# rust-clippy
-[](https://travis-ci.org/Manishearth/rust-clippy)
-[](https://ci.appveyor.com/project/Manishearth/rust-clippy)
-[](http://clippy.bashy.io/github/Manishearth/rust-clippy/master/log)
+[](https://travis-ci.org/rust-lang-nursery/rust-clippy)
+[](https://ci.appveyor.com/project/rust-lang-nursery/rust-clippy)
+[](http://clippy.bashy.io/github/rust-lang-nursery/rust-clippy/master/log)
[](https://crates.io/crates/clippy)
[](#License)
Instead of adding the `cfg_attr` attributes you can also run clippy on demand:
`cargo rustc --features clippy -- -Z no-trans -Z extra-plugins=clippy`
-(the `-Z no trans`, while not neccessary, will stop the compilation process after
+(the `-Z no trans`, while not necessary, will stop the compilation process after
typechecking (and lints) have completed, which can significantly reduce the runtime).
### As a cargo subcommand (`cargo clippy`)
in your code, you can use:
```terminal
-cargo rustc -- -L /path/to/clippy_so -Z extra-plugins=clippy
+cargo rustc -- -L /path/to/clippy_so/dir/ -Z extra-plugins=clippy
```
-*[Note](https://github.com/Manishearth/rust-clippy/wiki#a-word-of-warning):*
+*[Note](https://github.com/rust-lang-nursery/rust-clippy/wiki#a-word-of-warning):*
Be sure that clippy was compiled with the same version of rustc that cargo invokes here!
### As a Compiler Plugin
## Lints
-There are 186 lints included in this crate:
-
-name | default | triggers on
------------------------------------------------------------------------------------------------------------------------|---------|----------------------------------------------------------------------------------------------------------------------------------
-[absurd_extreme_comparisons](https://github.com/Manishearth/rust-clippy/wiki#absurd_extreme_comparisons) | warn | a comparison with a maximum or minimum value that is always true or false
-[almost_swapped](https://github.com/Manishearth/rust-clippy/wiki#almost_swapped) | warn | `foo = bar; bar = foo` sequence
-[approx_constant](https://github.com/Manishearth/rust-clippy/wiki#approx_constant) | warn | the approximate of a known float constant (in `std::fXX::consts`)
-[assign_op_pattern](https://github.com/Manishearth/rust-clippy/wiki#assign_op_pattern) | warn | assigning the result of an operation on a variable to that same variable
-[assign_ops](https://github.com/Manishearth/rust-clippy/wiki#assign_ops) | allow | any compound assignment operation
-[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`
-[blacklisted_name](https://github.com/Manishearth/rust-clippy/wiki#blacklisted_name) | warn | usage of a blacklisted/placeholder name
-[block_in_if_condition_expr](https://github.com/Manishearth/rust-clippy/wiki#block_in_if_condition_expr) | warn | braces that can be eliminated in conditions, e.g `if { true } ...`
-[block_in_if_condition_stmt](https://github.com/Manishearth/rust-clippy/wiki#block_in_if_condition_stmt) | warn | complex blocks in conditions, e.g. `if { let x = true; x } ...`
-[bool_comparison](https://github.com/Manishearth/rust-clippy/wiki#bool_comparison) | warn | comparing a variable to a boolean, e.g. `if x == true`
-[box_vec](https://github.com/Manishearth/rust-clippy/wiki#box_vec) | warn | usage of `Box<Vec<T>>`, vector elements are already on the heap
-[boxed_local](https://github.com/Manishearth/rust-clippy/wiki#boxed_local) | warn | using `Box<T>` where unnecessary
-[builtin_type_shadow](https://github.com/Manishearth/rust-clippy/wiki#builtin_type_shadow) | warn | shadowing a builtin type
-[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`
-[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`
-[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`
-[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`
-[char_lit_as_u8](https://github.com/Manishearth/rust-clippy/wiki#char_lit_as_u8) | warn | casting a character literal to u8
-[chars_next_cmp](https://github.com/Manishearth/rust-clippy/wiki#chars_next_cmp) | warn | using `.chars().next()` to check if a string starts with a char
-[clone_double_ref](https://github.com/Manishearth/rust-clippy/wiki#clone_double_ref) | warn | using `clone` on `&&T`
-[clone_on_copy](https://github.com/Manishearth/rust-clippy/wiki#clone_on_copy) | warn | using `clone` on a `Copy` type
-[cmp_nan](https://github.com/Manishearth/rust-clippy/wiki#cmp_nan) | deny | comparisons to NAN, which will always return false, probably not intended
-[cmp_null](https://github.com/Manishearth/rust-clippy/wiki#cmp_null) | warn | comparing a pointer to a null pointer, suggesting to use `.is_null()` instead.
