pub unsafe extern "C" fn RetractDriver(
arg1: *mut Environment,
arg2: *mut Fact,
arg3: bool,
arg4: *mut c_char,
) -> RetractErrorpub unsafe extern "C" fn RetractDriver(
arg1: *mut Environment,
arg2: *mut Fact,
arg3: bool,
arg4: *mut c_char,
) -> RetractError