pub fn parse_qualified(key: &str) -> Option<(&str, &str)>Expand description
Split a project-qualified key "<project>::<key>" into (project, key),
or None if it carries no :: separator (a bare, within-repo key). A project
name never contains ::; a bare key may itself contain single colons (e.g.
sym:rust:…), so only the first double-colon separates the project
(ADR-0009).