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Rollup merge of rust-lang#22818 - pnkfelix:fsk-issue-22536, r=nikomat…
…sakis Ensure we do not zero when \"moving\" types that are Copy. Uses more precise `type_needs_drop` for deciding about emitting cleanup code. Added notes about the weaknesses regarding `ty::type_contents` here. Fix rust-lang#22536
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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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// Regression test for Issue #22536: If a type implements Copy, then | ||
// moving it must not zero the original memory. | ||
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trait Resources { | ||
type Buffer: Copy; | ||
fn foo(&self) {} | ||
} | ||
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struct BufferHandle<R: Resources> { | ||
raw: <R as Resources>::Buffer, | ||
} | ||
impl<R: Resources> Copy for BufferHandle<R> {} | ||
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enum Res {} | ||
impl Resources for Res { | ||
type Buffer = u32; | ||
} | ||
impl Copy for Res { } | ||
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fn main() { | ||
let b: BufferHandle<Res> = BufferHandle { raw: 1 }; | ||
let c = b; | ||
assert_eq!(c.raw, b.raw) | ||
} |