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[lex.comment] Add a note that comments are replaced by a single space #8414

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[lex.comment] Add a note that comments are replaced by a single space #8414

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6 changes: 6 additions & 0 deletions source/lex.tex
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Expand Up @@ -525,6 +525,12 @@
characters \tcode{//} and \tcode{/*} have no special meaning within a
\tcode{/*} comment.
\end{note}
\begin{note}
Comments are turned into \unicode{0020}{space} characters in
phase 3 of translation as part of decomposing a source file into
preprocessing tokens and sequences of whitespace characters.
Comment on lines +529 to +531
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@jensmaurer jensmaurer Nov 5, 2025

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lex.phases p3 says a bit much in that location.

Maybe it's better to move the normative provision "Each comment (5.4) is replaced by one u+0020 space character." here or into lex.pptoken, possibly as part of the "whitespace grammar" paper.

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@AlisdairM AlisdairM Dec 6, 2025

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I was reluctant to touch the phases of translation more than necessary in P3657, the whitespace grammar paper. However, if we prefer that direction I will updated the next revision of that paper and close this PR.

\end{note}

\indextext{comment|)}

\rSec1[lex.pptoken]{Preprocessing tokens}
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