54 lines
1.8 KiB
Rust
54 lines
1.8 KiB
Rust
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// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// This is a regression test for something that only came up while
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// attempting to bootstrap librustc with new destructor lifetime
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// semantics.
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use std::collections::HashMap;
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use std::cell::RefCell;
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// This version does not yet work (associated type issues)...
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#[cfg(cannot_use_this_yet)]
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fn foo<'a>(map: RefCell<HashMap<&'static str, &'a [u8]>>) {
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let one = [1u];
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assert_eq!(map.borrow().get("one"), Some(&one[]));
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}
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#[cfg(cannot_use_this_yet_either)]
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// ... and this version does not work (the lifetime of `one` is
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// supposed to match the lifetime `'a`) ...
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fn foo<'a>(map: RefCell<HashMap<&'static str, &'a [u8]>>) {
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let one = [1u];
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assert_eq!(map.borrow().get("one"), Some(&one.as_slice()));
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}
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#[cfg(all(not(cannot_use_this_yet),not(cannot_use_this_yet_either)))]
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fn foo<'a>(map: RefCell<HashMap<&'static str, &'a [u8]>>) {
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// ...so instead we walk through the trivial slice and make sure
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// it contains the element we expect.
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for (i, &x) in map.borrow().get("one").unwrap().iter().enumerate() {
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assert_eq!((i, x), (0, 1));
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}
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}
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fn main() {
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let zer = [0u8];
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let one = [1u8];
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let two = [2u8];
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let mut map = HashMap::new();
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map.insert("zero", &zer[]);
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map.insert("one", &one[]);
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map.insert("two", &two[]);
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let map = RefCell::new(map);
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foo(map);
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}
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