{"ast_node_type":"variable","tokens":[{"end":99,"kind":"keyword","start":0,"text":"let"}]}
        let mut all_crates = FxIndexSet::with_capacity_and_hasher(self.arena.len(), FxBuildHasher);
        // We use an `IndexSet` because the list needs to be topologically sorted.
        let mut visited = FxHashMap::default();