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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//
// ignore-lexer-test FIXME #15679
use std::str;
pub fn main() {
// Chars of 1, 2, 3, and 4 bytes
let chs: Vec<char> = vec!('e', 'é', '€', '\U00010000');
let s: String = chs.iter().cloned().collect();
let schs: Vec<char> = s.chars().collect();
assert!(s.len() == 10u);
assert!(s.chars().count() == 4u);
assert!(schs.len() == 4u);
assert!(schs.iter().cloned().collect::<String>() == s);
assert!(s.char_at(0u) == 'e');
assert!(s.char_at(1u) == 'é');
assert!((str::from_utf8(s.as_bytes()).is_ok()));
// invalid prefix
assert!((!str::from_utf8(&[0x80_u8]).is_ok()));
// invalid 2 byte prefix
assert!((!str::from_utf8(&[0xc0_u8]).is_ok()));
assert!((!str::from_utf8(&[0xc0_u8, 0x10_u8]).is_ok()));
// invalid 3 byte prefix
assert!((!str::from_utf8(&[0xe0_u8]).is_ok()));
assert!((!str::from_utf8(&[0xe0_u8, 0x10_u8]).is_ok()));
assert!((!str::from_utf8(&[0xe0_u8, 0xff_u8, 0x10_u8]).is_ok()));
// invalid 4 byte prefix
assert!((!str::from_utf8(&[0xf0_u8]).is_ok()));
assert!((!str::from_utf8(&[0xf0_u8, 0x10_u8]).is_ok()));
assert!((!str::from_utf8(&[0xf0_u8, 0xff_u8, 0x10_u8]).is_ok()));
assert!((!str::from_utf8(&[0xf0_u8, 0xff_u8, 0xff_u8, 0x10_u8]).is_ok()));
}
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