-[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()`
-[collapsible_if](https://github.com/Manishearth/rust-clippy/wiki#collapsible_if) | warn | `if`s that can be collapsed (e.g. `if x { if y { ... } }` and `else { if x { ... } }`)
-[crosspointer_transmute](https://github.com/Manishearth/rust-clippy/wiki#crosspointer_transmute) | warn | transmutes that have to or from types that are a pointer to the other
-[cyclomatic_complexity](https://github.com/Manishearth/rust-clippy/wiki#cyclomatic_complexity) | warn | functions that should be split up into multiple functions
-[deprecated_semver](https://github.com/Manishearth/rust-clippy/wiki#deprecated_semver) | warn | use of `#[deprecated(since = "x")]` where x is not semver
-[deref_addrof](https://github.com/Manishearth/rust-clippy/wiki#deref_addrof) | warn | use of `*&` or `*&mut` in an expression
-[derive_hash_xor_eq](https://github.com/Manishearth/rust-clippy/wiki#derive_hash_xor_eq) | warn | deriving `Hash` but implementing `PartialEq` explicitly
-[diverging_sub_expression](https://github.com/Manishearth/rust-clippy/wiki#diverging_sub_expression) | warn | whether an expression contains a diverging sub expression
-[doc_markdown](https://github.com/Manishearth/rust-clippy/wiki#doc_markdown) | warn | presence of `_`, `::` or camel-case outside backticks in documentation
-[double_neg](https://github.com/Manishearth/rust-clippy/wiki#double_neg) | warn | `--x`, which is a double negation of `x` and not a pre-decrement as in C/C++
-[double_parens](https://github.com/Manishearth/rust-clippy/wiki#double_parens) | warn | Warn on unnecessary double parentheses
-[drop_ref](https://github.com/Manishearth/rust-clippy/wiki#drop_ref) | warn | calls to `std::mem::drop` with a reference instead of an owned value
-[duplicate_underscore_argument](https://github.com/Manishearth/rust-clippy/wiki#duplicate_underscore_argument) | warn | function arguments having names which only differ by an underscore
-[empty_enum](https://github.com/Manishearth/rust-clippy/wiki#empty_enum) | allow | enum with no variants
-[empty_loop](https://github.com/Manishearth/rust-clippy/wiki#empty_loop) | warn | empty `loop {}`, which should block or sleep
-[enum_clike_unportable_variant](https://github.com/Manishearth/rust-clippy/wiki#enum_clike_unportable_variant) | warn | C-like enums that are `repr(isize/usize)` and have values that don't fit into an `i32`
-[enum_glob_use](https://github.com/Manishearth/rust-clippy/wiki#enum_glob_use) | allow | use items that import all variants of an enum
-[enum_variant_names](https://github.com/Manishearth/rust-clippy/wiki#enum_variant_names) | warn | enums where all variants share a prefix/postfix
-[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`)
-[eval_order_dependence](https://github.com/Manishearth/rust-clippy/wiki#eval_order_dependence) | warn | whether a variable read occurs before a write depends on sub-expression evaluation order
-[expl_impl_clone_on_copy](https://github.com/Manishearth/rust-clippy/wiki#expl_impl_clone_on_copy) | warn | implementing `Clone` explicitly on `Copy` types
-[explicit_counter_loop](https://github.com/Manishearth/rust-clippy/wiki#explicit_counter_loop) | warn | for-looping with an explicit counter when `_.enumerate()` would do
-[explicit_into_iter_loop](https://github.com/Manishearth/rust-clippy/wiki#explicit_into_iter_loop) | warn | for-looping over `_.into_iter()` when `_` would do
-[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
-[filter_map](https://github.com/Manishearth/rust-clippy/wiki#filter_map) | allow | using combinations of `filter`, `map`, `filter_map` and `flat_map` which can usually be written as a single method call
-[filter_next](https://github.com/Manishearth/rust-clippy/wiki#filter_next) | warn | using `filter(p).next()`, which is more succinctly expressed as `.find(p)`
-[float_arithmetic](https://github.com/Manishearth/rust-clippy/wiki#float_arithmetic) | allow | any floating-point arithmetic statement
-[float_cmp](https://github.com/Manishearth/rust-clippy/wiki#float_cmp) | warn | using `==` or `!=` on float values instead of comparing difference with an epsilon
