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// aux-build:option_helpers.rs
#![warn(clippy::all, clippy::pedantic)]
#![allow(
clippy::disallowed_names,
clippy::default_trait_access,
clippy::let_underscore_untyped,
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<T> {
_dummy: T,
}
impl<T> V<T> {
fn new() -> Option<V<T>> {
None
}
}
struct AsyncNew;
impl AsyncNew {
async fn new() -> Option<Self> {
None
}
}
struct BadNew;
impl BadNew {
fn new() -> i32 {
0
}
}
struct T;
impl Mul<T> 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();
}
|
