The definition path table contains *all* definitions, not just public
definitions.
// whichever `TyCtxt` is being used to decode those values.
pub root: schema::CrateRoot<'static>,
- /// For each public item in this crate, we encode a key. When the
+ /// For each definition in this crate, we encode a key. When the
/// crate is loaded, we read all the keys and put them in this
/// hashmap, which gives the reverse mapping. This allows us to
/// quickly retrace a `DefPath`, which is needed for incremental