337 lines
11 KiB
Rust
337 lines
11 KiB
Rust
#![feature(plugin)]
|
|
#![plugin(clippy)]
|
|
|
|
#![allow(unused)]
|
|
#![deny(clippy, clippy_pedantic)]
|
|
|
|
use std::collections::BTreeMap;
|
|
use std::collections::HashMap;
|
|
use std::ops::Mul;
|
|
|
|
struct T;
|
|
|
|
impl T {
|
|
fn add(self, other: T) -> T { self } //~ERROR defining a method called `add`
|
|
fn drop(&mut self) { } //~ERROR defining a method called `drop`
|
|
|
|
fn sub(&self, other: T) -> &T { self } // no error, self is a ref
|
|
fn div(self) -> T { self } // no error, different #arguments
|
|
fn rem(self, other: T) { } // no error, wrong return type
|
|
|
|
fn into_u32(self) -> u32 { 0 } // fine
|
|
fn into_u16(&self) -> u16 { 0 } //~ERROR methods called `into_*` usually take self by value
|
|
|
|
fn to_something(self) -> u32 { 0 } //~ERROR methods called `to_*` usually take self by reference
|
|
}
|
|
|
|
#[derive(Clone,Copy)]
|
|
struct U;
|
|
|
|
impl U {
|
|
fn to_something(self) -> u32 { 0 } // ok because U is Copy
|
|
}
|
|
|
|
impl Mul<T> for T {
|
|
type Output = T;
|
|
fn mul(self, other: T) -> T { self } // no error, obviously
|
|
}
|
|
|
|
/// Utility macro to test linting behavior in `option_methods()`
|
|
/// The lints included in `option_methods()` should not lint if the call to map is partially
|
|
/// within a macro
|
|
macro_rules! opt_map {
|
|
($opt:expr, $map:expr) => {($opt).map($map)};
|
|
}
|
|
|
|
/// Checks implementation of the following lints:
|
|
/// OPTION_MAP_UNWRAP_OR
|
|
/// OPTION_MAP_UNWRAP_OR_ELSE
|
|
fn option_methods() {
|
|
let opt = Some(1);
|
|
|
|
// Check OPTION_MAP_UNWRAP_OR
|
|
// single line case
|
|
let _ = opt.map(|x| x + 1) //~ ERROR called `map(f).unwrap_or(a)`
|
|
//~| NOTE replace `map(|x| x + 1).unwrap_or(0)`
|
|
.unwrap_or(0); // should lint even though this call is on a separate line
|
|
// multi line cases
|
|
let _ = opt.map(|x| { //~ ERROR called `map(f).unwrap_or(a)`
|
|
x + 1
|
|
}
|
|
).unwrap_or(0);
|
|
let _ = opt.map(|x| x + 1) //~ ERROR called `map(f).unwrap_or(a)`
|
|
.unwrap_or({
|
|
0
|
|
});
|
|
// macro case
|
|
let _ = opt_map!(opt, |x| x + 1).unwrap_or(0); // should not lint
|
|
|
|
// Check OPTION_MAP_UNWRAP_OR_ELSE
|
|
// single line case
|
|
let _ = opt.map(|x| x + 1) //~ ERROR called `map(f).unwrap_or_else(g)`
|
|
//~| NOTE replace `map(|x| x + 1).unwrap_or_else(|| 0)`
|
|
.unwrap_or_else(|| 0); // should lint even though this call is on a separate line
|
|
// multi line cases
|
|
let _ = opt.map(|x| { //~ ERROR called `map(f).unwrap_or_else(g)`
|
|
x + 1
|
|
}
|
|
).unwrap_or_else(|| 0);
|
|
let _ = opt.map(|x| x + 1) //~ ERROR called `map(f).unwrap_or_else(g)`
|
|
.unwrap_or_else(||
|
|
0
|
|
);
|
|
// macro case
|
|
let _ = opt_map!(opt, |x| x + 1).unwrap_or_else(|| 0); // should not lint
|
|
|
|
}
|
|
|
|
/// Struct to generate false positive for Iterator-based lints
|
|
#[derive(Copy, Clone)]
|
|
struct IteratorFalsePositives {
|
|
foo: u32,
|
|
}
|
|
|
|
impl IteratorFalsePositives {
|
|
fn filter(self) -> IteratorFalsePositives {
|
|
self
|
|
}
|
|
|
|
fn next(self) -> IteratorFalsePositives {
|
|
self
|
|
}
|
|
|
|
fn find(self) -> Option<u32> {
|
|
Some(self.foo)
|
|
}
|
|
|
|
fn position(self) -> Option<u32> {
|
|
Some(self.foo)
|
|
}
|
|
|
|
fn rposition(self) -> Option<u32> {
|
|
Some(self.foo)
|
|
}
|
|
}
|
|
|
|
/// Checks implementation of FILTER_NEXT lint
|
|
fn filter_next() {
|
|
let v = vec![3, 2, 1, 0, -1, -2, -3];
|
|
|
|
// check single-line case
|
|
let _ = v.iter().filter(|&x| *x < 0).next();
|
|
//~^ ERROR called `filter(p).next()` on an Iterator.
