52 lines
1.2 KiB
Rust
52 lines
1.2 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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struct point { x: isize, y: isize }
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trait methods {
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fn impurem(&self);
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fn blockm<F>(&self, f: F) where F: FnOnce();
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}
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impl methods for point {
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fn impurem(&self) {
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}
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fn blockm<F>(&self, f: F) where F: FnOnce() { f() }
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}
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fn a() {
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let mut p = point {x: 3, y: 4};
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// Here: it's ok to call even though receiver is mutable, because we
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// can loan it out.
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p.impurem();
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// But in this case we do not honor the loan:
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p.blockm(|| { //~ ERROR cannot borrow `p` as mutable
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p.x = 10;
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})
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}
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fn b() {
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let mut p = point {x: 3, y: 4};
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// Here I create an outstanding loan and check that we get conflicts:
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let l = &mut p;
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p.impurem(); //~ ERROR cannot borrow
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l.x += 1;
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}
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fn main() {
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}
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