README.md

   1 #rust-clippy
   2 [![Build Status](https://travis-ci.org/Manishearth/rust-clippy.svg?branch=master)](https://travis-ci.org/Manishearth/rust-clippy)
   3
   4 A collection of lints to catch common mistakes and improve your Rust code.
   5
   6 [Jump to usage instructions](#usage)
   7
   8 ##Lints
   9 There are 77 lints included in this crate:
  10
  11 name                                                                                                     | default | meaning
  12 ---------------------------------------------------------------------------------------------------------|---------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  13 [approx_constant](https://github.com/Manishearth/rust-clippy/wiki#approx_constant)                       | warn    | the approximate of a known float constant (in `std::f64::consts` or `std::f32::consts`) is found; suggests to use the constant
  14 [bad_bit_mask](https://github.com/Manishearth/rust-clippy/wiki#bad_bit_mask)                             | warn    | expressions of the form `_ & mask == select` that will only ever return `true` or `false` (because in the example `select` containing bits that `mask` doesn't have)
  15 [block_in_if_condition_expr](https://github.com/Manishearth/rust-clippy/wiki#block_in_if_condition_expr) | warn    | braces can be eliminated in conditions that are expressions, e.g `if { true } ...`
  16 [block_in_if_condition_stmt](https://github.com/Manishearth/rust-clippy/wiki#block_in_if_condition_stmt) | warn    | avoid complex blocks in conditions, instead move the block higher and bind it with 'let'; e.g: `if { let x = true; x } ...`
  17 [box_vec](https://github.com/Manishearth/rust-clippy/wiki#box_vec)                                       | warn    | usage of `Box<Vec<T>>`, vector elements are already on the heap
  18 [cast_possible_truncation](https://github.com/Manishearth/rust-clippy/wiki#cast_possible_truncation)     | allow   | casts that may cause truncation of the value, e.g `x as u8` where `x: u32`, or `x as i32` where `x: f32`
  19 [cast_possible_wrap](https://github.com/Manishearth/rust-clippy/wiki#cast_possible_wrap)                 | allow   | casts that may cause wrapping around the value, e.g `x as i32` where `x: u32` and `x > i32::MAX`
  20 [cast_precision_loss](https://github.com/Manishearth/rust-clippy/wiki#cast_precision_loss)               | allow   | casts that cause loss of precision, e.g `x as f32` where `x: u64`
  21 [cast_sign_loss](https://github.com/Manishearth/rust-clippy/wiki#cast_sign_loss)                         | allow   | casts from signed types to unsigned types, e.g `x as u32` where `x: i32`
  22 [cmp_nan](https://github.com/Manishearth/rust-clippy/wiki#cmp_nan)                                       | deny    | comparisons to NAN (which will always return false, which is probably not intended)
  23 [cmp_owned](https://github.com/Manishearth/rust-clippy/wiki#cmp_owned)                                   | warn    | creating owned instances for comparing with others, e.g. `x == "foo".to_string()`
  24 [collapsible_if](https://github.com/Manishearth/rust-clippy/wiki#collapsible_if)                         | warn    | two nested `if`-expressions can be collapsed into one, e.g. `if x { if y { foo() } }` can be written as `if x && y { foo() }`
  25 [empty_loop](https://github.com/Manishearth/rust-clippy/wiki#empty_loop)                                 | warn    | empty `loop {}` detected
  26 [eq_op](https://github.com/Manishearth/rust-clippy/wiki#eq_op)                                           | warn    | equal operands on both sides of a comparison or bitwise combination (e.g. `x == x`)
  27 [explicit_counter_loop](https://github.com/Manishearth/rust-clippy/wiki#explicit_counter_loop)           | warn    | for-looping with an explicit counter when `_.enumerate()` would do
  28 [explicit_iter_loop](https://github.com/Manishearth/rust-clippy/wiki#explicit_iter_loop)                 | warn    | for-looping over `_.iter()` or `_.iter_mut()` when `&_` or `&mut _` would do
  29 [float_cmp](https://github.com/Manishearth/rust-clippy/wiki#float_cmp)                                   | warn    | using `==` or `!=` on float values (as floating-point operations usually involve rounding errors, it is always better to check for approximate equality within small bounds)
  30 [identity_op](https://github.com/Manishearth/rust-clippy/wiki#identity_op)                               | warn    | using identity operations, e.g. `x + 0` or `y / 1`
  31 [ineffective_bit_mask](https://github.com/Manishearth/rust-clippy/wiki#ineffective_bit_mask)             | warn    | expressions where a bit mask will be rendered useless by a comparison, e.g. `(x | 1) > 2`
