9639cafd36
The pointer in the slice must not be null, because enum representations make that assumption. The `exchange_malloc` function returns a non-null sentinel for the zero size case, and it must not be passed to the `exchange_free` lang item. Since the length is always equal to the true capacity, a branch on the length is enough for most types. Slices of zero size types are statically special cased to never attempt deallocation. This is the same implementation as `Vec<T>`. Closes #14395
23 lines
712 B
Rust
23 lines
712 B
Rust
// Copyright 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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pub fn main() {
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assert!(Some(box() ()).is_some());
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let xs: Box<[()]> = box [];
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assert!(Some(xs).is_some());
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struct Foo;
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assert!(Some(box Foo).is_some());
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let ys: Box<[Foo]> = box [];
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assert!(Some(ys).is_some());
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}
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