pub unsafe extern "C" fn onig_set_callout_of_name(
enc: OnigEncoding,
type_: OnigCalloutType,
name: *mut OnigUChar,
name_end: *mut OnigUChar,
callout_in: c_int,
callout: OnigCalloutFunc,
end_callout: OnigCalloutFunc,
arg_num: c_int,
arg_types: *mut c_uint,
optional_arg_num: c_int,
opt_defaults: *mut OnigValue,
) -> c_int