38 lines
995 B
Rust
38 lines
995 B
Rust
// 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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#![allow(dead_code)]
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use std::mem;
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enum Tag<A> {
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Tag2(A)
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}
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struct Rec {
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c8: u8,
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t: Tag<u64>
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}
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fn mk_rec() -> Rec {
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return Rec { c8:0, t:Tag::Tag2(0) };
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}
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fn is_u64_aligned(u: &Tag<u64>) -> bool {
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let p: usize = unsafe { mem::transmute(u) };
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let u64_align = std::mem::align_of::<u64>();
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return (p & (u64_align + 1)) == 0;
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}
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pub fn main() {
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let x = mk_rec();
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is_u64_aligned(&x.t); // the result of this is non-deterministic (even with a fixed seed, results vary between platforms)
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}
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