{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"//"}]}
    // Transforms a ty:Ty for being encoded and used in the substitution dictionary.
impl<'tcx> TypeFolder<TyCtxt<'tcx>> for TransformTy<'tcx> {
    fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> {