1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 use std::io::{File, Command};
12 use std::iter::repeat;
13 use std::rand::{thread_rng, Rng};
16 // creates a file with `fn main() { <random ident> }` and checks the
17 // compiler emits a span of the appropriate length (for the
18 // "unresolved name" message); currently just using the number of code
19 // points, but should be the number of graphemes (FIXME #7043)
21 fn random_char() -> char {
22 let mut rng = thread_rng();
23 // a subset of the XID_start Unicode table (ensuring that the
24 // compiler doesn't fail with an "unrecognised token" error)
25 let (lo, hi): (u32, u32) = match rng.gen_range(1u32, 4u32 + 1) {
28 3 => (0x1401, 0x166c),
29 _ => (0x10400, 0x1044f)
32 char::from_u32(rng.gen_range(lo, hi + 1)).unwrap()
36 let args = os::args();
37 let rustc = args[1].as_slice();
38 let tmpdir = Path::new(args[2].as_slice());
39 let main_file = tmpdir.join("span_main.rs");
41 for _ in range(0u, 100) {
42 let n = thread_rng().gen_range(3u, 20);
45 let _ = write!(&mut File::create(&main_file).unwrap(),
46 "#![feature(non_ascii_idents)] fn main() {{ {} }}",
47 // random string of length n
48 range(0, n).map(|_| random_char()).collect::<String>());
51 // rustc is passed to us with --out-dir and -L etc., so we
52 // can't exec it directly
53 let result = Command::new("sh")
58 .unwrap()).as_slice())
61 let err = String::from_utf8_lossy(result.error.as_slice());
63 // the span should end the line (e.g no extra ~'s)
64 let expected_span = format!("^{}\n", repeat("~").take(n - 1)
65 .collect::<String>());
66 assert!(err.as_slice().contains(expected_span.as_slice()));