begin{macro}[EXP, noTF, deprecated]{\bool_case_true:n}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2023-05-03 } { \bool_case:n }
\cs_new:Npn \bool_case_true:n { \bool_case:n }
\__kernel_patch_deprecation:nnNNpn { 2023-05-03 } { \bool_case:nT }
\cs_new:Npn \bool_case_true:nT { \bool_case:nT }
\__kernel_patch_deprecation:nnNNpn { 2023-05-03 } { \bool_case:nF }
\cs_new:Npn \bool_case_true:nF { \bool_case:nF }
\__kernel_patch_deprecation:nnNNpn { 2023-05-03 } { \bool_case:nTF }
\cs_new:Npn \bool_case_true:nTF { \bool_case:nTF }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Deprecated \pkg{l3regex} functions}
%
%    \begin{macrocode}
%<@@=regex>
%    \end{macrocode}
%
% \begin{macro}[TF, deprecated]{\regex_match:nn, \regex_match:nV}
% \begin{macro}[TF, deprecated]{\regex_match:Nn, \regex_match:NV}
%    \begin{macrocode}
%\__kernel_patch_deprecation:nnNNpn { 2025-05-14 } { \regex_if_match:nnT }
\cs_new_protected:Npn \regex_match:nnT { \regex_if_match:nnT }
%\__kernel_patch_deprecation:nnNNpn { 2025-05-14 } { \regex_if_match:nnF }
\cs_new_protected:Npn \regex_match:nnF { \regex_if_match:nnF }
%\__kernel_patch_deprecation:nnNNpn { 2025-05-14 } { \regex_if_match:nnTF }
\cs_new_protected:Npn \regex_match:nnTF { \regex_if_match:nnTF }
%\__kernel_patch_deprecation:nnNNpn { 2025-05-14 } { \regex_if_match:NnT }
\cs_new_protected:Npn \regex_match:NnT { \regex_if_match:NnT }
%\__kernel_patch_deprecation:nnNNpn { 2025-05-14 } { \regex_if_match:NnF }
\cs_new_protected:Npn \regex_match:NnF { \regex_if_match:NnF }
%\__kernel_patch_deprecation:nnNNpn { 2025-05-14 } { \regex_if_match:NnTF }
\cs_new_protected:Npn \regex_match:NnTF { \regex_if_match:NnTF }
\prg_generate_conditional_variant:Nnn \regex_match:nn
  { nV } { T , F , TF }
\prg_generate_conditional_variant:Nnn \regex_match:Nn
  { NV } { T , F , TF }
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsection{Deprecated \pkg{l3str} functions}
%
%    \begin{macrocode}
%<@@=str>
%    \end{macrocode}
%
% \begin{macro}[EXP, deprecated]
%   {
%     \str_lower_case:n, \str_lower_case:f,
%     \str_upper_case:n, \str_upper_case:f,
%     \str_fold_case:n,  \str_fold_case:V
%   }
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \str_lowercase:n }
\cs_new:Npn \str_lower_case:n { \str_lowercase:n }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \str_lowercase:f }
\cs_new:Npn \str_lower_case:f { \str_lowercase:f }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \str_uppercase:n }
\cs_new:Npn \str_upper_case:n { \str_uppercase:n }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \str_uppercase:f }
\cs_new:Npn \str_upper_case:f { \str_uppercase:f }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \str_casefold:n }
\cs_new:Npn \str_fold_case:n { \str_casefold:n }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \str_casefold:V }
\cs_new:Npn \str_fold_case:V { \str_casefold:V }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP, deprecated]
%   {\str_foldcase:n,  \str_foldcase:V}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2020-10-17 } { \str_casefold:n }
\cs_new:Npn \str_foldcase:n { \str_casefold:n }
\__kernel_patch_deprecation:nnNNpn { 2022-10-17 } { \str_casefold:V }
\cs_new:Npn \str_foldcase:V { \str_casefold:V }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP, deprecated]
%   {\str_declare_eight_bit_encoding:nnn}
%   This command was made internal, with one more argument.  There is no
%   easy way to compute a reasonable value for that extra argument so we
%   take a value that is big enough to accommodate all of Unicode.
