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// xfail-stage0
// xfail-stage1
// xfail-stage2
use std;
import std.Str;
import std.Vec;
import std.IO;
fn main() {
// Chars of 1, 2, 3, and 4 bytes
let vec[char] chs = vec('e', 'é', '€', 0x10000 as char);
let str s = Str.from_chars(chs);
assert (Str.byte_len(s) == 10u);
assert (Str.char_len(s) == 4u);
assert (Vec.len[char](Str.to_chars(s)) == 4u);
assert (Str.eq(Str.from_chars(Str.to_chars(s)), s));
assert (Str.char_at(s, 0u) == 'e');
assert (Str.char_at(s, 1u) == 'é');
assert (Str.is_utf8(Str.bytes(s)));
assert (!Str.is_utf8(vec(0x80_u8)));
assert (!Str.is_utf8(vec(0xc0_u8)));
assert (!Str.is_utf8(vec(0xc0_u8, 0x10_u8)));
auto stack = "a×c€";
assert (Str.pop_char(stack) == '€');
assert (Str.pop_char(stack) == 'c');
Str.push_char(stack, 'u');
assert (Str.eq(stack, "a×u"));
assert (Str.shift_char(stack) == 'a');
assert (Str.shift_char(stack) == '×');
Str.unshift_char(stack, 'ß');
assert (Str.eq(stack, "ßu"));
}
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