Function resolve_name 

pub fn resolve_name<'a, I>(
    source: &str,
    node_name: &str,
    namespace: &str,
    remaps: I,
) -> Result<ResolvedName, ()>
where
    I: IntoIterator<Item = (&'a str, &'a str)>,

Resolve a source-level entity name through launch remap rules: expand the source name AND each rule’s from to fully-qualified form, compare exact, substitute the (also expanded) to of the first matching rule; no match → the expanded source name. A rule whose from/to fails to expand is skipped (never masks the name expansion itself).

This is the single-tier spelling: everything passed here is AUTHORITATIVE, and precedence among the rules is iterator order. When a caller has rules from more than one channel, it must say which channel outranks which — resolve_name_layered is that call, and it is the only place a precedence between channels may be expressed.