| HirId | Uniquely identifies a node in the HIR of the current crate. It is
composed of the owner, which is the LocalDefId of the directly enclosing
hir::Item, hir::TraitItem, or hir::ImplItem (i.e., the closest "item-like"),
and the local_id which is unique within the given owner.
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| ItemLocalId | An ItemLocalId uniquely identifies something within a given "item-like";
that is, within a hir::Item, hir::TraitItem, or hir::ImplItem. There is no
guarantee that the numerical value of a given ItemLocalId corresponds to
the node's position within the owning item in any way, but there is a
guarantee that the LocalItemIds within an owner occupy a dense range of
integers starting at zero, so a mapping that maps all or most nodes within
an "item-like" to something else can be implemented by a Vec instead of a
tree or hash map.
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