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Thanks a lot

It works almost

However, the last item saved in the box is replicated for every \argument

I suspect it is because the \edef is not expanded until \argdesc is expanded and at that time the box contains the last item.

Hi everybody

I am writing macros to help in the description of an API. I have one environment and one command
The command accumulate informations in a macro used by the closing part of the environment to display the informations in good order:

The environment is as follow :

\newenvironment ...