41 lines
1.2 KiB
Rust
41 lines
1.2 KiB
Rust
// Copyright 2014 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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use std::cell::RefCell;
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// FIXME (#22405): Replace `Box::new` with `box` here when/if possible.
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fn main() {
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let mut y = 1;
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let c = RefCell::new(vec![]);
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c.push(Box::new(|| y = 0));
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c.push(Box::new(|| y = 0));
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//~^ ERROR cannot borrow `y` as mutable more than once at a time
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}
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fn ufcs() {
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let mut y = 1;
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let c = RefCell::new(vec![]);
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Push::push(&c, Box::new(|| y = 0));
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Push::push(&c, Box::new(|| y = 0));
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//~^ ERROR cannot borrow `y` as mutable more than once at a time
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}
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trait Push<'c> {
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fn push<'f: 'c>(&self, push: Box<FnMut() + 'f>);
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}
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impl<'c> Push<'c> for RefCell<Vec<Box<FnMut() + 'c>>> {
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fn push<'f: 'c>(&self, fun: Box<FnMut() + 'f>) {
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self.borrow_mut().push(fun)
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}
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}
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