  32 [inline_always](https://github.com/Manishearth/rust-clippy/wiki#inline_always)                           | warn    | `#[inline(always)]` is a bad idea in most cases
  33 [iter_next_loop](https://github.com/Manishearth/rust-clippy/wiki#iter_next_loop)                         | warn    | for-looping over `_.next()` which is probably not intended
  34 [len_without_is_empty](https://github.com/Manishearth/rust-clippy/wiki#len_without_is_empty)             | warn    | traits and impls that have `.len()` but not `.is_empty()`
  35 [len_zero](https://github.com/Manishearth/rust-clippy/wiki#len_zero)                                     | warn    | checking `.len() == 0` or `.len() > 0` (or similar) when `.is_empty()` could be used instead
  36 [let_and_return](https://github.com/Manishearth/rust-clippy/wiki#let_and_return)                         | warn    | creating a let-binding and then immediately returning it like `let x = expr; x` at the end of a block
  37 [let_unit_value](https://github.com/Manishearth/rust-clippy/wiki#let_unit_value)                         | warn    | creating a let binding to a value of unit type, which usually can't be used afterwards
  38 [linkedlist](https://github.com/Manishearth/rust-clippy/wiki#linkedlist)                                 | warn    | usage of LinkedList, usually a vector is faster, or a more specialized data structure like a VecDeque
  39 [map_clone](https://github.com/Manishearth/rust-clippy/wiki#map_clone)                                   | warn    | using `.map(|x| x.clone())` to clone an iterator or option's contents (recommends `.cloned()` instead)
  40 [match_bool](https://github.com/Manishearth/rust-clippy/wiki#match_bool)                                 | warn    | a match on boolean expression; recommends `if..else` block instead
  41 [match_ref_pats](https://github.com/Manishearth/rust-clippy/wiki#match_ref_pats)                         | warn    | a match has all arms prefixed with `&`; the match expression can be dereferenced instead
  42 [min_max](https://github.com/Manishearth/rust-clippy/wiki#min_max)                                       | warn    | `min(_, max(_, _))` (or vice versa) with bounds clamping the result to a constant
  43 [modulo_one](https://github.com/Manishearth/rust-clippy/wiki#modulo_one)                                 | warn    | taking a number modulo 1, which always returns 0
  44 [mut_mut](https://github.com/Manishearth/rust-clippy/wiki#mut_mut)                                       | allow   | usage of double-mut refs, e.g. `&mut &mut ...` (either copy'n'paste error, or shows a fundamental misunderstanding of references)
  45 [mutex_atomic](https://github.com/Manishearth/rust-clippy/wiki#mutex_atomic)                             | warn    | using a Mutex where an atomic value could be used instead
  46 [mutex_integer](https://github.com/Manishearth/rust-clippy/wiki#mutex_integer)                           | allow   | using a Mutex for an integer type
  47 [needless_bool](https://github.com/Manishearth/rust-clippy/wiki#needless_bool)                           | warn    | if-statements with plain booleans in the then- and else-clause, e.g. `if p { true } else { false }`
  48 [needless_lifetimes](https://github.com/Manishearth/rust-clippy/wiki#needless_lifetimes)                 | warn    | using explicit lifetimes for references in function arguments when elision rules would allow omitting them
  49 [needless_range_loop](https://github.com/Manishearth/rust-clippy/wiki#needless_range_loop)               | warn    | for-looping over a range of indices where an iterator over items would do
  50 [needless_return](https://github.com/Manishearth/rust-clippy/wiki#needless_return)                       | warn    | using a return statement like `return expr;` where an expression would suffice
  51 [needless_update](https://github.com/Manishearth/rust-clippy/wiki#needless_update)                       | warn    | using `{ ..base }` when there are no missing fields
  52 [no_effect](https://github.com/Manishearth/rust-clippy/wiki#no_effect)                                   | warn    | statements with no effect
  53 [non_ascii_literal](https://github.com/Manishearth/rust-clippy/wiki#non_ascii_literal)                   | allow   | using any literal non-ASCII chars in a string literal; suggests using the \\u escape instead
  54 [nonsensical_open_options](https://github.com/Manishearth/rust-clippy/wiki#nonsensical_open_options)     | warn    | nonsensical combination of options for opening a file
  55 [ok_expect](https://github.com/Manishearth/rust-clippy/wiki#ok_expect)                                   | warn    | using `ok().expect()`, which gives worse error messages than calling `expect` directly on the Result
  56 [option_unwrap_used](https://github.com/Manishearth/rust-clippy/wiki#option_unwrap_used)                 | allow   | using `Option.unwrap()`, which should at least get a better message using `expect()`
