mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-24 05:33:27 +00:00
428 lines
12 KiB
Rust
428 lines
12 KiB
Rust
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#![feature(const_fn)]
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#![warn(clippy, clippy_pedantic)]
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#![allow(blacklisted_name, unused, print_stdout, non_ascii_literal, new_without_default,
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new_without_default_derive, missing_docs_in_private_items, needless_pass_by_value)]
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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::iter::FromIterator;
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use std::rc::{self, Rc};
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use std::sync::{self, Arc};
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pub struct T;
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impl T {
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pub fn add(self, other: T) -> T { self }
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pub(crate) fn drop(&mut self) { } // no error, not public interfact
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fn neg(self) -> Self { self } // no error, private function
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fn eq(&self, other: T) -> bool { true } // no error, private function
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fn sub(&self, other: T) -> &T { self } // no error, self is a ref
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fn div(self) -> T { self } // no error, different #arguments
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fn rem(self, other: T) { } // no error, wrong return type
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fn into_u32(self) -> u32 { 0 } // fine
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fn into_u16(&self) -> u16 { 0 }
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fn to_something(self) -> u32 { 0 }
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fn new(self) {}
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}
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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 #734
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#[allow(needless_lifetimes)]
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pub fn new<'b>(s: &'b str) -> Lt<'b> { unimplemented!() }
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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 #734
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pub fn new(s: &str) -> Lt2 { unimplemented!() }
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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 #734
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pub fn new() -> Lt3<'static> { unimplemented!() }
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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 { U }
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fn to_something(self) -> u32 { 0 } // ok because U is Copy
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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>> { None }
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}
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impl Mul<T> for T {
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type Output = T;
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fn mul(self, other: T) -> T { self } // no error, obviously
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}
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/// Utility macro to test linting behavior in `option_methods()`
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/// The lints included in `option_methods()` should not lint if the call to map is partially
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/// within a macro
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macro_rules! opt_map {
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($opt:expr, $map:expr) => {($opt).map($map)};
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}
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/// Checks implementation of the following lints:
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/// * `OPTION_MAP_UNWRAP_OR`
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/// * `OPTION_MAP_UNWRAP_OR_ELSE`
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/// * `OPTION_MAP_OR_NONE`
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fn option_methods() {
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let opt = Some(1);
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// Check OPTION_MAP_UNWRAP_OR
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// single line case
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let _ = opt.map(|x| x + 1)
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.unwrap_or(0); // should lint even though this call is on a separate line
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// multi line cases
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let _ = opt.map(|x| {
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x + 1
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}
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).unwrap_or(0);
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let _ = opt.map(|x| x + 1)
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.unwrap_or({
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0
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});
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// single line `map(f).unwrap_or(None)` case
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let _ = opt.map(|x| Some(x + 1)).unwrap_or(None);
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// multiline `map(f).unwrap_or(None)` cases
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let _ = opt.map(|x| {
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Some(x + 1)
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}
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).unwrap_or(None);
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let _ = opt
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.map(|x| Some(x + 1))
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.unwrap_or(None);
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// macro case
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let _ = opt_map!(opt, |x| x + 1).unwrap_or(0); // should not lint
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// Check OPTION_MAP_UNWRAP_OR_ELSE
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// single line case
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let _ = opt.map(|x| x + 1)
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.unwrap_or_else(|| 0); // should lint even though this call is on a separate line
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// multi line cases
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let _ = opt.map(|x| {
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x + 1
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}
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).unwrap_or_else(|| 0);
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let _ = opt.map(|x| x + 1)
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.unwrap_or_else(||
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0
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);
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// macro case
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let _ = opt_map!(opt, |x| x + 1).unwrap_or_else(|| 0); // should not lint
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// Check OPTION_MAP_OR_NONE
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// single line case
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let _ = opt.map_or(None, |x| Some(x + 1));
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// multi line case
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let _ = opt.map_or(None, |x| {
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Some(x + 1)
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}
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);
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}
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/// Checks implementation of the following lints:
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/// * `RESULT_MAP_UNWRAP_OR_ELSE`
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fn result_methods() {
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let res: Result<i32, ()> = Ok(1);
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// Check RESULT_MAP_UNWRAP_OR_ELSE
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// single line case
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let _ = res.map(|x| x + 1)
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.unwrap_or_else(|e| 0); // should lint even though this call is on a separate line
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// multi line cases
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let _ = res.map(|x| {
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x + 1
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}
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).unwrap_or_else(|e| 0);
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let _ = res.map(|x| x + 1)
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.unwrap_or_else(|e|
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0
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);
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// macro case
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let _ = opt_map!(res, |x| x + 1).unwrap_or_else(|e| 0); // should not lint
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}
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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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/// Struct to generate false positive for Iterator-based lints
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#[derive(Copy, Clone)]
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struct IteratorFalsePositives {
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foo: u32,
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}
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impl IteratorFalsePositives {
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fn filter(self) -> IteratorFalsePositives {
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self
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}
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fn next(self) -> IteratorFalsePositives {
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self
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}
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fn find(self) -> Option<u32> {
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Some(self.foo)
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}
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fn position(self) -> Option<u32> {
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Some(self.foo)
