29 lines
1019 B
Rust
29 lines
1019 B
Rust
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// Copyright 2016 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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// Issue 36278: On an unsized struct with >1 level of nontrivial
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// nesting, ensure we are computing dynamic size of prefix correctly.
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use std::mem;
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const SZ: usize = 100;
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struct P<T: ?Sized>([u8; SZ], T);
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type Ack<T> = P<P<T>>;
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fn main() {
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let size_of_sized; let size_of_unsized;
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let x: Box<Ack<[u8; 0]>> = Box::new(P([0; SZ], P([0; SZ], [0; 0])));
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size_of_sized = mem::size_of_val::<Ack<_>>(&x);
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let y: Box<Ack<[u8 ]>> = x;
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size_of_unsized = mem::size_of_val::<Ack<_>>(&y);
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assert_eq!(size_of_sized, size_of_unsized);
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}
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