{"ast_node_type":"variable","tokens":[{"end":38,"kind":"keyword","start":0,"text":"let"}]}
        let mut instantiated = vec![];
    pub fn instantiate_identity(self, tcx: TyCtxt<'tcx>) -> Vec<(ty::PolyTraitRef<'tcx>, Span)> {
        self.instantiate_identity_into(tcx, &mut instantiated);