pub unsafe extern "C" fn SUNLinSolSetATimes_PCG(
S: SUNLinearSolver,
A_data: *mut c_void,
ATimes: SUNATimesFn,
) -> SUNErrCodepub unsafe extern "C" fn SUNLinSolSetATimes_PCG(
S: SUNLinearSolver,
A_data: *mut c_void,
ATimes: SUNATimesFn,
) -> SUNErrCode