|
|
//~| NOTE replace `filter(|&x| *x < 0).next()`
|
|
|
|
// check multi-line case
|
|
let _ = v.iter().filter(|&x| { //~ERROR called `filter(p).next()` on an Iterator.
|
|
*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();
|
|
}
|
|
|
|
/// Checks implementation of SEARCH_IS_SOME lint
|
|
fn search_is_some() {
|
|
let v = vec![3, 2, 1, 0, -1, -2, -3];
|
|
|
|
// check `find().is_some()`, single-line
|
|
let _ = v.iter().find(|&x| *x < 0).is_some();
|
|
//~^ ERROR called `is_some()` after searching
|
|
//~| NOTE replace `find(|&x| *x < 0).is_some()`
|
|
|
|
// check `find().is_some()`, multi-line
|
|
let _ = v.iter().find(|&x| { //~ERROR called `is_some()` after searching
|
|
*x < 0
|
|
}
|
|
).is_some();
|
|
|
|
// check `position().is_some()`, single-line
|
|
let _ = v.iter().position(|&x| x < 0).is_some();
|
|
//~^ ERROR called `is_some()` after searching
|
|
//~| NOTE replace `position(|&x| x < 0).is_some()`
|
|
|
|
// check `position().is_some()`, multi-line
|
|
let _ = v.iter().position(|&x| { //~ERROR called `is_some()` after searching
|
|
x < 0
|
|
}
|
|
).is_some();
|
|
|
|
// check `rposition().is_some()`, single-line
|
|
let _ = v.iter().rposition(|&x| x < 0).is_some();
|
|
//~^ ERROR called `is_some()` after searching
|
|
//~| NOTE replace `rposition(|&x| x < 0).is_some()`
|
|
|
|
// check `rposition().is_some()`, multi-line
|
|
let _ = v.iter().rposition(|&x| { //~ERROR called `is_some()` after searching
|
|
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 }
|
|
}
|
|
|
|
fn make<T>() -> T { unimplemented!(); }
|
|
|
|
let with_constructor = Some(vec![1]);
|
|
with_constructor.unwrap_or(make());
|
|
//~^ERROR use of `unwrap_or`
|
|
//~|HELP try this
|
|
//~|SUGGESTION with_constructor.unwrap_or_else(make)
|
|
|
|
let with_new = Some(vec![1]);
|
|
with_new.unwrap_or(Vec::new());
|
|
//~^ERROR use of `unwrap_or`
|
|
//~|HELP try this
|
|
//~|SUGGESTION with_new.unwrap_or_default();
|
|
|
|
let with_const_args = Some(vec![1]);
|
|
with_const_args.unwrap_or(Vec::with_capacity(12));
|
|
//~^ERROR use of `unwrap_or`
|
|
//~|HELP try this
|
|
//~|SUGGESTION with_const_args.unwrap_or_else(|| Vec::with_capacity(12));
|
|
|
|
let with_err : Result<_, ()> = Ok(vec![1]);
|
|
with_err.unwrap_or(make());
|
|
//~^ERROR use of `unwrap_or`
|
|
//~|HELP try this
|
|
//~|SUGGESTION with_err.unwrap_or_else(|_| make());
|
|
|
|
let with_err_args : Result<_, ()> = Ok(vec![1]);
|
|
with_err_args.unwrap_or(Vec::with_capacity(12));
|
|
//~^ERROR use of `unwrap_or`
|
|
//~|HELP try this
|
|
//~|SUGGESTION with_err_args.unwrap_or_else(|_| Vec::with_capacity(12));
|
|
|
|
let with_default_trait = Some(1);
|
|
with_default_trait.unwrap_or(Default::default());
|
|
//~^ERROR use of `unwrap_or`
|
|
//~|HELP try this
|
|
//~|SUGGESTION with_default_trait.unwrap_or_default();
|
|
|
|
let with_default_type = Some(1);
|
|
with_default_type.unwrap_or(u64::default());
|
|
//~^ERROR use of `unwrap_or`
|
|
//~|HELP try this
|
|
//~|SUGGESTION with_default_type.unwrap_or_default();
|
|
|
|
let with_vec = Some(vec![1]);
|
|
with_vec.unwrap_or(vec![]);
|
|
//~^ERROR use of `unwrap_or`
|
|
//~|HELP try this
|
|
//~|SUGGESTION with_vec.unwrap_or_else(|| vec![]);
|
|
|
|
let without_default = Some(Foo);
|
|
without_default.unwrap_or(Foo::new());
|
|
//~^ERROR use of `unwrap_or`
|
