{"ast_node_type":"variable","tokens":[{"end":66,"kind":"keyword","start":0,"text":"let"}]}
            let va_list_ptr_ty = Ty::new_mut_ptr(tcx, va_list_ty);
            let (va_list_ref_ty, va_list_ty) = mk_va_list_ty(hir::Mutability::Not);
            (0, 0, vec![va_list_ptr_ty, va_list_ref_ty], tcx.types.unit)