{"ast_node_type":"variable","tokens":[{"end":66,"kind":"keyword","start":0,"text":"let"}]}
        let process = |a: Ty<'tcx>, b: Ty<'tcx>| match *a.kind() {
        debug_assert!(!self.next_trait_solver());
            ty::Alias(ty::Opaque, ty::AliasTy { def_id, args, .. }) if def_id.is_local() => {