{"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"///"}]}
    /// universe index of `TyVar(vid)`.
    /// If `TyVar(vid)` resolves to a type, return that type. Else, return the
    pub fn probe_ty_var(&self, vid: TyVid) -> Result<Ty<'tcx>, ty::UniverseIndex> {