Struct Opened 

pub struct Opened<'a> {
    pub store: String,
    pub source: &'a dyn ArraySource,
    pub context: PackageContext<'a>,
    pub cache: Option<&'a mut PackageCache>,
}

One package handed to compute_packages: the store id its objects are asked under (Asked::store), where they are read, what the face already knows of it, and - when the face keeps one - its cache.

Fields

store: String

The id Asked::store names it by (s1, s2, … in the front end).

source: &'a dyn ArraySource

Where its objects and arrays are read.

context: PackageContext<'a>

Its colour sets, index and colour resolver - the face’s own when it has them.

cache: Option<&'a mut PackageCache>

What it keeps between two calculations; None: nothing is kept.