2b67d88809
needed. Regarding soundness: there was a subtle bug in how it was done before; see the compile-fail test for an example. Regarding reborrowing: reborrowing allows mut and const slices/borrowed-pointers to be used with pure fns that expect immutable data. r=brson
31 lines
1016 B
Rust
31 lines
1016 B
Rust
// Copyright 2012 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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trait repeat<A> { fn get() -> A; }
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impl<A:Copy> @A: repeat<A> {
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fn get() -> A { *self }
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}
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fn repeater<A:Copy>(v: @A) -> repeat<A> {
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// Note: owned kind is not necessary as A appears in the trait type
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v as repeat::<A> // No
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}
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fn main() {
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// Error results because the type of is inferred to be
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// repeat<&blk/int> where blk is the lifetime of the block below.
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let y = { //~ ERROR reference is not valid
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let x: &blk/int = &3;
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repeater(@x)
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};
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assert 3 == *(y.get()); //~ ERROR reference is not valid
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} |