mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-24 05:33:27 +00:00
388 lines
9.3 KiB
Rust
388 lines
9.3 KiB
Rust
// aux-build:option_helpers.rs
|
||
|
||
#![warn(clippy::all, clippy::pedantic, clippy::option_unwrap_used)]
|
||
#![allow(
|
||
clippy::blacklisted_name,
|
||
unused,
|
||
clippy::print_stdout,
|
||
clippy::non_ascii_literal,
|
||
clippy::new_without_default,
|
||
clippy::missing_docs_in_private_items,
|
||
clippy::needless_pass_by_value,
|
||
clippy::default_trait_access,
|
||
clippy::use_self,
|
||
clippy::new_ret_no_self,
|
||
clippy::useless_format
|
||
)]
|
||
|
||
#[macro_use]
|
||
extern crate option_helpers;
|
||
|
||
use std::collections::BTreeMap;
|
||
use std::collections::HashMap;
|
||
use std::collections::HashSet;
|
||
use std::collections::VecDeque;
|
||
use std::iter::FromIterator;
|
||
use std::ops::Mul;
|
||
use std::rc::{self, Rc};
|
||
use std::sync::{self, Arc};
|
||
|
||
use option_helpers::IteratorFalsePositives;
|
||
|
||
pub struct T;
|
||
|
||
impl T {
|
||
pub fn add(self, other: T) -> T {
|
||
self
|
||
}
|
||
|
||
// no error, not public interface
|
||
pub(crate) fn drop(&mut self) {}
|
||
|
||
// no error, private function
|
||
fn neg(self) -> Self {
|
||
self
|
||
}
|
||
|
||
// no error, private function
|
||
fn eq(&self, other: T) -> bool {
|
||
true
|
||
}
|
||
|
||
// No error; self is a ref.
|
||
fn sub(&self, other: T) -> &T {
|
||
self
|
||
}
|
||
|
||
// No error; different number of arguments.
|
||
fn div(self) -> T {
|
||
self
|
||
}
|
||
|
||
// No error; wrong return type.
|
||
fn rem(self, other: T) {}
|
||
|
||
// Fine
|
||
fn into_u32(self) -> u32 {
|
||
0
|
||
}
|
||
|
||
fn into_u16(&self) -> u16 {
|
||
0
|
||
}
|
||
|
||
fn to_something(self) -> u32 {
|
||
0
|
||
}
|
||
|
||
fn new(self) -> Self {
|
||
unimplemented!();
|
||
}
|
||
}
|
||
|
||
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
|
||
}
|
||
}
|
||
|
||
impl Mul<T> for T {
|
||
type Output = T;
|
||
// No error, obviously.
|
||
fn mul(self, other: T) -> T {
|
||
self
|
||
}
|
||
}
|
||
|
||
/// Checks implementation of the following lints:
|
||
/// * `OPTION_MAP_UNWRAP_OR`
|
||
/// * `OPTION_MAP_UNWRAP_OR_ELSE`
|
||
/// * `OPTION_MAP_OR_NONE`
|
||
#[rustfmt::skip]
|
||
fn option_methods() {
|
||
let opt = Some(1);
|
||
|
||
// Check `OPTION_MAP_UNWRAP_OR`.
|
||
// Single line case.
|
||
let _ = opt.map(|x| x + 1)
|
||
// Should lint even though this call is on a separate line.
|
||
.unwrap_or(0);
|
||
// Multi-line cases.
|
||
let _ = opt.map(|x| {
|
||
x + 1
|
||
}
|
||
).unwrap_or(0);
|
||
let _ = opt.map(|x| x + 1)
|
||
.unwrap_or({
|
||
0
|
||
});
|
||
// Single line `map(f).unwrap_or(None)` case.
|
||
let _ = opt.map(|x| Some(x + 1)).unwrap_or(None);
|
||
// Multi-line `map(f).unwrap_or(None)` cases.
