3322595e89
signature. In a nutshell, the idea is to (1) report an error if, for a region pointer `'a T`, the lifetime `'a` is longer than any lifetimes that appear in `T` (in other words, if a borrowed pointer outlives any portion of its contents) and then (2) use this to assume that in a function like `fn(self: &'a &'b T)`, the relationship `'a <= 'b` holds. This is needed for #5656. Fixes #5728.
38 lines
997 B
Rust
38 lines
997 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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// xfail-test #5723
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// Test that you cannot escape a borrowed pointer
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// into a trait.
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struct ctxt { v: uint }
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trait get_ctxt {
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fn get_ctxt(&self) -> &'self ctxt;
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}
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struct has_ctxt<'self> { c: &'self ctxt }
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impl<'self> get_ctxt for has_ctxt<'self> {
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fn get_ctxt(&self) -> &'self ctxt { self.c }
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}
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fn make_gc() -> @get_ctxt {
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let ctxt = ctxt { v: 22u };
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let hc = has_ctxt { c: &ctxt };
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return @hc as @get_ctxt;
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//^~ ERROR source contains borrowed pointer
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}
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fn main() {
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make_gc().get_ctxt().v;
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}
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