{"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
        let generics = self.tcx.generics_of(self.body_id);
    fn point_at_param_definition(&self, err: &mut Diag<'_>, param: ty::ParamTy) {
        let generic_param = generics.type_param(param, self.tcx);