% $Id$
% Public domain. Originally written by Karl Berry, 2021.
% Trivially test \tracingstacklevels (works with initex).
% (Run by hand; not included in the make check tests.)
% See tracingstacklevels.ch and the pdftex manual for more info.

\catcode`\{=1 \catcode`\}=2 \catcode`\#=6

%\tracingcommands=3 % more output if you want to see

\tracingmacros=2      % so macro expansion is logged at all
\tracingstacklevels=2 % cut off at level 2

\def\a#1{\relax}      % arguments since parameter logging is affected too
\def\b#1{\a{#1}}
\b1

% try \input, which counts as another level for this.
% The file expands \b again.
\input tracingstacklevel2

\end
