Struct Section 

pub struct Section<'a> {
    pub group: &'a Group,
    pub relevant: bool,
    pub fields: Vec<&'a Field>,
    pub groups: Vec<Section<'a>>,
}

One group with the fields it names, resolved against a body — what a caller draws.

Fields

group: &'a Group

relevant: bool

Whether the instrument is using these controls: this group’s own condition and every ancestor’s. Group::is_relevant on group answers for this level alone, where a caller wants to tell “the section is off” from “this cluster is not the selected one”.

fields: Vec<&'a Field>

This group’s own fields, in reading order, prefix.* expanded.

groups: Vec<Section<'a>>

The nested groups, resolved the same way.