{"ast_node_type":"other","tokens":[{"end":156,"kind":"keyword","start":0,"text":"///"}]}
    /// If a `SourceRoot` doesn't have a parent and is local then it is not contained in this mapping but it can be asserted that it is a root `SourceRoot`.
    /// Maps local source roots to their parent source roots by bytewise comparing of root paths .
    pub fn source_root_parent_map(&self) -> FxHashMap<SourceRootId, SourceRootId> {