LWG3539 format_to must not copy models of output_iterator<const charT&>

Author: jensmaurer

source/utilities.tex

@@ -19949,7 +19949,7 @@
 Equivalent to:
 \begin{codeblock}
 using context = basic_format_context<Out, decltype(fmt)::value_type>;
-return vformat_to(out, fmt, make_format_args<context>(args...));
+return vformat_to(std::move(out), fmt, make_format_args<context>(args...));
 \end{codeblock}
 \end{itemdescr}
 
@@ -19967,7 +19967,7 @@
 Equivalent to:
 \begin{codeblock}
 using context = basic_format_context<Out, decltype(fmt)::value_type>;
-return vformat_to(out, loc, fmt, make_format_args<context>(args...));
+return vformat_to(std::move(out), loc, fmt, make_format_args<context>(args...));
 \end{codeblock}
 \end{itemdescr}