Swap [diff.cpp20.strings] and [diff.cpp20.containers] for numerical clause order

Author: jensmaurer

source/compatibility.tex

@@ -819,30 +819,6 @@
 Valid \CppXX{} code that instantiated the removed specialization
 can become ill-formed.
 
-\rSec2[diff.cpp20.strings]{\ref*{strings}: strings library}
-
-\diffref{string.classes}
-\change
-Additional rvalue overload for the \tcode{substr} member function and
-the corresponding constructor.
-\rationale
-Improve efficiency of operations on rvalues.
-\effect
-Valid \CppXX{} code that created a substring
-by calling \tcode{substr} (or the corresponding constructor)
-on an xvalue expression with type \tcode{S}
-that is a specialization of \tcode{basic_string}
-may change meaning in this revision of \Cpp{}.
-\begin{example}
-\begin{codeblock}
-std::string s1 = "some long string that forces allocation", s2 = s1;
-std::move(s1).substr(10, 5);
-assert(s1 == s2);       // unspecified, previously guaranteed to be \tcode{true}
-std::string s3(std::move(s2), 10, 5);
-assert(s1 == s2);       // unspecified, previously guaranteed to be \tcode{true}
-\end{codeblock}
-\end{example}
-
 \rSec2[diff.cpp20.containers]{\ref*{containers}: containers library}
 
 \diffref{associative.reqmts,unord.req}
@@ -867,6 +843,30 @@
 \end{codeblock}
 \end{example}
 
+\rSec2[diff.cpp20.strings]{\ref*{strings}: strings library}
+
+\diffref{string.classes}
+\change
+Additional rvalue overload for the \tcode{substr} member function and
+the corresponding constructor.
+\rationale
+Improve efficiency of operations on rvalues.
+\effect
+Valid \CppXX{} code that created a substring
+by calling \tcode{substr} (or the corresponding constructor)
+on an xvalue expression with type \tcode{S}
+that is a specialization of \tcode{basic_string}
+may change meaning in this revision of \Cpp{}.
+\begin{example}
+\begin{codeblock}
+std::string s1 = "some long string that forces allocation", s2 = s1;
+std::move(s1).substr(10, 5);
+assert(s1 == s2);       // unspecified, previously guaranteed to be \tcode{true}
+std::string s3(std::move(s2), 10, 5);
+assert(s1 == s2);       // unspecified, previously guaranteed to be \tcode{true}
+\end{codeblock}
+\end{example}
+
 \rSec2[diff.cpp20.thread]{\ref*{thread}: concurrency support library}
 
 \diffref{thread.barrier}