// aux-build:option_helpers.rs #![warn(clippy::all, clippy::pedantic)] #![allow( clippy::disallowed_name, clippy::default_trait_access, clippy::missing_docs_in_private_items, clippy::missing_safety_doc, clippy::non_ascii_literal, clippy::new_without_default, clippy::needless_pass_by_value, clippy::needless_lifetimes, clippy::print_stdout, clippy::must_use_candidate, clippy::use_self, clippy::useless_format, clippy::wrong_self_convention, clippy::unused_async, clippy::unused_self, unused )] #[macro_use] extern crate option_helpers; use std::collections::BTreeMap; use std::collections::HashMap; use std::collections::HashSet; use std::collections::VecDeque; use std::ops::Mul; use std::rc::{self, Rc}; use std::sync::{self, Arc}; use option_helpers::{IteratorFalsePositives, IteratorMethodFalsePositives}; struct Lt<'a> { foo: &'a u32, } impl<'a> Lt<'a> { // The lifetime is different, but that’s irrelevant; see issue #734. #[allow(clippy::needless_lifetimes)] pub fn new<'b>(s: &'b str) -> Lt<'b> { unimplemented!() } } struct Lt2<'a> { foo: &'a u32, } impl<'a> Lt2<'a> { // The lifetime is different, but that’s irrelevant; see issue #734. pub fn new(s: &str) -> Lt2 { unimplemented!() } } struct Lt3<'a> { foo: &'a u32, } impl<'a> Lt3<'a> { // The lifetime is different, but that’s irrelevant; see issue #734. pub fn new() -> Lt3<'static> { unimplemented!() } } #[derive(Clone, Copy)] struct U; impl U { fn new() -> Self { U } // Ok because `U` is `Copy`. fn to_something(self) -> u32 { 0 } } struct V { _dummy: T, } impl V { fn new() -> Option> { None } } struct AsyncNew; impl AsyncNew { async fn new() -> Option { None } } struct BadNew; impl BadNew { fn new() -> i32 { 0 } } struct T; impl Mul for T { type Output = T; // No error, obviously. fn mul(self, other: T) -> T { self } } /// Checks implementation of `FILTER_NEXT` lint. #[rustfmt::skip] fn filter_next() { let v = vec![3, 2, 1, 0, -1, -2, -3]; // Multi-line case. let _ = v.iter().filter(|&x| { *x < 0 } ).next(); // Check that we don't lint if the caller is not an `Iterator`. let foo = IteratorFalsePositives { foo: 0 }; let _ = foo.filter().next(); let foo = IteratorMethodFalsePositives {}; let _ = foo.filter(42).next(); } fn main() { filter_next(); }