Incompatibility between etextools and etoolbox command \dolistloop (\forlistloop)?

Question

The following code uses the etoolbox package to convert a list a,b,c into an internal list (called \mylist) and then typesets that with colons: a:b:c:. However, when I load the etextools package (by uncommenting the second line), I get no list output.

\documentclass{minimal}
\usepackage{etoolbox}
%\usepackage{etextools}
\begin{document}
A list:
\def\mylist{}
\forcsvlist{\listadd\mylist}{a,b,c}
\def\do#1{#1:}
\dolistloop{\mylist}
\end{document}

I suspect it is is a bug since etextools claims to depend on etoolbox. Is this a bug or am I doing something wrong? In either case, how can I use \dolistloop with etextools (which I want for goodies like \expandnext)?

Notes

• \show\mylist produces the same output a|b|c| in both cases, so the problem is with \dolistloop which expands to \forlistloop\do
• The \forlistloop command becomes substantially more complicated when etextools is used.
• This question might be relevant (but not obviously).

Answer 1

This might be a bug in the etextools package. In fact, \forlistloop is currently redefined in a way incompatible with the etoolbox package. Hence, try:

\usepackage{etoolbox}
\let\origforlistloop\forlistloop
\usepackage{etextools}
\let\forlistloop\origforlistloop

Answer 2

If you are willing to use catoptions package, you can do

\documentclass{minimal}
%\usepackage{etoolbox} % you may load this if you like
%\usepackage{etextools} % load if you like
\usepackage{catoptions}

\begin{document}
% Add these elements to list container \mylist:
\docommalist{a,b,c}{\cptaddtolist\mylist{#1}}

% User callback for every item in \mylist. Don't print the last colon (:):
\def\mydo#1{#1\iflastindris\else:\fi}

% Do the looping over elements of \mylist. The star (*) form of \indrisloop expects
% a macro whose top level expansion contains the list items:
\indrisloop*\mylist\mydo
\end{document}