-[for_kv_map](https://github.com/Manishearth/rust-clippy/wiki#for_kv_map) | warn | looping on a map using `iter` when `keys` or `values` would do
-[for_loop_over_option](https://github.com/Manishearth/rust-clippy/wiki#for_loop_over_option) | warn | for-looping over an `Option`, which is more clearly expressed as an `if let`
-[for_loop_over_result](https://github.com/Manishearth/rust-clippy/wiki#for_loop_over_result) | warn | for-looping over a `Result`, which is more clearly expressed as an `if let`
-[forget_ref](https://github.com/Manishearth/rust-clippy/wiki#forget_ref) | warn | calls to `std::mem::forget` with a reference instead of an owned value
-[get_unwrap](https://github.com/Manishearth/rust-clippy/wiki#get_unwrap) | warn | using `.get().unwrap()` or `.get_mut().unwrap()` when using `[]` would work instead
-[identity_op](https://github.com/Manishearth/rust-clippy/wiki#identity_op) | warn | using identity operations, e.g. `x + 0` or `y / 1`
-[if_let_redundant_pattern_matching](https://github.com/Manishearth/rust-clippy/wiki#if_let_redundant_pattern_matching) | warn | use the proper utility function avoiding an `if let`
-[if_let_some_result](https://github.com/Manishearth/rust-clippy/wiki#if_let_some_result) | warn | usage of `ok()` in `if let Some(pat)` statements is unnecessary, match on `Ok(pat)` instead
-[if_not_else](https://github.com/Manishearth/rust-clippy/wiki#if_not_else) | allow | `if` branches that could be swapped so no negation operation is necessary on the condition
-[if_same_then_else](https://github.com/Manishearth/rust-clippy/wiki#if_same_then_else) | warn | if with the same *then* and *else* blocks
-[ifs_same_cond](https://github.com/Manishearth/rust-clippy/wiki#ifs_same_cond) | warn | consecutive `ifs` with the same condition
-[indexing_slicing](https://github.com/Manishearth/rust-clippy/wiki#indexing_slicing) | allow | indexing/slicing usage
-[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`
-[inline_always](https://github.com/Manishearth/rust-clippy/wiki#inline_always) | warn | use of `#[inline(always)]`
-[integer_arithmetic](https://github.com/Manishearth/rust-clippy/wiki#integer_arithmetic) | allow | any integer arithmetic statement
-[invalid_regex](https://github.com/Manishearth/rust-clippy/wiki#invalid_regex) | deny | invalid regular expressions
-[invalid_upcast_comparisons](https://github.com/Manishearth/rust-clippy/wiki#invalid_upcast_comparisons) | allow | a comparison involving an upcast which is always true or false
-[items_after_statements](https://github.com/Manishearth/rust-clippy/wiki#items_after_statements) | allow | blocks where an item comes after a statement
-[iter_next_loop](https://github.com/Manishearth/rust-clippy/wiki#iter_next_loop) | warn | for-looping over `_.next()` which is probably not intended
-[iter_nth](https://github.com/Manishearth/rust-clippy/wiki#iter_nth) | warn | using `.iter().nth()` on a standard library type with O(1) element access
-[iter_skip_next](https://github.com/Manishearth/rust-clippy/wiki#iter_skip_next) | warn | using `.skip(x).next()` on an iterator
-[large_enum_variant](https://github.com/Manishearth/rust-clippy/wiki#large_enum_variant) | warn | large size difference between variants on an enum
-[len_without_is_empty](https://github.com/Manishearth/rust-clippy/wiki#len_without_is_empty) | warn | traits or impls with a public `len` method but no corresponding `is_empty` method
-[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
-[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
-[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
-[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
-[logic_bug](https://github.com/Manishearth/rust-clippy/wiki#logic_bug) | warn | boolean expressions that contain terminals which can be eliminated
-[manual_swap](https://github.com/Manishearth/rust-clippy/wiki#manual_swap) | warn | manual swap of two variables
-[many_single_char_names](https://github.com/Manishearth/rust-clippy/wiki#many_single_char_names) | warn | too many single character bindings
