6 // Chars of 1, 2, 3, and 4 bytes
7 let chs: Vec<char> = vec!['e', 'é', '€', '\u{10000}'];
8 let s: String = chs.iter().cloned().collect();
9 let schs: Vec<char> = s.chars().collect();
11 assert_eq!(s.len(), 10);
12 assert_eq!(s.chars().count(), 4);
13 assert_eq!(schs.len(), 4);
14 assert_eq!(schs.iter().cloned().collect::<String>(), s);
16 assert!((str::from_utf8(s.as_bytes()).is_ok()));
18 assert!((!str::from_utf8(&[0x80]).is_ok()));
19 // invalid 2 byte prefix
20 assert!((!str::from_utf8(&[0xc0]).is_ok()));
21 assert!((!str::from_utf8(&[0xc0, 0x10]).is_ok()));
22 // invalid 3 byte prefix
23 assert!((!str::from_utf8(&[0xe0]).is_ok()));
24 assert!((!str::from_utf8(&[0xe0, 0x10]).is_ok()));
25 assert!((!str::from_utf8(&[0xe0, 0xff, 0x10]).is_ok()));
26 // invalid 4 byte prefix
27 assert!((!str::from_utf8(&[0xf0]).is_ok()));
28 assert!((!str::from_utf8(&[0xf0, 0x10]).is_ok()));
29 assert!((!str::from_utf8(&[0xf0, 0xff, 0x10]).is_ok()));
30 assert!((!str::from_utf8(&[0xf0, 0xff, 0xff, 0x10]).is_ok()));