68 lines
1.7 KiB
Rust
68 lines
1.7 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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// Ensure that invoking a closure counts as a unique immutable borrow
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type Fn<'a> = Box<FnMut() + 'a>;
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struct Test<'a> {
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f: Box<FnMut() + 'a>
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}
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// FIXME (#22405): Replace `Box::new` with `box` here when/if possible.
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fn call<F>(mut f: F) where F: FnMut(Fn) {
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f(Box::new(|| {
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//~^ ERROR: cannot borrow `f` as mutable more than once
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f((Box::new(|| {})))
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}));
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}
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fn test1() {
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call(|mut a| {
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a.call_mut(());
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});
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}
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fn test2<F>(f: &F) where F: FnMut() {
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(*f)(); //~ ERROR: cannot borrow immutable borrowed content `*f` as mutable
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}
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fn test3<F>(f: &mut F) where F: FnMut() {
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(*f)();
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}
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fn test4(f: &Test) {
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f.f.call_mut(()) //~ ERROR: cannot borrow immutable `Box` content `*f.f` as mutable
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}
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fn test5(f: &mut Test) {
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f.f.call_mut(())
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}
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fn test6() {
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let mut f = || {};
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(|| {
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f();
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})();
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}
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fn test7() {
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fn foo<F>(_: F) where F: FnMut(Box<FnMut(isize)>, isize) {}
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let mut f = |g: Box<FnMut(isize)>, b: isize| {};
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// FIXME (#22405): Replace `Box::new` with `box` here when/if possible.
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f(Box::new(|a| {
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foo(f);
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//~^ ERROR cannot move `f` into closure because it is borrowed
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//~| ERROR cannot move out of captured outer variable in an `FnMut` closure
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}), 3);
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}
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fn main() {}
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