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2020-08-20 } { }
\cs_new_protected:Npn \str_declare_eight_bit_encoding:nnn #1
  { \@@_declare_eight_bit_encoding:nnnn {#1} { 1114112 } }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Deprecated \pkg{l3seq} functions}
%
%    \begin{macrocode}
%<@@=seq>
%    \end{macrocode}
%
% \begin{macro}[deprecated]{\seq_indexed_map_inline:Nn}
% \begin{macro}[EXP, deprecated]{ \seq_indexed_map_function:NN}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2020-06-18 } { \seq_map_indexed_inline:Nn }
\cs_new_protected:Npn \seq_indexed_map_inline:Nn { \seq_map_indexed_inline:Nn }
\__kernel_patch_deprecation:nnNNpn { 2020-06-18 } { \seq_map_indexed_function:NN }
\cs_new:Npn \seq_indexed_map_function:NN { \seq_map_indexed_function:NN }
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[deprecated]{\seq_mapthread_function:NNN}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2023-05-10 } { \seq_map_pairwise_function:NNN }
\cs_new:Npn \seq_mapthread_function:NNN { \seq_map_pairwise_function:NNN }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[deprecated]{\seq_set_map_x:NNn, \seq_gset_map_x:NNn}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2023-10-26 } { \seq_set_map_e:NNn }
\cs_new_protected:Npn \seq_set_map_x:NNn { \seq_set_map_e:NNn }
\__kernel_patch_deprecation:nnNNpn { 2023-10-26 } { \seq_gset_map_e:NNn }
\cs_new_protected:Npn \seq_gset_map_x:NNn { \seq_gset_map_e:NNn }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Deprecated \pkg{l3sys} functions}
%
%    \begin{macrocode}
%<@@=sys>
%    \end{macrocode}
%
% \begin{macro}[deprecated]{\sys_finalise:}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2025-05-25 } { \sys_finalize: }
\cs_new_protected:Npn \sys_finalise: { \sys_finalize: }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[deprecated]{\sys_load_deprecation:}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2021-01-11 } { (no~longer~required) }
\cs_new_protected:Npn \sys_load_deprecation: { }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[deprecated, EXP, pTF]{\sys_if_timer_exist:}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2025-03-26 } { (no~longer~required) }
\cs_new:Npn \sys_if_timer_exist:T #1 {#1}
\__kernel_patch_deprecation:nnNNpn { 2025-03-26 } { (no~longer~required) }
\cs_new:Npn \sys_if_timer_exist:F #1 { }
\__kernel_patch_deprecation:nnNNpn { 2025-03-26 } { (no~longer~required) }
\cs_new:Npn \sys_if_timer_exist:TF #1#2 {#1}
\__kernel_patch_deprecation:nnNNpn { 2025-03-26 } { (no~longer~required) }
\cs_new:Npn \sys_if_timer_exist_p: { \c_true_bool }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Deprecated \pkg{l3text} functions}
%
%    \begin{macrocode}
%<@@=text>
%    \end{macrocode}
%
% \begin{macro}[EXP, deprecated]{\text_titlecase:n}
% \begin{macro}[EXP, deprecated]{\text_titlecase:nn}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2023-07-08 } { \text_titlecase_first:n }
\cs_new:Npn \text_titlecase:n #1
  { \text_titlecase_first:n { \text_lowercase:n {#1} } }
\__kernel_patch_deprecation:nnNNpn { 2023-07-08 } { \text_titlecase_first:nn }
\cs_new:Npn \text_titlecase:nn #1#2
  { \text_titlecase_first:nn {#1} { \text_lowercase:n {#2} } }
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsection{Deprecated \pkg{l3tl} functions}
%
%    \begin{macrocode}
%<@@=tl>
%    \end{macrocode}
%
% \begin{macro}[deprecated]
%   {
%     \tl_lower_case:n, \tl_lower_case:nn,
%     \tl_upper_case:n, \tl_upper_case:nn,
%     \tl_mixed_case:n, \tl_mixed_case:nn,
%   }
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \text_lowercase:n }
\cs_new:Npn \tl_lower_case:n #1
  { \text_lowercase:n {#1} }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \text_lowercase:nn }
\cs_new:Npn \tl_lower_case:nn #1#2
  { \text_lowercase:nn {#1} {#2} }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \text_uppercase:n }
