{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"//"}]}
    // Re-lower the AST item and get the source map.
fn use_tree_source_map(db: &dyn DefDatabase, use_ast_id: AstId<ast::Use>) -> Arena<ast::UseTree> {
    // Note: The AST unwraps are fine, since if they fail we should have never obtained `index`.