pub type IDALsPrecSolveFnBS = Option<unsafe extern "C" fn(tt: realtype, yy: N_Vector, yp: N_Vector, yyS: *mut N_Vector, ypS: *mut N_Vector, yyB: N_Vector, ypB: N_Vector, rrB: N_Vector, rvecB: N_Vector, zvecB: N_Vector, c_jB: realtype, deltaB: realtype, user_dataB: *mut c_void) -> c_int>;