2019-01-02 22:48:44 +01:00
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// aux-build:option_helpers.rs
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2020-03-10 22:35:07 +01:00
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// edition:2018
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2019-01-02 22:48:44 +01:00
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2019-10-16 19:43:26 +02:00
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#![warn(clippy::all, clippy::pedantic)]
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2018-12-08 18:56:59 +01:00
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#![allow(
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clippy::blacklisted_name,
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2019-09-18 08:37:41 +02:00
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clippy::default_trait_access,
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clippy::missing_docs_in_private_items,
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2020-04-08 12:57:58 +02:00
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clippy::missing_safety_doc,
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2018-12-08 18:56:59 +01:00
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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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2019-09-18 08:37:41 +02:00
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clippy::print_stdout,
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clippy::must_use_candidate,
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2018-12-08 18:56:59 +01:00
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clippy::use_self,
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2019-08-01 06:54:57 +02:00
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clippy::useless_format,
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2019-09-18 08:37:41 +02:00
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clippy::wrong_self_convention,
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2019-10-04 19:18:52 +02:00
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clippy::unused_self,
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2019-09-18 08:37:41 +02:00
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unused
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2018-12-08 18:56:59 +01:00
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)]
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2017-02-07 21:05:30 +01:00
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2019-01-02 22:48:44 +01:00
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#[macro_use]
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extern crate option_helpers;
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2017-02-07 21:05:30 +01:00
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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::iter::FromIterator;
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2019-02-22 07:05:21 +01:00
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use std::ops::Mul;
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2017-09-10 03:51:54 +02:00
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use std::rc::{self, Rc};
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use std::sync::{self, Arc};
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2017-02-07 21:05:30 +01:00
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2019-01-02 22:48:44 +01:00
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use option_helpers::IteratorFalsePositives;
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2019-01-02 07:23:00 +01:00
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2017-11-03 05:54:35 +01:00
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pub struct T;
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2017-02-07 21:05:30 +01:00
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impl T {
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2019-02-22 07:05:21 +01:00
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pub fn add(self, other: T) -> T {
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self
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}
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// no error, not public interface
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pub(crate) fn drop(&mut self) {}
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2017-10-21 13:53:57 +02:00
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2019-02-22 07:05:21 +01:00
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// no error, private function
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fn neg(self) -> Self {
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self
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}
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// no error, private function
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fn eq(&self, other: T) -> bool {
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true
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}
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2017-02-07 21:05:30 +01:00
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2019-01-31 02:15:29 +01:00
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// No error; self is a ref.
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2019-02-22 07:05:21 +01:00
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fn sub(&self, other: T) -> &T {
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self
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}
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2019-01-31 02:15:29 +01:00
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// No error; different number of arguments.
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2019-02-22 07:05:21 +01:00
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fn div(self) -> T {
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self
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}
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2019-01-31 02:15:29 +01:00
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// No error; wrong return type.
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fn rem(self, other: T) {}
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2019-02-22 07:05:21 +01:00
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2019-01-31 02:15:29 +01:00
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// Fine
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2019-02-22 07:05:21 +01:00
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fn into_u32(self) -> u32 {
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0
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}
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2017-02-07 21:05:30 +01:00
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2019-02-22 07:05:21 +01:00
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fn into_u16(&self) -> u16 {
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0
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}
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2017-02-07 21:05:30 +01:00
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2019-02-22 07:05:21 +01:00
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fn to_something(self) -> u32 {
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0
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}
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2017-02-07 21:05:30 +01:00
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2019-02-22 07:05:21 +01:00
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fn new(self) -> Self {
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unimplemented!();
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}
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2017-02-07 21:05:30 +01:00
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}
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2020-04-08 12:57:58 +02:00
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pub struct T1;
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impl T1 {
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// Shouldn't trigger lint as it is unsafe.
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pub unsafe fn add(self, rhs: T1) -> T1 {
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self
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}
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// Should not trigger lint since this is an async function.
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pub async fn next(&mut self) -> Option<T1> {
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None
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}
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}
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2017-02-07 21:05:30 +01:00
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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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2019-01-31 02:15:29 +01:00
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// The lifetime is different, but that’s irrelevant; see issue #734.
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2018-07-28 17:34:52 +02:00
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#[allow(clippy::needless_lifetimes)]
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2019-02-22 07:05:21 +01:00
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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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2017-02-07 21:05:30 +01:00
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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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2019-01-31 02:15:29 +01:00
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// The lifetime is different, but that’s irrelevant; see issue #734.
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2019-02-22 07:05:21 +01:00
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pub fn new(s: &str) -> Lt2 {
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unimplemented!()
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}
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2017-02-07 21:05:30 +01:00
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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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2019-01-31 02:15:29 +01:00
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// The lifetime is different, but that’s irrelevant; see issue #734.
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2019-02-22 07:05:21 +01:00
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pub fn new() -> Lt3<'static> {
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unimplemented!()
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}
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2017-02-07 21:05:30 +01:00
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}
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2019-02-22 07:05:21 +01:00
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#[derive(Clone, Copy)]
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2017-02-07 21:05:30 +01:00
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struct U;
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impl U {
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2019-02-22 07:05:21 +01:00
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fn new() -> Self {
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U
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}
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2019-01-31 02:15:29 +01:00
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// Ok because `U` is `Copy`.
