// error-pattern:Unsatisfied precondition constraint (for example, same_length
use std;
import std::uint;
import std::u8;
import std::vec::*;

fn main() {
    let a = 'a' as u8, j = 'j' as u8, k = 1u, l = 10u;
    // Silly, but necessary
    check u8::le(a, j);
    check uint::le(k, l);
    let chars = enum_chars(a, j);
    let ints  = enum_uints(k, l);

    let ps = zip(chars, ints);
    fail "the impossible happened";
}