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3344: Added lints `into_iter_on_ref` and `into_iter_on_array`. r=phansch a=kennytm Fixes #1565. `into_iter_on_array` is a correctness lint against `into_iter()` on `[T; n]` and `PathBuf` (please provide a concise noun that covers both types 🙃). `into_iter_on_ref` is a style lint against `into_iter()` on `&C` where `C` is `[T]`, `Vec<T>`, `BTreeSet<T>` etc. Both suggests replacing the `into_iter()` with `iter()` or `iter_mut()`. `into_iter_on_array` is a correctness lint since it is very likely the standard library would provide an `into_iter()` method for `[T; n]` (rust-lang/rust#25725) and existing type inference of `[a, b, c].into_iter()` will be broken. `PathBuf` is also placed under this lint since `PathBuf::into_iter` currently doesn't exist and it makes some sense to implement `IntoIterator` on it yielding `OsString`s. Co-authored-by: kennytm <kennytm@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| #![warn(clippy::into_iter_on_ref)] | ||
| #![deny(clippy::into_iter_on_array)] | ||
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| struct X; | ||
| use std::collections::*; | ||
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| fn main() { | ||
| for _ in &[1,2,3] {} | ||
| for _ in vec![X, X] {} | ||
| for _ in &vec![X, X] {} | ||
| for _ in [1,2,3].into_iter() {} //~ ERROR equivalent to .iter() | ||
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| let _ = [1,2,3].into_iter(); //~ ERROR equivalent to .iter() | ||
| let _ = vec![1,2,3].into_iter(); | ||
| let _ = (&vec![1,2,3]).into_iter(); //~ WARN equivalent to .iter() | ||
| let _ = vec![1,2,3].into_boxed_slice().into_iter(); //~ WARN equivalent to .iter() | ||
| let _ = std::rc::Rc::from(&[X][..]).into_iter(); //~ WARN equivalent to .iter() | ||
| let _ = std::sync::Arc::from(&[X][..]).into_iter(); //~ WARN equivalent to .iter() | ||
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| let _ = (&&&&&&&[1,2,3]).into_iter(); //~ ERROR equivalent to .iter() | ||
| let _ = (&&&&mut &&&[1,2,3]).into_iter(); //~ ERROR equivalent to .iter() | ||
| let _ = (&mut &mut &mut [1,2,3]).into_iter(); //~ ERROR equivalent to .iter_mut() | ||
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| let _ = (&Some(4)).into_iter(); //~ WARN equivalent to .iter() | ||
| let _ = (&mut Some(5)).into_iter(); //~ WARN equivalent to .iter_mut() | ||
| let _ = (&Ok::<_, i32>(6)).into_iter(); //~ WARN equivalent to .iter() | ||
| let _ = (&mut Err::<i32, _>(7)).into_iter(); //~ WARN equivalent to .iter_mut() | ||
| let _ = (&Vec::<i32>::new()).into_iter(); //~ WARN equivalent to .iter() | ||
| let _ = (&mut Vec::<i32>::new()).into_iter(); //~ WARN equivalent to .iter_mut() | ||
| let _ = (&BTreeMap::<i32, u64>::new()).into_iter(); //~ WARN equivalent to .iter() | ||
| let _ = (&mut BTreeMap::<i32, u64>::new()).into_iter(); //~ WARN equivalent to .iter_mut() | ||
| let _ = (&VecDeque::<i32>::new()).into_iter(); //~ WARN equivalent to .iter() | ||
| let _ = (&mut VecDeque::<i32>::new()).into_iter(); //~ WARN equivalent to .iter_mut() | ||
| let _ = (&LinkedList::<i32>::new()).into_iter(); //~ WARN equivalent to .iter() | ||
| let _ = (&mut LinkedList::<i32>::new()).into_iter(); //~ WARN equivalent to .iter_mut() | ||
| let _ = (&HashMap::<i32, u64>::new()).into_iter(); //~ WARN equivalent to .iter() | ||
| let _ = (&mut HashMap::<i32, u64>::new()).into_iter(); //~ WARN equivalent to .iter_mut() | ||
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| let _ = (&BTreeSet::<i32>::new()).into_iter(); //~ WARN equivalent to .iter() | ||
| let _ = (&BinaryHeap::<i32>::new()).into_iter(); //~ WARN equivalent to .iter() | ||
| let _ = (&HashSet::<i32>::new()).into_iter(); //~ WARN equivalent to .iter() | ||
| let _ = std::path::Path::new("12/34").into_iter(); //~ WARN equivalent to .iter() | ||
| let _ = std::path::PathBuf::from("12/34").into_iter(); //~ ERROR equivalent to .iter() | ||
| } |
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