[texhax] letterspace problem

[Philip & Le Khanh]

In fact, there's a comment in the source which explains
exactly what is needed :

> The |\@nd| terminates the parameter list, and the |{}| which immediately
> precedes it ensures that that there is always a null element at the end of the
> list: without this, the braces which are needed to protect an accent/character
> pair would be lost if such a pair formed the final element of the list, at the
> point where they are passed as the second (delimited) parameter to |\p at rtiti@n|;

Philip Taylor