-[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
-[map_entry](https://github.com/Manishearth/rust-clippy/wiki#map_entry) | warn | use of `contains_key` followed by `insert` on a `HashMap` or `BTreeMap`
-[match_bool](https://github.com/Manishearth/rust-clippy/wiki#match_bool) | warn | a match on a boolean expression instead of an `if..else` block
-[match_overlapping_arm](https://github.com/Manishearth/rust-clippy/wiki#match_overlapping_arm) | warn | a match with overlapping arms
-[match_ref_pats](https://github.com/Manishearth/rust-clippy/wiki#match_ref_pats) | warn | a match or `if let` with all arms prefixed with `&` instead of deref-ing the match expression
-[match_same_arms](https://github.com/Manishearth/rust-clippy/wiki#match_same_arms) | warn | `match` with identical arm bodies
-[mem_forget](https://github.com/Manishearth/rust-clippy/wiki#mem_forget) | allow | `mem::forget` usage on `Drop` types, likely to cause memory leaks
-[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
-[misrefactored_assign_op](https://github.com/Manishearth/rust-clippy/wiki#misrefactored_assign_op) | warn | having a variable on both sides of an assign op
-[missing_docs_in_private_items](https://github.com/Manishearth/rust-clippy/wiki#missing_docs_in_private_items) | allow | detects missing documentation for public and private members
-[mixed_case_hex_literals](https://github.com/Manishearth/rust-clippy/wiki#mixed_case_hex_literals) | warn | hex literals whose letter digits are not consistently upper- or lowercased
-[module_inception](https://github.com/Manishearth/rust-clippy/wiki#module_inception) | warn | modules that have the same name as their parent module
-[modulo_one](https://github.com/Manishearth/rust-clippy/wiki#modulo_one) | warn | taking a number modulo 1, which always returns 0
-[mut_mut](https://github.com/Manishearth/rust-clippy/wiki#mut_mut) | allow | usage of double-mut refs, e.g. `&mut &mut ...`
-[mutex_atomic](https://github.com/Manishearth/rust-clippy/wiki#mutex_atomic) | warn | using a mutex where an atomic value could be used instead
-[mutex_integer](https://github.com/Manishearth/rust-clippy/wiki#mutex_integer) | allow | using a mutex for an integer type
-[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 }`
-[needless_borrow](https://github.com/Manishearth/rust-clippy/wiki#needless_borrow) | warn | taking a reference that is going to be automatically dereferenced
-[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
-[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
-[needless_return](https://github.com/Manishearth/rust-clippy/wiki#needless_return) | warn | using a return statement like `return expr;` where an expression would suffice
-[needless_update](https://github.com/Manishearth/rust-clippy/wiki#needless_update) | warn | using `Foo { ..base }` when there are no missing fields
-[neg_multiply](https://github.com/Manishearth/rust-clippy/wiki#neg_multiply) | warn | multiplying integers with -1
-[new_ret_no_self](https://github.com/Manishearth/rust-clippy/wiki#new_ret_no_self) | warn | not returning `Self` in a `new` method
-[new_without_default](https://github.com/Manishearth/rust-clippy/wiki#new_without_default) | warn | `fn new() -> Self` method without `Default` implementation
-[new_without_default_derive](https://github.com/Manishearth/rust-clippy/wiki#new_without_default_derive) | warn | `fn new() -> Self` without `#[derive]`able `Default` implementation
-[no_effect](https://github.com/Manishearth/rust-clippy/wiki#no_effect) | warn | statements with no effect
-[non_ascii_literal](https://github.com/Manishearth/rust-clippy/wiki#non_ascii_literal) | allow | using any literal non-ASCII chars in a string literal instead of using the `\\u` escape
-[nonminimal_bool](https://github.com/Manishearth/rust-clippy/wiki#nonminimal_bool) | allow | boolean expressions that can be written more concisely
-[nonsensical_open_options](https://github.com/Manishearth/rust-clippy/wiki#nonsensical_open_options) | warn | nonsensical combination of options for opening a file
