9bd4e5469e
Boxes are a bit magic in that they need to use `*` to get an owned value
out of the box. They implement `Deref` but that only returns a
reference. This means an easy way to convert an `Option<Box<T>>` to an
`<Option<T>` is:
```
box_option.map(|b| *b)
```
However, since b36bb0a6 the `map_clone` lint is detecting this as an
attempt to copy the box. Fix by excluding boxes completely from the
deref part of this lint.
Fixes #3274
20 lines
829 B
Rust
20 lines
829 B
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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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(tool_lints)]
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#![warn(clippy::all, clippy::pedantic)]
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#![allow(clippy::missing_docs_in_private_items)]
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fn main() {
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let _: Vec<i8> = vec![5_i8; 6].iter().map(|x| *x).collect();
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let _: Vec<String> = vec![String::new()].iter().map(|x| x.clone()).collect();
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let _: Vec<u32> = vec![42, 43].iter().map(|&x| x).collect();
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let _: Option<u64> = Some(Box::new(16)).map(|b| *b);
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}
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