  57 [precedence](https://github.com/Manishearth/rust-clippy/wiki#precedence)                                 | warn    | catches operations where precedence may be unclear. See the wiki for a list of cases caught
  58 [ptr_arg](https://github.com/Manishearth/rust-clippy/wiki#ptr_arg)                                       | warn    | fn arguments of the type `&Vec<...>` or `&String`, suggesting to use `&[...]` or `&str` instead, respectively
  59 [range_step_by_zero](https://github.com/Manishearth/rust-clippy/wiki#range_step_by_zero)                 | warn    | using Range::step_by(0), which produces an infinite iterator
  60 [range_zip_with_len](https://github.com/Manishearth/rust-clippy/wiki#range_zip_with_len)                 | warn    | zipping iterator with a range when enumerate() would do
  61 [redundant_closure](https://github.com/Manishearth/rust-clippy/wiki#redundant_closure)                   | warn    | using redundant closures, i.e. `|a| foo(a)` (which can be written as just `foo`)
  62 [redundant_pattern](https://github.com/Manishearth/rust-clippy/wiki#redundant_pattern)                   | warn    | using `name @ _` in a pattern
  63 [result_unwrap_used](https://github.com/Manishearth/rust-clippy/wiki#result_unwrap_used)                 | allow   | using `Result.unwrap()`, which might be better handled
  64 [reverse_range_loop](https://github.com/Manishearth/rust-clippy/wiki#reverse_range_loop)                 | warn    | Iterating over an empty range, such as `10..0` or `5..5`
  65 [shadow_reuse](https://github.com/Manishearth/rust-clippy/wiki#shadow_reuse)                             | allow   | rebinding a name to an expression that re-uses the original value, e.g. `let x = x + 1`
  66 [shadow_same](https://github.com/Manishearth/rust-clippy/wiki#shadow_same)                               | allow   | rebinding a name to itself, e.g. `let mut x = &mut x`
  67 [shadow_unrelated](https://github.com/Manishearth/rust-clippy/wiki#shadow_unrelated)                     | allow   | The name is re-bound without even using the original value
  68 [should_implement_trait](https://github.com/Manishearth/rust-clippy/wiki#should_implement_trait)         | warn    | defining a method that should be implementing a std trait
  69 [single_match](https://github.com/Manishearth/rust-clippy/wiki#single_match)                             | warn    | a match statement with a single nontrivial arm (i.e, where the other arm is `_ => {}`) is used; recommends `if let` instead
  70 [str_to_string](https://github.com/Manishearth/rust-clippy/wiki#str_to_string)                           | warn    | using `to_string()` on a str, which should be `to_owned()`
  71 [string_add](https://github.com/Manishearth/rust-clippy/wiki#string_add)                                 | allow   | using `x + ..` where x is a `String`; suggests using `push_str()` instead
  72 [string_add_assign](https://github.com/Manishearth/rust-clippy/wiki#string_add_assign)                   | allow   | using `x = x + ..` where x is a `String`; suggests using `push_str()` instead
  73 [string_to_string](https://github.com/Manishearth/rust-clippy/wiki#string_to_string)                     | warn    | calling `String.to_string()` which is a no-op
  74 [temporary_assignment](https://github.com/Manishearth/rust-clippy/wiki#temporary_assignment)             | warn    | assignments to temporaries
  75 [toplevel_ref_arg](https://github.com/Manishearth/rust-clippy/wiki#toplevel_ref_arg)                     | warn    | An entire binding was declared as `ref`, in a function argument (`fn foo(ref x: Bar)`), or a `let` statement (`let ref x = foo()`). In such cases, it is preferred to take references with `&`.
  76 [type_complexity](https://github.com/Manishearth/rust-clippy/wiki#type_complexity)                       | warn    | usage of very complex types; recommends factoring out parts into `type` definitions
  77 [unicode_not_nfc](https://github.com/Manishearth/rust-clippy/wiki#unicode_not_nfc)                       | allow   | using a unicode literal not in NFC normal form (see http://www.unicode.org/reports/tr15/ for further information)
  78 [unit_cmp](https://github.com/Manishearth/rust-clippy/wiki#unit_cmp)                                     | warn    | comparing unit values (which is always `true` or `false`, respectively)
  79 [unnecessary_mut_passed](https://github.com/Manishearth/rust-clippy/wiki#unnecessary_mut_passed)         | warn    | an argument is passed as a mutable reference although the function/method only demands an immutable reference
  80 [unstable_as_mut_slice](https://github.com/Manishearth/rust-clippy/wiki#unstable_as_mut_slice)           | warn    | as_mut_slice is not stable and can be replaced by &mut v[..]see https://github.com/rust-lang/rust/issues/27729
