41 lines
1.1 KiB
Rust
41 lines
1.1 KiB
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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#![feature(box_syntax)]
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struct ctxt { v: usize }
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trait get_ctxt {
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// Here the `&` is bound in the method definition:
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fn get_ctxt(&self) -> &ctxt;
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}
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struct has_ctxt<'a> { c: &'a ctxt }
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impl<'a> get_ctxt for has_ctxt<'a> {
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// Here an error occurs because we used `&self` but
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// the definition used `&`:
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fn get_ctxt(&self) -> &'a ctxt { //~ ERROR method not compatible with trait
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self.c
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}
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}
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fn get_v(gc: Box<get_ctxt>) -> usize {
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gc.get_ctxt().v
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}
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fn main() {
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let ctxt = ctxt { v: 22 };
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let hc = has_ctxt { c: &ctxt };
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assert_eq!(get_v(box hc as Box<get_ctxt>), 22);
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}
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