Function memory_id_in_other_namespace 

pub fn memory_id_in_other_namespace(
    id: i64,
    actual: &str,
    requested: &str,
) -> String

A memory id exists but is owned by a different namespace than the one asked for. Distinct from a plain miss: the row is there, the caller is not entitled to it, and naming both namespaces is what makes that actionable.