101 lines
1.8 KiB
Rust
101 lines
1.8 KiB
Rust
#![feature(plugin)]
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#![plugin(clippy)]
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#![deny(map_clone)]
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#![allow(clone_on_copy, unused)]
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use std::ops::Deref;
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fn map_clone_iter() {
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let x = [1,2,3];
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x.iter().map(|y| y.clone());
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x.iter().map(|&y| y);
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x.iter().map(|y| *y);
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x.iter().map(|y| { y.clone() });
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x.iter().map(|&y| { y });
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x.iter().map(|y| { *y });
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x.iter().map(Clone::clone);
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}
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fn map_clone_option() {
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let x = Some(4);
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x.as_ref().map(|y| y.clone());
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x.as_ref().map(|&y| y);
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x.as_ref().map(|y| *y);
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}
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fn not_linted_option() {
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let x = Some(5);
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// Not linted: other statements
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x.as_ref().map(|y| {
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println!("y: {}", y);
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y.clone()
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});
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// Not linted: argument bindings
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let x = Some((6, 7));
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x.map(|(y, _)| y.clone());
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// Not linted: cloning something else
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x.map(|y| y.0.clone());
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// Not linted: no dereferences
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x.map(|y| y);
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// Not linted: multiple dereferences
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let _: Option<(i32, i32)> = x.as_ref().as_ref().map(|&&x| x);
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}
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#[derive(Copy, Clone)]
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struct Wrapper<T>(T);
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impl<T> Wrapper<T> {
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fn map<U, F: FnOnce(T) -> U>(self, f: F) -> Wrapper<U> {
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Wrapper(f(self.0))
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}
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}
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fn map_clone_other() {
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let eight = 8;
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let x = Wrapper(&eight);
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// Not linted: not a linted type
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x.map(|y| y.clone());
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x.map(|&y| y);
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x.map(|y| *y);
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}
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#[derive(Copy, Clone)]
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struct UnusualDeref;
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static NINE: i32 = 9;
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impl Deref for UnusualDeref {
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type Target = i32;
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fn deref(&self) -> &i32 { &NINE }
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}
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fn map_clone_deref() {
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let x = Some(UnusualDeref);
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let _: Option<UnusualDeref> = x.as_ref().map(|y| *y);
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// Not linted: using deref conversion
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let _: Option<i32> = x.map(|y| *y);
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// Not linted: using regular deref but also deref conversion
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let _: Option<i32> = x.as_ref().map(|y| **y);
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}
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fn main() { }
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