pub unsafe extern "C" fn semq_diff_units_utf8(
diff: *const semq_diff_t,
id: *const u8,
len: u64,
units: *mut u32,
ref_symbols: *mut u8,
cand_symbols: *mut u8,
cap: u64,
count: *mut u64,
err: *mut semq_error_t,
) -> semq_status_t