test::handler::handler

handler(
    boost::source_location loc = BOOST_CURRENT_LOCATION);
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explicit
handler(
    error_code ec,
    boost::source_location loc = BOOST_CURRENT_LOCATION);
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explicit
handler(
    boost::none_t,
    boost::source_location loc = BOOST_CURRENT_LOCATION);
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handler(
    handler&& other,
    boost::source_location loc = BOOST_CURRENT_LOCATION);
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