-[not_unsafe_ptr_arg_deref](https://github.com/Manishearth/rust-clippy/wiki#not_unsafe_ptr_arg_deref) | warn | public functions dereferencing raw pointer arguments but not marked `unsafe`
-[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
-[option_map_unwrap_or](https://github.com/Manishearth/rust-clippy/wiki#option_map_unwrap_or) | allow | using `Option.map(f).unwrap_or(a)`, which is more succinctly expressed as `map_or(a, f)`
-[option_map_unwrap_or_else](https://github.com/Manishearth/rust-clippy/wiki#option_map_unwrap_or_else) | allow | using `Option.map(f).unwrap_or_else(g)`, which is more succinctly expressed as `map_or_else(g, f)`
-[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()`
-[or_fun_call](https://github.com/Manishearth/rust-clippy/wiki#or_fun_call) | warn | using any `*or` method with a function call, which suggests `*or_else`
-[out_of_bounds_indexing](https://github.com/Manishearth/rust-clippy/wiki#out_of_bounds_indexing) | deny | out of bounds constant indexing
-[overflow_check_conditional](https://github.com/Manishearth/rust-clippy/wiki#overflow_check_conditional) | warn | overflow checks inspired by C which are likely to panic
-[panic_params](https://github.com/Manishearth/rust-clippy/wiki#panic_params) | warn | missing parameters in `panic!` calls
-[partialeq_ne_impl](https://github.com/Manishearth/rust-clippy/wiki#partialeq_ne_impl) | warn | re-implementing `PartialEq::ne`
-[possible_missing_comma](https://github.com/Manishearth/rust-clippy/wiki#possible_missing_comma) | warn | possible missing comma in array
-[precedence](https://github.com/Manishearth/rust-clippy/wiki#precedence) | warn | operations where precedence may be unclear
-[print_stdout](https://github.com/Manishearth/rust-clippy/wiki#print_stdout) | allow | printing on stdout
-[print_with_newline](https://github.com/Manishearth/rust-clippy/wiki#print_with_newline) | warn | using `print!()` with a format string that ends in a newline
-[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
-[pub_enum_variant_names](https://github.com/Manishearth/rust-clippy/wiki#pub_enum_variant_names) | allow | enums where all variants share a prefix/postfix
-[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
-[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
-[redundant_closure](https://github.com/Manishearth/rust-clippy/wiki#redundant_closure) | warn | redundant closures, i.e. `|a| foo(a)` (which can be written as just `foo`)
-[redundant_closure_call](https://github.com/Manishearth/rust-clippy/wiki#redundant_closure_call) | warn | throwaway closures called in the expression they are defined
-[redundant_pattern](https://github.com/Manishearth/rust-clippy/wiki#redundant_pattern) | warn | using `name @ _` in a pattern
-[regex_macro](https://github.com/Manishearth/rust-clippy/wiki#regex_macro) | warn | use of `regex!(_)` instead of `Regex::new(_)`
-[result_unwrap_used](https://github.com/Manishearth/rust-clippy/wiki#result_unwrap_used) | allow | using `Result.unwrap()`, which might be better handled
-[reverse_range_loop](https://github.com/Manishearth/rust-clippy/wiki#reverse_range_loop) | warn | iteration over an empty range, such as `10..0` or `5..5`
-[search_is_some](https://github.com/Manishearth/rust-clippy/wiki#search_is_some) | warn | using an iterator search followed by `is_some()`, which is more succinctly expressed as a call to `any()`
-[serde_api_misuse](https://github.com/Manishearth/rust-clippy/wiki#serde_api_misuse) | warn | various things that will negatively affect your serde experience
-[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`
-[shadow_same](https://github.com/Manishearth/rust-clippy/wiki#shadow_same) | allow | rebinding a name to itself, e.g. `let mut x = &mut x`
-[shadow_unrelated](https://github.com/Manishearth/rust-clippy/wiki#shadow_unrelated) | allow | rebinding a name without even using the original value
-[short_circuit_statement](https://github.com/Manishearth/rust-clippy/wiki#short_circuit_statement) | warn | using a short circuit boolean condition as a statement
