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+[depr.format]
+
+# Annex D (normative) Compatibility features [[depr]](./#depr)
+
+## D.20 Deprecated formatting [depr.format]
+
+### [D.20.1](#syn) Header <format> synopsis [[depr.format.syn]](depr.format.syn)
+
+[1](#syn-1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/future.tex#L750)
+
+The header [<format>](format.formatter.spec#header:%3cformat%3e "28.5.6.4 Formatter specializations [format.formatter.spec]") has the following additions:
+
+namespace std {template<class Visitor, class Context>decltype(auto) visit_format_arg(Visitor&& vis, basic_format_arg<Context> arg);}
+
+### [D.20.2](#arg) Formatting arguments [[depr.format.arg]](depr.format.arg)
+
+[ð](#lib:visit_format_arg)
+
+`template<class Visitor, class Context>
+  decltype(auto) visit_format_arg(Visitor&& vis, basic_format_arg<Context> arg);
+`
+
+[1](#arg-1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/future.tex#L769)
+
+*Effects*: Equivalent to: return visit(std::forward<Visitor>(vis), arg.value);