|
||
let _ = opt.map(|x| {
|
||
Some(x + 1)
|
||
}
|
||
).unwrap_or(None);
|
||
let _ = opt
|
||
.map(|x| Some(x + 1))
|
||
.unwrap_or(None);
|
||
// macro case
|
||
let _ = opt_map!(opt, |x| x + 1).unwrap_or(0); // should not lint
|
||
|
||
// Should not lint if not copyable
|
||
let id: String = "identifier".to_string();
|
||
let _ = Some("prefix").map(|p| format!("{}.{}", p, id)).unwrap_or(id);
|
||
// ...but DO lint if the `unwrap_or` argument is not used in the `map`
|
||
let id: String = "identifier".to_string();
|
||
let _ = Some("prefix").map(|p| format!("{}.", p)).unwrap_or(id);
|
||
|
||
// Check OPTION_MAP_UNWRAP_OR_ELSE
|
||
// single line case
|
||
let _ = opt.map(|x| x + 1)
|
||
// Should lint even though this call is on a separate line.
|
||
.unwrap_or_else(|| 0);
|
||
// Multi-line cases.
|
||
let _ = opt.map(|x| {
|
||
x + 1
|
||
}
|
||
).unwrap_or_else(|| 0);
|
||
let _ = opt.map(|x| x + 1)
|
||
.unwrap_or_else(||
|
||
0
|
||
);
|
||
// Macro case.
|
||
// Should not lint.
|
||
let _ = opt_map!(opt, |x| x + 1).unwrap_or_else(|| 0);
|
||
|
||
// Check `OPTION_MAP_OR_NONE`.
|
||
// Single line case.
|
||
let _ = opt.map_or(None, |x| Some(x + 1));
|
||
// Multi-line case.
|
||
let _ = opt.map_or(None, |x| {
|
||
Some(x + 1)
|
||
}
|
||
);
|
||
}
|
||
|
||
/// Struct to generate false positives for things with `.iter()`.
|
||
#[derive(Copy, Clone)]
|
||
struct HasIter;
|
||
|
||
impl HasIter {
|
||
fn iter(self) -> IteratorFalsePositives {
|
||
IteratorFalsePositives { foo: 0 }
|
||
}
|
||
|
||
fn iter_mut(self) -> IteratorFalsePositives {
|
||
IteratorFalsePositives { foo: 0 }
|
||
}
|
||
}
|
||
|
||
/// Checks implementation of `FILTER_NEXT` lint.
|
||
#[rustfmt::skip]
|
||
fn filter_next() {
|
||
let v = vec![3, 2, 1, 0, -1, -2, -3];
|
||
|
||
// Single-line case.
|
||
let _ = v.iter().filter(|&x| *x < 0).next();
|
||
|
||
// Multi-line case.
|
||
let _ = v.iter().filter(|&x| {
|
||
*x < 0
|
||
}
|
||
).next();
|
||
|
||
// Check that hat we don't lint if the caller is not an `Iterator`.
|
||
let foo = IteratorFalsePositives { foo: 0 };
|
||
let _ = foo.filter().next();
|
||
}
|
||
|
||
/// Checks implementation of `SEARCH_IS_SOME` lint.
|
||
#[rustfmt::skip]
|
||
fn search_is_some() {
|
||
let v = vec![3, 2, 1, 0, -1, -2, -3];
|
||
|
||
// Check `find().is_some()`, single-line case.
|
||
let _ = v.iter().find(|&x| *x < 0).is_some();
|
||
|
||
// Check `find().is_some()`, multi-line case.
|
||
let _ = v.iter().find(|&x| {
|
||
*x < 0
|
||
}
|
||
).is_some();
|
||
|
||
// Check `position().is_some()`, single-line case.
|
||
let _ = v.iter().position(|&x| x < 0).is_some();
|
||
|
||
// Check `position().is_some()`, multi-line case.
|
||
let _ = v.iter().position(|&x| {
|
||
x < 0
|
||
}
|
||
).is_some();
|
||
|
||
// Check `rposition().is_some()`, single-line case.
|
||
let _ = v.iter().rposition(|&x| x < 0).is_some();
|
||
|
||
// Check `rposition().is_some()`, multi-line case.
|
||
let _ = v.iter().rposition(|&x| {
|
||
x < 0
|
||
}
|
||
).is_some();
|
||
|
||
// Check that we don't lint if the caller is not an `Iterator`.