-[should_implement_trait](https://github.com/Manishearth/rust-clippy/wiki#should_implement_trait) | warn | defining a method that should be implementing a std trait
-[similar_names](https://github.com/Manishearth/rust-clippy/wiki#similar_names) | allow | similarly named items and bindings
-[single_char_pattern](https://github.com/Manishearth/rust-clippy/wiki#single_char_pattern) | warn | using a single-character str where a char could be used, e.g. `_.split("x")`
-[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 `_ => {}`) instead of `if let`
-[single_match_else](https://github.com/Manishearth/rust-clippy/wiki#single_match_else) | allow | a match statement with a two arms where the second arm's pattern is a wildcard instead of `if let`
-[string_add](https://github.com/Manishearth/rust-clippy/wiki#string_add) | allow | using `x + ..` where x is a `String` instead of `push_str()`
-[string_add_assign](https://github.com/Manishearth/rust-clippy/wiki#string_add_assign) | allow | using `x = x + ..` where x is a `String` instead of `push_str()`
-[string_extend_chars](https://github.com/Manishearth/rust-clippy/wiki#string_extend_chars) | warn | using `x.extend(s.chars())` where s is a `&str` or `String`
-[string_lit_as_bytes](https://github.com/Manishearth/rust-clippy/wiki#string_lit_as_bytes) | warn | calling `as_bytes` on a string literal instead of using a byte string literal
-[stutter](https://github.com/Manishearth/rust-clippy/wiki#stutter) | allow | type names prefixed/postfixed with their containing module's name
-[suspicious_assignment_formatting](https://github.com/Manishearth/rust-clippy/wiki#suspicious_assignment_formatting) | warn | suspicious formatting of `*=`, `-=` or `!=`
-[suspicious_else_formatting](https://github.com/Manishearth/rust-clippy/wiki#suspicious_else_formatting) | warn | suspicious formatting of `else if`
-[temporary_assignment](https://github.com/Manishearth/rust-clippy/wiki#temporary_assignment) | warn | assignments to temporaries
-[temporary_cstring_as_ptr](https://github.com/Manishearth/rust-clippy/wiki#temporary_cstring_as_ptr) | warn | getting the inner pointer of a temporary `CString`
-[too_many_arguments](https://github.com/Manishearth/rust-clippy/wiki#too_many_arguments) | warn | functions with too many arguments
-[toplevel_ref_arg](https://github.com/Manishearth/rust-clippy/wiki#toplevel_ref_arg) | warn | an entire binding declared as `ref`, in a function argument or a `let` statement
-[transmute_ptr_to_ref](https://github.com/Manishearth/rust-clippy/wiki#transmute_ptr_to_ref) | warn | transmutes from a pointer to a reference type
-[trivial_regex](https://github.com/Manishearth/rust-clippy/wiki#trivial_regex) | warn | trivial regular expressions
-[type_complexity](https://github.com/Manishearth/rust-clippy/wiki#type_complexity) | warn | usage of very complex types that might be better factored into `type` definitions
-[unicode_not_nfc](https://github.com/Manishearth/rust-clippy/wiki#unicode_not_nfc) | allow | using a unicode literal not in NFC normal form (see [unicode tr15](http://www.unicode.org/reports/tr15/) for further information)
-[unit_cmp](https://github.com/Manishearth/rust-clippy/wiki#unit_cmp) | warn | comparing unit values
-[unnecessary_mut_passed](https://github.com/Manishearth/rust-clippy/wiki#unnecessary_mut_passed) | warn | an argument passed as a mutable reference although the callee only demands an immutable reference
-[unnecessary_operation](https://github.com/Manishearth/rust-clippy/wiki#unnecessary_operation) | warn | outer expressions with no effect
-[unneeded_field_pattern](https://github.com/Manishearth/rust-clippy/wiki#unneeded_field_pattern) | warn | struct fields bound to a wildcard instead of using `..`
-[unsafe_removed_from_name](https://github.com/Manishearth/rust-clippy/wiki#unsafe_removed_from_name) | warn | `unsafe` removed from API names on import
-[unseparated_literal_suffix](https://github.com/Manishearth/rust-clippy/wiki#unseparated_literal_suffix) | allow | literals whose suffix is not separated by an underscore