|
//~|HELP try this
|
|
//~|SUGGESTION without_default.unwrap_or_else(Foo::new);
|
|
|
|
let mut map = HashMap::<u64, String>::new();
|
|
map.entry(42).or_insert(String::new());
|
|
//~^ERROR use of `or_insert` followed by a function call
|
|
//~|HELP try this
|
|
//~|SUGGESTION map.entry(42).or_insert_with(String::new);
|
|
|
|
let mut btree = BTreeMap::<u64, String>::new();
|
|
btree.entry(42).or_insert(String::new());
|
|
//~^ERROR use of `or_insert` followed by a function call
|
|
//~|HELP try this
|
|
//~|SUGGESTION btree.entry(42).or_insert_with(String::new);
|
|
}
|
|
|
|
fn main() {
|
|
use std::io;
|
|
|
|
let opt = Some(0);
|
|
let _ = opt.unwrap(); //~ERROR used unwrap() on an Option
|
|
|
|
let res: Result<i32, ()> = Ok(0);
|
|
let _ = res.unwrap(); //~ERROR used unwrap() on a Result
|
|
|
|
let _ = "str".to_string(); //~ERROR `"str".to_owned()` is faster
|
|
|
|
let v = &"str";
|
|
let string = v.to_string(); //~ERROR `(*v).to_owned()` is faster
|
|
let _again = string.to_string(); //~ERROR `String::to_string` is an inefficient way to clone a `String`; use `clone()` instead
|
|
|
|
res.ok().expect("disaster!"); //~ERROR called `ok().expect()`
|
|
// the following should not warn, since `expect` isn't implemented unless
|
|
// the error type implements `Debug`
|
|
let res2: Result<i32, MyError> = Ok(0);
|
|
res2.ok().expect("oh noes!");
|
|
// we currently don't warn if the error type has a type parameter
|
|
// (but it would be nice if we did)
|
|
let res3: Result<u32, MyErrorWithParam<u8>>= Ok(0);
|
|
res3.ok().expect("whoof");
|
|
let res4: Result<u32, io::Error> = Ok(0);
|
|
res4.ok().expect("argh"); //~ERROR called `ok().expect()`
|
|
let res5: io::Result<u32> = Ok(0);
|
|
res5.ok().expect("oops"); //~ERROR called `ok().expect()`
|
|
let res6: Result<u32, &str> = Ok(0);
|
|
res6.ok().expect("meh"); //~ERROR called `ok().expect()`
|
|
}
|
|
|
|
struct MyError(()); // doesn't implement Debug
|
|
|
|
#[derive(Debug)]
|
|
struct MyErrorWithParam<T> {
|
|
x: T
|
|
}
|
|
|
|
fn starts_with() {
|
|
"".chars().next() == Some(' ');
|
|
//~^ ERROR starts_with
|
|
//~| HELP like this
|
|
//~| SUGGESTION "".starts_with(' ')
|
|
|
|
Some(' ') != "".chars().next();
|
|
//~^ ERROR starts_with
|
|
//~| HELP like this
|
|
//~| SUGGESTION !"".starts_with(' ')
|
|
}
|
|
|
|
fn use_extend_from_slice() {
|
|
let mut v : Vec<&'static str> = vec![];
|
|
v.extend(&["Hello", "World"]); //~ERROR use of `extend`
|
|
v.extend(&vec!["Some", "more"]);
|
|
//~^ERROR use of `extend`
|
|
//~| HELP try this
|
|
//~| SUGGESTION v.extend_from_slice(&vec!["Some", "more"]);
|
|
|
|
v.extend(vec!["And", "even", "more"].iter()); //~ERROR use of `extend`
|
|
let o : Option<&'static str> = None;
|
|
v.extend(o);
|
|
v.extend(Some("Bye"));
|
|
v.extend(vec!["Not", "like", "this"]);
|
|
v.extend(["But", "this"].iter());
|
|
//~^ERROR use of `extend
|
|
//~| HELP try this
|
|
//~| SUGGESTION v.extend_from_slice(&["But", "this"]);
|
|
}
|
|
|
|
fn clone_on_copy() {
|
|
42.clone(); //~ERROR using `clone` on a `Copy` type
|
|
vec![1].clone(); // ok, not a Copy type
|
|
Some(vec![1]).clone(); // ok, not a Copy type
|
|
}
|
|
|
|
fn clone_on_copy_generic<T: Copy>(t: T) {
|
|
t.clone(); //~ERROR using `clone` on a `Copy` type
|
|
Some(t).clone(); //~ERROR using `clone` on a `Copy` type
|
|
}
|