Function throne::throne_context_find_matching_rules

#[no_mangle]
pub extern "C" fn throne_context_find_matching_rules(
    context: *mut Context, 
    side_input: extern "C" fn(p: *const Atom, p_len: usize, data: *mut c_void) -> bool, 
    side_input_data: *mut c_void, 
    result_ptr: *mut CRule, 
    result_len: usize
) -> usize