[ratio.syn] Fix formatting of codeblock with digit separators.

Author: zygoloid

source/macros.tex

@@ -257,16 +257,21 @@
 % Our usual abbreviation for 'listings'.  Comments are in 
 % italics.  Arbitrary TeX commands can be used if they're 
 % surrounded by @ signs.
-\lstnewenvironment{codeblock}
-{
+\newcommand{\CodeBlockSetup}{
  \lstset{escapechar=@}
  \renewcommand{\tcode}[1]{\textup{\CodeStylex{##1}}}
  \renewcommand{\techterm}[1]{\textit{\CodeStylex{##1}}}
  \renewcommand{\term}[1]{\textit{##1}}
  \renewcommand{\grammarterm}[1]{\textit{##1}}
 }
-{
-}
+\lstnewenvironment{codeblock}{\CodeBlockSetup}{}
+
+% A code block in which single-quotes are digit separators
+% rather than character literals.
+\lstnewenvironment{codeblockdigitsep}{
+ \CodeBlockSetup
+ \lstset{deletestring=[b]{'}}
+}{}
 
 % Permit use of '@' inside codeblock blocks (don't ask)
 \makeatletter

source/utilities.tex

@@ -10276,7 +10276,7 @@
 
 \rSec2[ratio.syn]{Header \tcode{<ratio>} synopsis}
 
-\begin{codeblock}
+\begin{codeblockdigitsep}
 namespace std {
   // \ref{ratio.ratio}, class template \tcode{ratio}
   template <intmax_t N, intmax_t D = 1> class ratio;
@@ -10317,7 +10317,7 @@
   typedef ratio<    1'000'000'000'000'000'000'000, 1> zetta;  // \seebelow
   typedef ratio<1'000'000'000'000'000'000'000'000, 1> yotta;  // \seebelow
 }
-\end{codeblock}
+\end{codeblockdigitsep}
 
 \rSec2[ratio.ratio]{Class template \tcode{ratio}}