Build tabular content via \foreach

I am trying to build up tabular data using the solution at How do I use the ampersand (&) inside a foreach or conditional (or other group/environment) when building tables?, but not having any success.

There is some expansion issue that I am not able to figure out. I have counters which are declared based on the content of a list and I need to output the value of these counters in the output and hence trying to use \eAddTableTokens. The MWE below yields:

 Undefined control sequence.
\\  ->\let \reserved@e
\relax \let \reserved@f \relax \@ifstar {\let \reserv...
l.47 ^^I}


Code:

\documentclass{article}
\usepackage{tikz}

%% This is based on:
%%     https://tex.stackexchange.com/questions/165126
%%
\newcommand*{\MyTempTableTokens}{}%
\makeatletter
\newtoks\@tabtoks
%%% assignments to \@tabtoks must be global, because they are done in \foreach
\edef\MyTempTableTokens{#1}%
}
%%% variable should always be operated on always locally or always globally
\newcommand*\ResetTableTokens{\global\@tabtoks{}}
\newcommand*\PrintTableTokens{\the\@tabtoks}
\makeatother

\newcommand*{\MyList}{ABC, DE, FG}%

\begin{document}
% Confirm basic functionality
\ResetTableTokens%
\foreach \Entry in \MyList {%
}%
\begin{tabular}{ll}
\multicolumn{2}{c}{Basic Testing} \\
\PrintTableTokens
\end{tabular}%

%%% Processing:
%%%    Counters get declared and appropriate values are computed,
%%%    but for MWE these are all just a fixed number.
\foreach \Entry in \MyList {%
\newcounter{Count\Entry}%
\setcounter{Count\Entry}{77}%
}%
%%%
%%% Printing
\ResetTableTokens%
\foreach \Entry in \MyList {%
\edef\TempCountExpanded{\arabic{Count\Entry}}%
}%
\begin{tabular}{ll}
\multicolumn{2}{c}{Actual Use Case} \\
\PrintTableTokens
\end{tabular}%
\end{document}


Commands such as \\ or \textbf don't survive \edef; you need \protected@edef:
\newcommand\eAddTableTokens[1]{%

• Well, this certainly fixed it for the MWE. But, in my actual use case I had to eliminate the \\  in the call to \eAddTableTokens and instead add the \\  to definition of \eAddTableTokens. But, I am unable to determine what the actual difference between my actual use case and MWE is that could be causing this. – Peter Grill May 8 '14 at 0:25