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create code fences with backticks ` or tildes ~
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like so
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\def\fi{}\iffalse. I can't post answers on this because it requires at least 10 rep earned from this site, but this will not allow output anymore too. \$\endgroup\$\fito its original meaning, right? Thus the language is not broken beyond any repair. \$\endgroup\$\fiis a TeX primitive. And no you can't redefine anything at this point,\iffalsehas been called. \$\endgroup\$\catcode13=9%would completely break the language (Everything after%is commented and newlines (ASCII char 13) are ignored, so the comment extends to infinity) I wanted to post it here. But you have a slightly longer command already in here. \$\endgroup\$