57 lines
1.5 KiB
Rust
57 lines
1.5 KiB
Rust
// aux-build:option_helpers.rs
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#![warn(clippy::iter_nth)]
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#[macro_use]
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extern crate option_helpers;
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use option_helpers::IteratorFalsePositives;
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use std::collections::VecDeque;
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/// Struct to generate false positives for things with `.iter()`.
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#[derive(Copy, Clone)]
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struct HasIter;
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impl HasIter {
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fn iter(self) -> IteratorFalsePositives {
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IteratorFalsePositives { foo: 0 }
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}
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fn iter_mut(self) -> IteratorFalsePositives {
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IteratorFalsePositives { foo: 0 }
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}
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}
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/// Checks implementation of `ITER_NTH` lint.
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fn iter_nth() {
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let mut some_vec = vec![0, 1, 2, 3];
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let mut boxed_slice: Box<[u8]> = Box::new([0, 1, 2, 3]);
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let mut some_vec_deque: VecDeque<_> = some_vec.iter().cloned().collect();
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{
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// Make sure we lint `.iter()` for relevant types.
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let bad_vec = some_vec.iter().nth(3);
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let bad_slice = &some_vec[..].iter().nth(3);
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let bad_boxed_slice = boxed_slice.iter().nth(3);
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let bad_vec_deque = some_vec_deque.iter().nth(3);
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}
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{
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// Make sure we lint `.iter_mut()` for relevant types.
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let bad_vec = some_vec.iter_mut().nth(3);
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}
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{
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let bad_slice = &some_vec[..].iter_mut().nth(3);
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}
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{
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let bad_vec_deque = some_vec_deque.iter_mut().nth(3);
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}
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// Make sure we don't lint for non-relevant types.
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let false_positive = HasIter;
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let ok = false_positive.iter().nth(3);
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let ok_mut = false_positive.iter_mut().nth(3);
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}
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fn main() {}
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