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// run-pass
use std::str;
pub fn main() {
// Chars of 1, 2, 3, and 4 bytes
let chs: Vec<char> = vec!['e', 'é', '€', '\u{10000}'];
let s: String = chs.iter().cloned().collect();
let schs: Vec<char> = s.chars().collect();
assert_eq!(s.len(), 10);
assert_eq!(s.chars().count(), 4);
assert_eq!(schs.len(), 4);
assert_eq!(schs.iter().cloned().collect::<String>(), s);
assert!((str::from_utf8(s.as_bytes()).is_ok()));
// invalid prefix
assert!((!str::from_utf8(&[0x80]).is_ok()));
// invalid 2 byte prefix
assert!((!str::from_utf8(&[0xc0]).is_ok()));
assert!((!str::from_utf8(&[0xc0, 0x10]).is_ok()));
// invalid 3 byte prefix
assert!((!str::from_utf8(&[0xe0]).is_ok()));
assert!((!str::from_utf8(&[0xe0, 0x10]).is_ok()));
assert!((!str::from_utf8(&[0xe0, 0xff, 0x10]).is_ok()));
// invalid 4 byte prefix
assert!((!str::from_utf8(&[0xf0]).is_ok()));
assert!((!str::from_utf8(&[0xf0, 0x10]).is_ok()));
assert!((!str::from_utf8(&[0xf0, 0xff, 0x10]).is_ok()));
assert!((!str::from_utf8(&[0xf0, 0xff, 0xff, 0x10]).is_ok()));
}
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