rust/src/test/compile-fail/issue-3888.rs
2013-01-20 19:51:33 -08:00

43 lines
1.2 KiB
Rust

// 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.
// n.b. This should be a run-pass test, but for now I'm testing
// that we don't see an "unknown scope" error.
fn vec_peek<T>(v: &r/[T]) -> Option< (&r/T, &r/[T]) > {
if v.len() == 0 {
None
} else {
let vec_len = v.len();
let head = &v[0];
// note: this *shouldn't* be an illegal borrow! See #3888
let tail = v.view(1, vec_len); //~ ERROR illegal borrow: borrowed value does not live long enough
Some( (head, tail) )
}
}
fn test_peek_empty_stack() {
let v : &[int] = &[];
assert (None == vec_peek(v));
}
fn test_peek_empty_unique() {
let v : ~[int] = ~[];
assert (None == vec_peek(v));
}
fn test_peek_empty_managed() {
let v : @[int] = @[];
assert (None == vec_peek(v));
}
fn main() {}