pub unsafe extern "C" fn krb5_set_trace_callback(
context: krb5_context,
fn_: Option<krb5_trace_callback>,
cb_data: *mut c_void,
) -> krb5_error_codepub unsafe extern "C" fn krb5_set_trace_callback(
context: krb5_context,
fn_: Option<krb5_trace_callback>,
cb_data: *mut c_void,
) -> krb5_error_code