{"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"//"}]}
                // `extern` declarations and `#[track_caller]` would alter their ABI.
                // `#[track_caller]` is not valid on weak lang items because they are called via
                if let Some((lang_item, _)) = hir::lang_items::extract(attrs)