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+% \iffalse meta-comment
+%
+%% File: l3legacy.dtx
+%
+% Copyright (C) 2019 The LaTeX3 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 \textsf{l3legacy} package\\ Interfaces to legacy concepts^^A
+% }
+%
+% \author{^^A
+% The \LaTeX3 Project\thanks
+% {^^A
+% E-mail:
+% \href{mailto:latex-team@latex-project.org}
+% {latex-team@latex-project.org}^^A
+% }^^A
+% }
+%
+% \date{Released 2019-05-03}
+%
+% \maketitle
+%
+% \begin{documentation}
+%
+% There are a small number of \TeX{} or \LaTeXe{} concepts which are not used
+% in \pkg{expl3} code but which need to be manipulated when working as a \LaTeXe{}
+% package. To allow these to be integrated cleanly into \pkg{expl3} code, a set
+% of legacy interfaces are provided here.
+%
+% \begin{function}[EXP,pTF]{\legacy_if:n}
+% \begin{syntax}
+% \cs{legacy_if:nTF} \Arg{name} \Arg{true code} \Arg{false code}
+% \end{syntax}
+% Tests if the \LaTeXe{}/plain \TeX{} conditional (generated by \tn{newif})
+% if \texttt{true} or \texttt{false} and branches accordingly. The
+% \meta{name} of the conditional should \emph{omit} the leading \texttt{if}.
+% \end{function}
+%
+% \end{documentation}
+%
+% \begin{implementation}
+%
+% \section{\pkg{l3legacy} Implementation}
+%
+% \begin{macrocode}
+%<*package>
+% \end{macrocode}
+%
+% \begin{macrocode}
+%<@@=legacy>
+% \end{macrocode}
+%
+% \begin{macro}[EXP,pTF]{\legacy_if:n}
+% A friendly wrapper.
+% \begin{macrocode}
+\prg_new_conditional:Npnn \legacy_if:n #1 { p , T , F , TF }
+ {
+ \exp_args:Nc \if_meaning:w { if#1 } \iftrue
+ \prg_return_true:
+ \else:
+ \prg_return_false:
+ \fi:
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macrocode}
+%</package>
+% \end{macrocode}
+%
+% \end{implementation}
+%
+% \PrintIndex