\cs_new:Npn \tl_upper_case:n #1
  { \text_uppercase:n {#1} }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \text_uppercase:nn }
\cs_new:Npn \tl_upper_case:nn #1#2
  { \text_uppercase:nn {#1} {#2} }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \text_titlecase_first:n }
\cs_new:Npn \tl_mixed_case:n #1
  { \text_titlecase_first:n { \text_lowercase:n {#1} } }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \text_titlecase_first:nn }
\cs_new:Npn \tl_mixed_case:nn #1#2
  { \text_titlecase_first:nn {#1} { \text_lowercase:n {#2} } }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[noTF, deprecated]{\tl_case:Nn, \tl_case:cn}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2022-05-23 } { \token_case_meaning:Nn }
\cs_new:Npn \tl_case:Nn { \token_case_meaning:Nn }
\__kernel_patch_deprecation:nnNNpn { 2022-05-23 } { \token_case_meaning:NnT }
\cs_new:Npn \tl_case:NnT { \token_case_meaning:NnT }
\__kernel_patch_deprecation:nnNNpn { 2022-05-23 } { \token_case_meaning:NnF }
\cs_new:Npn \tl_case:NnF { \token_case_meaning:NnF }
\__kernel_patch_deprecation:nnNNpn { 2022-05-23 } { \token_case_meaning:NnTF }
\cs_new:Npn \tl_case:NnTF { \token_case_meaning:NnTF }
\cs_generate_variant:Nn \tl_case:Nn   { c }
\prg_generate_conditional_variant:Nnn \tl_case:Nn
  { c } { T , F , TF }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[deprecated]{\tl_build_clear:N, \tl_build_gclear:N}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2023-10-18 } { \tl_build_begin:N }
\cs_new_protected:Npn \tl_build_clear:N { \tl_build_begin:N }
\__kernel_patch_deprecation:nnNNpn { 2023-10-18 } { \tl_build_gbegin:N }
\cs_new_protected:Npn \tl_build_gclear:N { \tl_build_gbegin:N }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[deprecated]{\tl_build_get:NN}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2023-10-25 } { \tl_build_get_intermediate:NN }
\cs_new_protected:Npn \tl_build_get:NN { \tl_build_get_intermediate:NN }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Deprecated \pkg{l3token} functions}
%
%    \begin{macrocode}
%<@@=char>
%    \end{macrocode}
%
% \begin{macro}[EXP, deprecated]{\char_to_utfviii_bytes:n}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2022-10-09 } { [ \codepoint_generate:nn ] }
\cs_new:Npn \char_to_utfviii_bytes:n { \__kernel_codepoint_to_bytes:n }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP, deprecated]{\char_to_nfd:N, \char_to_nfd:n}
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2022-10-09 } { \codepoint_to_nfd:n }
\cs_new:Npn \char_to_nfd:N #1 { \codepoint_to_nfd:n {`#1} }
\__kernel_patch_deprecation:nnNNpn { 2022-10-09 } { \codepoint_to_nfd:n }
\cs_new:Npn \char_to_nfd:n { \codepoint_to_nfd:n }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP, deprecated]
%   {
%     \char_lower_case:N, \char_upper_case:N,
%     \char_mixed_case:Nn, \char_fold_case:N,
%     \char_str_lower_case:N, \char_str_upper_case:N,
%     \char_str_mixed_case:N, \char_str_fold_case:N,
%   }
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \text_lowercase:n }
\cs_new:Npn \char_lower_case:N { \text_lowercase:n }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \text_uppercase:n }
\cs_new:Npn \char_upper_case:N { \text_uppercase:n }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \text_titlecase_first:n }
\cs_new:Npn \char_mixed_case:N { \text_titlecase_first:n }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \str_casefold:n }
\cs_new:Npn \char_fold_case:N { \str_casefold:n }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \str_lowercase:n }
\cs_new:Npn \char_str_lower_case:N { \str_lowercase:n }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \str_uppercase:n }
\cs_new:Npn \char_str_upper_case:N { \str_uppercase:n }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \str_titlecase:n }
\cs_new:Npn \char_str_mixed_case:N { \str_titlecase:n }
