You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: macos.rs
    path of file: ./repos/webbrowser-rs/src
    
    the code of the file until where you have to start completion: use crate::{Browser, BrowserOptions, Error, ErrorKind, Result, TargetType};
use core_foundation::array::{CFArray, CFArrayRef};
use core_foundation::base::TCFType;
use core_foundation::error::{CFError, CFErrorRef};
use core_foundation::url::{CFURLRef, CFURL};
use std::os::raw::c_void;

/// Deal with opening of browsers on Mac OS X using Core Foundat
    
    fn open_non_existing_browser() {
        let _ = env_logger::try_init();
        if let Err(err) = open_browser_internal(
            Browser::Opera,
            &TargetType::try_from("https://github.com").expect("failed to parse url"),
            &BrowserOptions::default(),
        ) {
            assert_eq!(err.kind(), ErrorKind::NotFound);
        } else {
            panic!("expected opening non-existing browser to fail");
        }
    }