Function igraph_community_leading_eigenvector 

pub unsafe extern "C" fn igraph_community_leading_eigenvector(
    graph: *const igraph_t,
    weights: *const igraph_vector_t,
    merges: *mut igraph_matrix_int_t,
    membership: *mut igraph_vector_int_t,
    steps: igraph_int_t,
    options: *mut igraph_arpack_options_t,
    modularity: *mut igraph_real_t,
    start: igraph_bool_t,
    eigenvalues: *mut igraph_vector_t,
    eigenvectors: *mut igraph_vector_list_t,
    history: *mut igraph_vector_int_t,
    callback: igraph_community_leading_eigenvector_callback_t,
    callback_extra: *mut c_void,
) -> igraph_error_t