507 lines
16 KiB
Rust
507 lines
16 KiB
Rust
#![feature(plugin)]
|
||
#![feature(const_fn)]
|
||
#![plugin(clippy)]
|
||
|
||
#![deny(clippy, clippy_pedantic)]
|
||
#![allow(blacklisted_name, unused, print_stdout, non_ascii_literal, new_without_default, new_without_default_derive)]
|
||
|
||
use std::collections::BTreeMap;
|
||
use std::collections::HashMap;
|
||
use std::collections::HashSet;
|
||
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
|
||
|
||
fn new(self) {}
|
||
//~^ ERROR methods called `new` usually take no self
|
||
//~| ERROR methods called `new` usually return `Self`
|
||
}
|
||
|
||
struct Lt<'a> {
|
||
foo: &'a u32,
|
||
}
|
||
|
||
impl<'a> Lt<'a> {
|
||
// The lifetime is different, but that’s irrelevant, see #734
|
||
#[allow(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 #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 #734
|
||
pub fn new() -> Lt3<'static> { unimplemented!() }
|
||
}
|
||
|
||
#[derive(Clone,Copy)]
|
||
struct U;
|
||
|
||
impl U {
|
||
fn new() -> Self { U }
|
||
fn to_something(self) -> u32 { 0 } // ok because U is Copy
|
||
}
|
||
|
||
struct V<T> {
|
||
_dummy: T
|
||
}
|
||
|
||
impl<T> V<T> {
|
||
fn new() -> Option<V<T>> { None }
|
||
}
|
||
|
||
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 }
|
||
}
|
||
|
||
enum Enum {
|
||
A(i32),
|
||
}
|
||
|
||
const fn make_const(i: i32) -> i32 { i }
|
||
|
||
fn make<T>() -> T { unimplemented!(); }
|
||
|
||
let with_enum = Some(Enum::A(1));
|
||
with_enum.unwrap_or(Enum::A(5));
|
||
|
||
let with_const_fn = Some(1);
|
||
with_const_fn.unwrap_or(make_const(5));
|
||
|
||
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
|
||
// FIXME #944: ~|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);
|
||
}
|
||
|
||
#[allow(similar_names)]
|
||
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
|
||
|
||
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!");
|
||
let res3: Result<u32, MyErrorWithParam<u8>>= Ok(0);
|
||
res3.ok().expect("whoof"); //~ERROR called `ok().expect()`
|
||
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
|
||
}
|
||
|
||
#[allow(unnecessary_operation)]
|
||
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`
|
||
//~| HELP try this
|
||
//~| SUGGESTION v.extend_from_slice(&["Hello", "World"]);
|
||
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`
|
||
//~| HELP try this
|
||
//FIXME: the suggestion if broken because of the macro
|
||
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
|
||
}
|
||
|
||
fn clone_on_double_ref() {
|
||
let x = vec![1];
|
||
let y = &&x;
|
||
let z: &Vec<_> = y.clone(); //~ERROR using `clone` on a double
|
||
//~| HELP try dereferencing it
|
||
//~| SUGGESTION let z: &Vec<_> = (*y).clone();
|
||
//~^^^ERROR using `clone` on a `Copy` type
|
||
println!("{:p} {:p}",*y, z);
|
||
}
|
||
|
||
fn single_char_pattern() {
|
||
let x = "foo";
|
||
x.split("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.split('x');
|
||
|
||
x.split("xx");
|
||
|
||
x.split('x');
|
||
|
||
let y = "x";
|
||
x.split(y);
|
||
|
||
// Not yet testing for multi-byte characters
|
||
// Changing `r.len() == 1` to `r.chars().count() == 1` in `lint_single_char_pattern`
|
||
// should have done this but produced an ICE
|
||
//
|
||
// We may not want to suggest changing these anyway
|
||
// See: https://github.com/Manishearth/rust-clippy/issues/650#issuecomment-184328984
|
||
x.split("ß");
|
||
x.split("ℝ");
|
||
x.split("💣");
|
||
// Can't use this lint for unicode code points which don't fit in a char
|
||
x.split("❤️");
|
||
|
||
x.contains("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.contains('x');
|
||
x.starts_with("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.starts_with('x');
|
||
x.ends_with("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.ends_with('x');
|
||
x.find("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.find('x');
|
||
x.rfind("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.rfind('x');
|
||
x.rsplit("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.rsplit('x');
|
||
x.split_terminator("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.split_terminator('x');
|
||
x.rsplit_terminator("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.rsplit_terminator('x');
|
||
x.splitn(0, "x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.splitn(0, 'x');
|
||
x.rsplitn(0, "x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.rsplitn(0, 'x');
|
||
x.matches("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.matches('x');
|
||
x.rmatches("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.rmatches('x');
|
||
x.match_indices("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.match_indices('x');
|
||
x.rmatch_indices("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.rmatch_indices('x');
|
||
x.trim_left_matches("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.trim_left_matches('x');
|
||
x.trim_right_matches("x");
|
||
//~^ ERROR single-character string constant used as pattern
|
||
//~| HELP try using a char instead:
|
||
//~| SUGGESTION x.trim_right_matches('x');
|
||
|
||
let h = HashSet::<String>::new();
|
||
h.contains("X"); // should not warn
|
||
}
|
||
|
||
#[allow(result_unwrap_used)]
|
||
fn temporary_cstring() {
|
||
use std::ffi::CString;
|
||
|
||
CString::new("foo").unwrap().as_ptr();
|
||
//~^ ERROR you are getting the inner pointer of a temporary `CString`
|
||
//~| NOTE that pointer will be invalid outside this expression
|
||
//~| HELP assign the `CString` to a variable to extend its lifetime
|
||
}
|