30 lines
990 B
Rust
30 lines
990 B
Rust
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// Copyright 2015 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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// Example taken from RFC 1238 text
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// https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md#examples-of-code-that-must-continue-to-work
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use std::cell::Cell;
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struct Concrete<'a>(u32, Cell<Option<&'a Concrete<'a>>>);
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struct Foo<T> { data: Vec<T> }
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fn main() {
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let mut foo = Foo { data: Vec::new() };
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foo.data.push(Concrete(0, Cell::new(None)));
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foo.data.push(Concrete(0, Cell::new(None)));
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foo.data[0].1.set(Some(&foo.data[1]));
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foo.data[1].1.set(Some(&foo.data[0]));
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}
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