Function pio_calc_bus_susceptance_matrix 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pio_calc_bus_susceptance_matrix(
    network: *const PioBalancedNetwork,
    formula: *const c_char,
    formula_len: usize,
    error: *mut *mut PioError,
) -> *mut PioSparseMatrix

Safety

Pointers and handles must satisfy the crate-level safety requirements.