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The standard FWEB notation for a short comment (one terminated by the next newline) is ‘// ...’. However, in FORTRAN the ‘//’ denotes concatenation by default. To make it denote a short comment, use the ‘-n/’ option. One can do this in the .fweb file (see CUSTOMIZATION) or with the language-setting command in limbo, as in ‘@n/’.
In FWEB, one may always use ‘\/’ for concatenation, so there’s no penalty for using ‘-n/’.