{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"debug_assert!(arg_list.syntax().text_range().contains(at));"}]}
    debug_assert!(arg_list.syntax().text_range().contains(at));
) -> Option<(hir::Callable<'db>, Option<usize>)> {
    let callable = arg_list.syntax().parent().and_then(ast::CallableExpr::cast)?;