|
||
let foo = IteratorFalsePositives { foo: 0 };
|
||
let _ = foo.find().is_some();
|
||
let _ = foo.position().is_some();
|
||
let _ = foo.rposition().is_some();
|
||
}
|
||
|
||
/// Checks implementation of the `OR_FUN_CALL` lint.
|
||
fn or_fun_call() {
|
||
struct Foo;
|
||
|
||
impl Foo {
|
||
fn new() -> Foo {
|
||
Foo
|
||
}
|
||
}
|
||
|
||
enum Enum {
|
||
A(i32),
|
||
}
|
||
|
||
fn make<T>() -> T {
|
||
unimplemented!();
|
||
}
|
||
|
||
let with_enum = Some(Enum::A(1));
|
||
with_enum.unwrap_or(Enum::A(5));
|
||
|
||
let with_const_fn = Some(::std::time::Duration::from_secs(1));
|
||
with_const_fn.unwrap_or(::std::time::Duration::from_secs(5));
|
||
|
||
let with_constructor = Some(vec![1]);
|
||
with_constructor.unwrap_or(make());
|
||
|
||
let with_new = Some(vec![1]);
|
||
with_new.unwrap_or(Vec::new());
|
||
|
||
let with_const_args = Some(vec![1]);
|
||
with_const_args.unwrap_or(Vec::with_capacity(12));
|
||
|
||
let with_err: Result<_, ()> = Ok(vec![1]);
|
||
with_err.unwrap_or(make());
|
||
|
||
let with_err_args: Result<_, ()> = Ok(vec![1]);
|
||
with_err_args.unwrap_or(Vec::with_capacity(12));
|
||
|
||
let with_default_trait = Some(1);
|
||
with_default_trait.unwrap_or(Default::default());
|
||
|
||
let with_default_type = Some(1);
|
||
with_default_type.unwrap_or(u64::default());
|
||
|
||
let with_vec = Some(vec![1]);
|
||
with_vec.unwrap_or(vec![]);
|
||
|
||
// FIXME #944: ~|SUGGESTION with_vec.unwrap_or_else(|| vec![]);
|
||
|
||
let without_default = Some(Foo);
|
||
without_default.unwrap_or(Foo::new());
|
||
|
||
let mut map = HashMap::<u64, String>::new();
|
||
map.entry(42).or_insert(String::new());
|
||
|
||
let mut btree = BTreeMap::<u64, String>::new();
|
||
btree.entry(42).or_insert(String::new());
|
||
|
||
let stringy = Some(String::from(""));
|
||
let _ = stringy.unwrap_or("".to_owned());
|
||
}
|
||
|
||
/// Checks implementation of `ITER_NTH` lint.
|
||
fn iter_nth() {
|
||
let mut some_vec = vec![0, 1, 2, 3];
|
||
let mut boxed_slice: Box<[u8]> = Box::new([0, 1, 2, 3]);
|
||
let mut some_vec_deque: VecDeque<_> = some_vec.iter().cloned().collect();
|
||
|
||
{
|
||
// Make sure we lint `.iter()` for relevant types.
|
||
let bad_vec = some_vec.iter().nth(3);
|
||
let bad_slice = &some_vec[..].iter().nth(3);
|
||
let bad_boxed_slice = boxed_slice.iter().nth(3);
|
||
let bad_vec_deque = some_vec_deque.iter().nth(3);
|
||
}
|
||
|
||
{
|
||
// Make sure we lint `.iter_mut()` for relevant types.
|
||
let bad_vec = some_vec.iter_mut().nth(3);
|
||
}
|
||
{
|
||
let bad_slice = &some_vec[..].iter_mut().nth(3);
|
||
}
|
||
{
|
||
let bad_vec_deque = some_vec_deque.iter_mut().nth(3);
|
||
}
|
||
|
||
// Make sure we don't lint for non-relevant types.
|
||
let false_positive = HasIter;
|
||
let ok = false_positive.iter().nth(3);
|
||
let ok_mut = false_positive.iter_mut().nth(3);
|
||
}
|
||
|
||
#[allow(clippy::similar_names)]
|
||
fn main() {
|
||
let opt = Some(0);
|
||
let _ = opt.unwrap();
|
||
}
|