Transform a tex source so that all macros are replaced by their definition
latex, tex
Solution
Write
\edef\xxx{Any text with any commands. For example, $\phantom x$.}
And then for output in the log-file
\show\xxx
or for output in your document
\meaning\xxx
Problem
Is it possible to see the output of the TeX ‘pre-processor’, i. e. the intermediate step before the actual output is done but with all user-defined macros replaced and only a subset of TeX primitives left? Or is there no such intermediate step?