0d5bcb14ad
Many of the modifications putting in `Box::new` calls also include a pointer to Issue 22405, which tracks going back to `box <expr>` if possible in the future. (Still tried to use `Box<_>` where it sufficed; thus some tests still have `box_syntax` enabled, as they use a mix of `box` and `Box::new`.) Precursor for overloaded-`box` and placement-`in`; see Issue 22181.
33 lines
1012 B
Rust
33 lines
1012 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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// FIXME (#22405): Replace `Box::new` with `box` here when/if possible.
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fn ignore<T>(t: T) {}
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fn nested<'x>(x: &'x isize) {
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let y = 3;
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let mut ay = &y;
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ignore::<Box<for<'z> FnMut(&'z isize)>>(Box::new(|z| {
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ay = x; //~ ERROR cannot infer
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ay = &y;
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ay = z;
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}));
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ignore::< Box<for<'z> FnMut(&'z isize) -> &'z isize>>(Box::new(|z| {
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if false { return x; } //~ ERROR cannot infer an appropriate lifetime for automatic
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if false { return ay; }
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return z;
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}));
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}
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fn main() {}
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