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template <typename ...Names, typename ...Args>
void log_named_trace(
std::ostream& out,
std::string const& prefix,
hana::tuple<Names...> const& arg_names,
Args const& ...args)
out << prefix << "{";
out << hana::intersperse(zip_args(arg_names, hana::make_tuple(args...)), ", ");
out << "}\n";
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