{"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"if"}]}
            if let ty::Param(param) = expected_ty.kind()
            let owner = self.tcx.hir_enclosing_body_owner(expr.hir_id);
                && let Some(generics) = self.tcx.hir_get_generics(owner)