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template <typename ...Args>
void log_trace(std::ostream& out,
std::string const& prefix,
Args const& ...args)
{
out << prefix << "(";
hana::for_each(
hana::intersperse(hana::make_tuple(args...), ", "),
[&out](auto const& arg) { out << arg; });
out << ")\n";
}
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