ae0216d557
Follow up https://github.com/rust-lang/rust/pull/96861. This PR uses the traits added to the Rust 2021 Edition prelude. > The `TryInto`, `TryFrom` and `FromIterator` traits are now part of the prelude. https://doc.rust-lang.org/edition-guide/rust-2021/prelude.html
140 lines
2.6 KiB
Rust
140 lines
2.6 KiB
Rust
// aux-build:option_helpers.rs
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#![warn(clippy::all, clippy::pedantic)]
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#![allow(
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clippy::blacklisted_name,
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clippy::default_trait_access,
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clippy::missing_docs_in_private_items,
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clippy::missing_safety_doc,
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clippy::non_ascii_literal,
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clippy::new_without_default,
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clippy::needless_pass_by_value,
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clippy::needless_lifetimes,
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clippy::print_stdout,
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clippy::must_use_candidate,
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clippy::use_self,
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clippy::useless_format,
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clippy::wrong_self_convention,
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clippy::unused_self,
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unused
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)]
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#[macro_use]
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extern crate option_helpers;
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use std::collections::BTreeMap;
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use std::collections::HashMap;
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use std::collections::HashSet;
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use std::collections::VecDeque;
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use std::ops::Mul;
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use std::rc::{self, Rc};
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use std::sync::{self, Arc};
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use option_helpers::{IteratorFalsePositives, IteratorMethodFalsePositives};
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struct Lt<'a> {
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foo: &'a u32,
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}
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impl<'a> Lt<'a> {
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// The lifetime is different, but that’s irrelevant; see issue #734.
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#[allow(clippy::needless_lifetimes)]
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pub fn new<'b>(s: &'b str) -> Lt<'b> {
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unimplemented!()
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}
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}
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struct Lt2<'a> {
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foo: &'a u32,
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}
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impl<'a> Lt2<'a> {
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// The lifetime is different, but that’s irrelevant; see issue #734.
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pub fn new(s: &str) -> Lt2 {
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unimplemented!()
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}
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}
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struct Lt3<'a> {
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foo: &'a u32,
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}
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impl<'a> Lt3<'a> {
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// The lifetime is different, but that’s irrelevant; see issue #734.
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pub fn new() -> Lt3<'static> {
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unimplemented!()
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}
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}
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#[derive(Clone, Copy)]
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struct U;
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impl U {
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fn new() -> Self {
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U
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}
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// Ok because `U` is `Copy`.
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fn to_something(self) -> u32 {
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0
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}
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}
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struct V<T> {
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_dummy: T,
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}
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impl<T> V<T> {
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fn new() -> Option<V<T>> {
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None
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}
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}
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struct AsyncNew;
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impl AsyncNew {
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async fn new() -> Option<Self> {
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None
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}
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}
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struct BadNew;
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impl BadNew {
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fn new() -> i32 {
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0
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}
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}
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struct T;
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impl Mul<T> for T {
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type Output = T;
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// No error, obviously.
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fn mul(self, other: T) -> T {
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self
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}
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}
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/// Checks implementation of `FILTER_NEXT` lint.
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#[rustfmt::skip]
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fn filter_next() {
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let v = vec![3, 2, 1, 0, -1, -2, -3];
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// Multi-line case.
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let _ = v.iter().filter(|&x| {
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*x < 0
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}
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).next();
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// Check that we don't lint if the caller is not an `Iterator`.
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let foo = IteratorFalsePositives { foo: 0 };
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let _ = foo.filter().next();
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let foo = IteratorMethodFalsePositives {};
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let _ = foo.filter(42).next();
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}
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fn main() {
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filter_next();
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}
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