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cppdraft/depr/format/syn.md

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+[depr.format.syn]
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+# Annex D (normative) Compatibility features [[depr]](./#depr)
+
+## D.20 Deprecated formatting [[depr.format]](depr.format#syn)
+
+### D.20.1 Header <format> synopsis [depr.format.syn]
+
+[1](#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);}