pub(crate) fn rdname_value(tags: &[String]) -> Option<&str>Expand description
The topic named by the tag list’s own @rdname tag, if it has one.
Class generators default every method onto the class page (@rdname <Class>); a method-level /// @rdname other splits it onto its own page.
Every emission path that injects the class default must consult this first
so a user-supplied topic is honoured once, not duplicated by the default.