  81 [unstable_as_slice](https://github.com/Manishearth/rust-clippy/wiki#unstable_as_slice)                   | warn    | as_slice is not stable and can be replaced by & v[..]see https://github.com/rust-lang/rust/issues/27729
  82 [unused_collect](https://github.com/Manishearth/rust-clippy/wiki#unused_collect)                         | warn    | `collect()`ing an iterator without using the result; this is usually better written as a for loop
  83 [useless_transmute](https://github.com/Manishearth/rust-clippy/wiki#useless_transmute)                   | warn    | transmutes that have the same to and from types
  84 [while_let_loop](https://github.com/Manishearth/rust-clippy/wiki#while_let_loop)                         | warn    | `loop { if let { ... } else break }` can be written as a `while let` loop
  85 [while_let_on_iterator](https://github.com/Manishearth/rust-clippy/wiki#while_let_on_iterator)           | warn    | using a while-let loop instead of a for loop on an iterator
  86 [wrong_pub_self_convention](https://github.com/Manishearth/rust-clippy/wiki#wrong_pub_self_convention)   | allow   | defining a public method named with an established prefix (like "into_") that takes `self` with the wrong convention
  87 [wrong_self_convention](https://github.com/Manishearth/rust-clippy/wiki#wrong_self_convention)           | warn    | defining a method named with an established prefix (like "into_") that takes `self` with the wrong convention
  88 [zero_divided_by_zero](https://github.com/Manishearth/rust-clippy/wiki#zero_divided_by_zero)             | warn    | usage of `0.0 / 0.0` to obtain NaN instead of std::f32::NaN or std::f64::NaN
  89 [zero_width_space](https://github.com/Manishearth/rust-clippy/wiki#zero_width_space)                     | deny    | using a zero-width space in a string literal, which is confusing
  90
  91 More to come, please [file an issue](https://github.com/Manishearth/rust-clippy/issues) if you have ideas!
  92
  93 ##Usage
  94
  95 Compiler plugins are highly unstable and will only work with a nightly Rust for now. Since stable Rust is backwards compatible, you should be able to compile your stable programs with nightly Rust with clippy plugged in to circumvent this.
  96
  97 Add in your `Cargo.toml`:
  98 ```toml
  99 [dependencies]
 100 clippy = "*"
 101 ```
 102
 103 You may also use [`cargo clippy`](https://github.com/arcnmx/cargo-clippy), a custom cargo subcommand that runs clippy on a given project.
 104
 105 Sample `main.rs`:
 106 ```rust
 107 #![feature(plugin)]
 108
 109 #![plugin(clippy)]
 110
 111
 112 fn main(){
 113     let x = Some(1u8);
 114     match x {
 115         Some(y) => println!("{:?}", y),
 116         _ => ()
 117     }
 118 }
 119 ```
 120
 121 Produces this warning:
 122 ```
 123 src/main.rs:8:5: 11:6 warning: you seem to be trying to use match for destructuring a single type. Consider using `if let`, #[warn(single_match)] on by default
 124 src/main.rs:8     match x {
 125 src/main.rs:9         Some(y) => println!("{:?}", y),
 126 src/main.rs:10         _ => ()
 127 src/main.rs:11     }
 128 src/main.rs:8:5: 11:6 help: Try
 129 if let Some(y) = x { println!("{:?}", y) }
 130 ```
 131
 132 You can add options  to `allow`/`warn`/`deny`:
 133 - the whole set of `Warn` lints using the `clippy` lint group (`#![deny(clippy)]`)
 134 - all lints using both the `clippy` and `clippy_pedantic` lint groups (`#![deny(clippy)]`, `#![deny(clippy_pedantic)]`). Note that `clippy_pedantic` contains some very aggressive lints prone to false positives.
 135 - only some lints (`#![deny(single_match, box_vec)]`, etc)
 136 - `allow`/`warn`/`deny` can be limited to a single function or module using `#[allow(...)]`, etc
 137
 138 Note: `deny` produces errors instead of warnings
 139
 140 To have cargo compile your crate with clippy without needing `#![plugin(clippy)]`
 141 in your code, you can use:
 142
 143 ```
 144 cargo rustc -- -L /path/to/clippy_so -Z extra-plugins=clippy
 145 ```
 146
 147 *[Note](https://github.com/Manishearth/rust-clippy/wiki#a-word-of-warning):* Be sure that clippy was compiled with the same version of rustc that cargo invokes here!
 148
 149 If you want to make clippy an optional dependency, you can do the following:
 150
 151 In your `Cargo.toml`:
 152 ```toml
 153 [dependencies]
 154 clippy = {version = "*", optional = true}
 155
 156 [features]
 157 default=[]
 158 ```
 159
 160 And, in your `main.rs` or `lib.rs`:
 161
 162 ```rust
 163 #![cfg_attr(feature="clippy", feature(plugin))]
 164
 165 #![cfg_attr(feature="clippy", plugin(clippy))]
 166 ```
 167
 168 ##License
 169 Licensed under [MPL](https://www.mozilla.org/MPL/2.0/). If you're having issues with the license, let me know and I'll try to change it to something more permissive.