{"ast_node_type":"variable","tokens":[{"end":80,"kind":"keyword","start":0,"text":"if"}]}
        if let hir::ExprKind::Path(hir::QPath::Resolved(None, path)) = expr.kind
        // i.e. changing `Default::default()` to `<() as Default>::default()`.
            && let Res::Def(DefKind::AssocFn, def_id) = path.res