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2019-02-22 07:05:21 +01:00
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fn to_something(self) -> u32 {
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0
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}
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2017-02-07 21:05:30 +01:00
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}
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struct V<T> {
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2019-02-22 07:05:21 +01:00
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_dummy: T,
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2017-02-07 21:05:30 +01:00
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}
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impl<T> V<T> {
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2019-02-22 07:05:21 +01:00
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fn new() -> Option<V<T>> {
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None
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}
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2017-02-07 21:05:30 +01:00
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}
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2019-08-09 17:44:05 +02:00
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struct AsyncNew;
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impl AsyncNew {
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2019-08-09 19:19:49 +02:00
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async fn new() -> Option<Self> {
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None
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2019-08-09 17:44:05 +02:00
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}
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}
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2019-08-09 23:15:49 +02:00
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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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2017-02-07 21:05:30 +01:00
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impl Mul<T> for T {
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type Output = T;
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2019-01-31 02:15:29 +01:00
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// No error, obviously.
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2019-02-22 07:05:21 +01:00
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fn mul(self, other: T) -> T {
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self
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}
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2017-02-07 21:05:30 +01:00
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}
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2019-01-31 02:15:29 +01:00
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/// Checks implementation of `FILTER_NEXT` lint.
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2019-02-22 06:49:17 +01:00
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#[rustfmt::skip]
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2017-02-07 21:05:30 +01:00
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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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2019-01-31 02:15:29 +01:00
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// Single-line case.
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2017-02-07 21:05:30 +01:00
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let _ = v.iter().filter(|&x| *x < 0).next();
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2017-02-08 14:58:07 +01:00
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2019-01-31 02:15:29 +01:00
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// Multi-line case.
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2017-02-08 14:58:07 +01:00
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let _ = v.iter().filter(|&x| {
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2017-02-07 21:05:30 +01:00
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*x < 0
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}
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).next();
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2019-01-31 02:15:29 +01:00
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// Check that hat we don't lint if the caller is not an `Iterator`.
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2017-02-07 21:05:30 +01:00
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let foo = IteratorFalsePositives { foo: 0 };
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let _ = foo.filter().next();
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}
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2019-01-31 02:15:29 +01:00
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/// Checks implementation of `SEARCH_IS_SOME` lint.
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2019-02-22 06:49:17 +01:00
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#[rustfmt::skip]
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2017-02-07 21:05:30 +01:00
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fn search_is_some() {
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let v = vec![3, 2, 1, 0, -1, -2, -3];
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2019-08-26 12:50:15 +02:00
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let y = &&42;
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2017-02-07 21:05:30 +01:00
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2019-01-31 02:15:29 +01:00
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// Check `find().is_some()`, single-line case.
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2017-02-07 21:05:30 +01:00
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let _ = v.iter().find(|&x| *x < 0).is_some();
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2019-08-26 12:50:15 +02:00
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let _ = (0..1).find(|x| **y == *x).is_some(); // one dereference less
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let _ = (0..1).find(|x| *x == 0).is_some();
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2019-08-29 10:06:56 +02:00
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let _ = v.iter().find(|x| **x == 0).is_some();
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2017-02-08 14:58:07 +01:00
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2019-01-31 02:15:29 +01:00
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// Check `find().is_some()`, multi-line case.
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2017-02-08 14:58:07 +01:00
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let _ = v.iter().find(|&x| {
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2017-02-07 21:05:30 +01:00
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*x < 0
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}
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).is_some();
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2019-01-31 02:15:29 +01:00
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// Check `position().is_some()`, single-line case.
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2017-02-07 21:05:30 +01:00
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let _ = v.iter().position(|&x| x < 0).is_some();
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2017-02-08 14:58:07 +01:00
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2019-01-31 02:15:29 +01:00
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// Check `position().is_some()`, multi-line case.
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2017-02-08 14:58:07 +01:00
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let _ = v.iter().position(|&x| {
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2017-02-07 21:05:30 +01:00
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x < 0
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}
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).is_some();
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2019-01-31 02:15:29 +01:00
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// Check `rposition().is_some()`, single-line case.
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2017-02-07 21:05:30 +01:00
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let _ = v.iter().rposition(|&x| x < 0).is_some();
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2017-02-08 14:58:07 +01:00
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2019-01-31 02:15:29 +01:00
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// Check `rposition().is_some()`, multi-line case.
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2017-02-08 14:58:07 +01:00
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let _ = v.iter().rposition(|&x| {
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2017-02-07 21:05:30 +01:00
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x < 0
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}
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).is_some();
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2019-01-31 02:15:29 +01:00
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// Check that we don't lint if the caller is not an `Iterator`.
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2017-02-07 21:05:30 +01:00
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let foo = IteratorFalsePositives { foo: 0 };
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let _ = foo.find().is_some();
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let _ = foo.position().is_some();
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let _ = foo.rposition().is_some();
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}
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fn main() {
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2019-10-16 19:43:26 +02:00
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filter_next();
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search_is_some();
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2017-02-07 21:05:30 +01:00
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}
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