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}
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fn rposition(self) -> Option<u32> {
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Some(self.foo)
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}
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fn nth(self, n: usize) -> Option<u32> {
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Some(self.foo)
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}
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fn skip(self, _: usize) -> IteratorFalsePositives {
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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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fn filter_next() {
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let v = vec![3, 2, 1, 0, -1, -2, -3];
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// check single-line case
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let _ = v.iter().filter(|&x| *x < 0).next();
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// check 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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}
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/// Checks implementation of `SEARCH_IS_SOME` lint
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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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// check `find().is_some()`, single-line
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let _ = v.iter().find(|&x| *x < 0).is_some();
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// check `find().is_some()`, multi-line
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let _ = v.iter().find(|&x| {
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*x < 0
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}
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).is_some();
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// check `position().is_some()`, single-line
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let _ = v.iter().position(|&x| x < 0).is_some();
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// check `position().is_some()`, multi-line
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let _ = v.iter().position(|&x| {
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x < 0
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}
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).is_some();
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// check `rposition().is_some()`, single-line
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let _ = v.iter().rposition(|&x| x < 0).is_some();
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// check `rposition().is_some()`, multi-line
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let _ = v.iter().rposition(|&x| {
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x < 0
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}
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).is_some();
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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.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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/// Checks implementation of the `OR_FUN_CALL` lint
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fn or_fun_call() {
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struct Foo;
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impl Foo {
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fn new() -> Foo { Foo }
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}
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enum Enum {
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A(i32),
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}
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const fn make_const(i: i32) -> i32 { i }
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fn make<T>() -> T { unimplemented!(); }
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let with_enum = Some(Enum::A(1));
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with_enum.unwrap_or(Enum::A(5));
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let with_const_fn = Some(1);
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with_const_fn.unwrap_or(make_const(5));
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let with_constructor = Some(vec![1]);
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with_constructor.unwrap_or(make());
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let with_new = Some(vec![1]);
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with_new.unwrap_or(Vec::new());
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let with_const_args = Some(vec![1]);
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with_const_args.unwrap_or(Vec::with_capacity(12));
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let with_err : Result<_, ()> = Ok(vec![1]);
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with_err.unwrap_or(make());
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let with_err_args : Result<_, ()> = Ok(vec![1]);
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with_err_args.unwrap_or(Vec::with_capacity(12));
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let with_default_trait = Some(1);
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with_default_trait.unwrap_or(Default::default());
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let with_default_type = Some(1);
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with_default_type.unwrap_or(u64::default());
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let with_vec = Some(vec![1]);
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with_vec.unwrap_or(vec![]);
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// FIXME #944: ~|SUGGESTION with_vec.unwrap_or_else(|| vec![]);
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let without_default = Some(Foo);
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without_default.unwrap_or(Foo::new());
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let mut map = HashMap::<u64, String>::new();
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map.entry(42).or_insert(String::new());
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let mut btree = BTreeMap::<u64, String>::new();
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btree.entry(42).or_insert(String::new());
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let stringy = Some(String::from(""));
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let _ = stringy.unwrap_or("".to_owned());
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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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/// Checks implementation of `ITER_SKIP_NEXT` lint
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fn iter_skip_next() {
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let mut some_vec = vec![0, 1, 2, 3];
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let _ = some_vec.iter().skip(42).next();
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let _ = some_vec.iter().cycle().skip(42).next();
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let _ = (1..10).skip(10).next();
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let _ = &some_vec[..].iter().skip(3).next();
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let foo = IteratorFalsePositives { foo : 0 };
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let _ = foo.skip(42).next();
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let _ = foo.filter().skip(42).next();
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}
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/// Calls which should trigger the `UNNECESSARY_FOLD` lint
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fn unnecessary_fold() {
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// Can be replaced by .any
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let _ = (0..3).fold(false, |acc, x| acc || x > 2);
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// Can be replaced by .all
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let _ = (0..3).fold(true, |acc, x| acc && x > 2);
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// Can be replaced by .sum
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let _ = (0..3).fold(0, |acc, x| acc + x);
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// Can be replaced by .product
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let _ = (0..3).fold(1, |acc, x| acc * x);
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}
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/// Should trigger the `UNNECESSARY_FOLD` lint, with an error span including exactly `.fold(...)`
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fn unnecessary_fold_span_for_multi_element_chain() {
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let _ = (0..3).map(|x| 2 * x).fold(false, |acc, x| acc || x > 2);
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}
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/// Calls which should not trigger the `UNNECESSARY_FOLD` lint
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fn unnecessary_fold_should_ignore() {
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let _ = (0..3).fold(true, |acc, x| acc || x > 2);
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let _ = (0..3).fold(false, |acc, x| acc && x > 2);
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let _ = (0..3).fold(1, |acc, x| acc + x);
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let _ = (0..3).fold(0, |acc, x| acc * x);
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let _ = (0..3).fold(0, |acc, x| 1 + acc + x);
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// We only match against an accumulator on the left
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// hand side. We could lint for .sum and .product when
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// it's on the right, but don't for now (and this wouldn't
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// be valid if we extended the lint to cover arbitrary numeric
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// types).
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let _ = (0..3).fold(false, |acc, x| x > 2 || acc);
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let _ = (0..3).fold(true, |acc, x| x > 2 && acc);
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let _ = (0..3).fold(0, |acc, x| x + acc);
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let _ = (0..3).fold(1, |acc, x| x * acc);
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}
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#[allow(similar_names)]
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fn main() {
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let opt = Some(0);
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let _ = opt.unwrap();
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}
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