> [...] '\.' is simply an another name for the dot (.)
>
> See chapter 7.5 with the definition (explanation) of ".de xy":
>
> ".." can be concealed as \\.. which will copy as \.. and reread as "..".
>
> Which means an unescaped "\." is read as ".".
So what about this:
\. The same as a dot (`.'). Necessary in nested macro
definitions so that `\\..' expands to `..'.
Werner
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