\__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \str_casefold:n }
\cs_new:Npn \char_str_fold_case:N { \str_casefold:n }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP, deprecated]
%   {
%     \char_lowercase:N, \char_titlecase:N, \char_uppercase:N,
%     \char_foldcase:N,
%     \char_str_lowercase:N, \char_str_titlecase:N, \char_str_uppercase:N,
%     \char_str_foldcase:N,
%   }
%    \begin{macrocode}
\__kernel_patch_deprecation:nnNNpn { 2022-10-17 } { \text_lowercase:n }
\cs_new:Npn \char_lowercase:N { \text_lowercase:n }
\__kernel_patch_deprecation:nnNNpn { 2022-10-17 } { \text_uppercase:n }
\cs_new:Npn \char_uppercase:N { \text_uppercase:n }
\__kernel_patch_deprecation:nnNNpn { 2022-10-17 } { \text_titlecase_first:n }
\cs_new:Npn \char_titlecase:N { \text_titlecase_first:n }
\__kernel_patch_deprecation:nnNNpn { 2022-10-17 } { \str_casefold:n }
\cs_new:Npn \char_foldcase:N { \str_casefold:n }
\__kernel_patch_deprecation:nnNNpn { 2022-10-17 } { \str_lowercase:n }
\cs_new:Npn \char_str_lowercase:N { \str_lowercase:n }
\__kernel_patch_deprecation:nnNNpn { 2022-10-17 }
  { \tl_to_str:e { \text_titlecase_first:n } }
\cs_new:Npn \char_str_titlecase:N #1
  { \tl_to_str:e { \text_titlecase_first:n {#1} } }
\__kernel_patch_deprecation:nnNNpn { 2022-10-17 } { \str_uppercase:n }
\cs_new:Npn \char_str_uppercase:N { \str_uppercase:n }
\__kernel_patch_deprecation:nnNNpn { 2022-10-17 } { \str_casefold:n }
\cs_new:Npn \char_str_foldcase:N { \str_casefold:n }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[TF, deprecated]
%   {
%     \peek_catcode_ignore_spaces:N, \peek_catcode_remove_ignore_spaces:N,
%     \peek_charcode_ignore_spaces:N, \peek_charcode_remove_ignore_spaces:N,
%     \peek_meaning_ignore_spaces:N, \peek_meaning_remove_ignore_spaces:N
%   }
%    A little extra fun here to deal with the expansion.
%    \begin{macrocode}
\tl_map_inline:nn
  {
    { catcode } { catcode_remove }
    { charcode } { charcode_remove }
    { meaning } { meaning_remove }
  }
  {
    \use:e
      {
        \__kernel_patch_deprecation:nnNNpn { 2022-01-11 } { \peek_remove_spaces:n }
        \cs_gset_protected:Npn \exp_not:c { peek_ #1 _ignore_spaces:NTF } ##1##2##3
          {
            \peek_remove_spaces:n
              { \exp_not:c { peek_ #1 :NTF } ##1 {##2} {##3} }
          }
        \__kernel_patch_deprecation:nnNNpn { 2022-01-11 } { \peek_remove_spaces:n }
        \cs_gset_protected:Npn \exp_not:c { peek_ #1 _ignore_spaces:NT } ##1##2
          {
            \peek_remove_spaces:n
              { \exp_not:c { peek_ #1 :NT } ##1 {##2} }
          }
        \__kernel_patch_deprecation:nnNNpn { 2022-01-11 } { \peek_remove_spaces:n }
        \cs_gset_protected:Npn \exp_not:c { peek_ #1 _ignore_spaces:NF } ##1##2
          {
            \peek_remove_spaces:n
              { \exp_not:c { peek_ #1 :NF } ##1 {##2} }
          }
      }
  }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Deprecated \pkg{l3prop} functions}
%
% \begin{macro}[deprecated]
%   {
%     \prop_put_if_new:Nnn, \prop_put_if_new:NVn, \prop_put_if_new:NnV,
%     \prop_put_if_new:cnn, \prop_put_if_new:cVn, \prop_put_if_new:cnV,
%     \prop_gput_if_new:Nnn, \prop_gput_if_new:NVn, \prop_gput_if_new:NnV,
%     \prop_gput_if_new:cnn, \prop_gput_if_new:cVn, \prop_gput_if_new:cnV
%   }
%    \begin{macrocode}
%\__kernel_patch_deprecation:nnNNpn { 2024-03-30 } { \prop_put_if_not_in:Nnn }
\cs_new_protected:Npn \prop_put_if_new:Nnn { \prop_put_if_not_in:Nnn }
%\__kernel_patch_deprecation:nnNNpn { 2024-03-30 } { \prop_gput_if_not_in:Nnn }
\cs_new_protected:Npn \prop_gput_if_new:Nnn { \prop_gput_if_not_in:Nnn }
\cs_generate_variant:Nn \prop_put_if_new:Nnn
  { NnV , NV , c , cnV , cV }
\cs_generate_variant:Nn \prop_gput_if_new:Nnn
  { NnV , NV , c , cnV , cV }
%    \end{macrocode}
% \end{macro}
%
%    \begin{macrocode}
%</code>
%    \end{macrocode}
%
% \end{implementation}
%
% \PrintIndex
