{"ast_node_type":"other","tokens":[{"end":27,"kind":"keyword","start":0,"text":"if"}]}
        if !t.has_infer() {
    fn try_fold_ty(&mut self, t: Ty<'tcx>) -> Result<Ty<'tcx>, Self::Error> {
            Ok(t) // micro-optimize -- if there is nothing in this type that this fold affects...