{"ast_node_type":"other","tokens":[{"end":27,"kind":"keyword","start":0,"text":"if"}]}
        if !c.has_infer() {
    fn try_fold_const(&mut self, c: ty::Const<'tcx>) -> Result<ty::Const<'tcx>, Self::Error> {
            Ok(c) // micro-optimize -- if there is nothing in this const that this fold affects...