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-T%: Don't retain trailing comments (TeX)

Unless the -v option is used, comments are generally deleted by FTANGLE as it writes the output file. However, in the TeX language such deletions can change the behavior of the output (by introducing extra spaces). Therefore, TeX comments that do not begin a line are always retained unless the -T% option is used. This option has no effect for languages other than TeX. -T#

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-T#: Don't insert #line command after @%

If the @% command (see AT%) is used to comment out a line, it eats the trailing newline. An undesirable consequence of this is that, if nothing is done, the subsequent line numbering will be misunderstood by a debugger, at least until FWEB inserts a #line command for some reason. To prevent this, FWEB inserts by default an implicit @#line command (see Preprocessing) after each @% that begins a line. To prevent this from happening (possibly because the feature doesn't work correctly, in which case you should report it; see Support), use the -T# option.