pub unsafe extern "C" fn ffi_prep_closure_loc(
arg1: *mut ffi_closure,
arg2: *mut ffi_cif,
fun: Option<unsafe extern "C" fn(*mut ffi_cif, *mut c_void, *mut *mut c_void, *mut c_void)>,
user_data: *mut c_void,
codeloc: *mut c_void,
) -> u32