-[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
-[unused_io_amount](https://github.com/Manishearth/rust-clippy/wiki#unused_io_amount) | deny | unused written/read amount
-[unused_label](https://github.com/Manishearth/rust-clippy/wiki#unused_label) | warn | unused labels
-[unused_lifetimes](https://github.com/Manishearth/rust-clippy/wiki#unused_lifetimes) | warn | unused lifetimes in function definitions
-[use_debug](https://github.com/Manishearth/rust-clippy/wiki#use_debug) | allow | use of `Debug`-based formatting
-[used_underscore_binding](https://github.com/Manishearth/rust-clippy/wiki#used_underscore_binding) | allow | using a binding which is prefixed with an underscore
-[useless_attribute](https://github.com/Manishearth/rust-clippy/wiki#useless_attribute) | warn | use of lint attributes on `extern crate` items
-[useless_format](https://github.com/Manishearth/rust-clippy/wiki#useless_format) | warn | useless use of `format!`
-[useless_let_if_seq](https://github.com/Manishearth/rust-clippy/wiki#useless_let_if_seq) | warn | unidiomatic `let mut` declaration followed by initialization in `if`
-[useless_transmute](https://github.com/Manishearth/rust-clippy/wiki#useless_transmute) | warn | transmutes that have the same to and from types or could be a cast/coercion
-[useless_vec](https://github.com/Manishearth/rust-clippy/wiki#useless_vec) | warn | useless `vec!`
-[while_let_loop](https://github.com/Manishearth/rust-clippy/wiki#while_let_loop) | warn | `loop { if let { ... } else break }`, which can be written as a `while let` loop
-[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
-[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
-[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
-[wrong_transmute](https://github.com/Manishearth/rust-clippy/wiki#wrong_transmute) | warn | transmutes that are confusing at best, undefined behaviour at worst and always useless
-[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
-[zero_prefixed_literal](https://github.com/Manishearth/rust-clippy/wiki#zero_prefixed_literal) | warn | integer literals starting with `0`
-[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
-
-More to come, please [file an issue](https://github.com/Manishearth/rust-clippy/issues) if you have ideas!
+There are 205 lints included in this crate:
+
+name | default | triggers on
+-----------------------------------------------------------------------------------------------------------------------------|---------|----------------------------------------------------------------------------------------------------------------------------------
+[absurd_extreme_comparisons](https://github.com/rust-lang-nursery/rust-clippy/wiki#absurd_extreme_comparisons) | warn | a comparison with a maximum or minimum value that is always true or false
+[almost_swapped](https://github.com/rust-lang-nursery/rust-clippy/wiki#almost_swapped) | warn | `foo = bar; bar = foo` sequence
+[approx_constant](https://github.com/rust-lang-nursery/rust-clippy/wiki#approx_constant) | warn | the approximate of a known float constant (in `std::fXX::consts`)
+[assign_op_pattern](https://github.com/rust-lang-nursery/rust-clippy/wiki#assign_op_pattern) | warn | assigning the result of an operation on a variable to that same variable
+[assign_ops](https://github.com/rust-lang-nursery/rust-clippy/wiki#assign_ops) | allow | any compound assignment operation
+[bad_bit_mask](https://github.com/rust-lang-nursery/rust-clippy/wiki#bad_bit_mask) | warn | expressions of the form `_ & mask == select` that will only ever return `true` or `false`
+[blacklisted_name](https://github.com/rust-lang-nursery/rust-clippy/wiki#blacklisted_name) | warn | usage of a blacklisted/placeholder name
+[block_in_if_condition_expr](https://github.com/rust-lang-nursery/rust-clippy/wiki#block_in_if_condition_expr) | warn | braces that can be eliminated in conditions, e.g. `if { true } ...`
+[block_in_if_condition_stmt](https://github.com/rust-lang-nursery/rust-clippy/wiki#block_in_if_condition_stmt) | warn | complex blocks in conditions, e.g. `if { let x = true; x } ...`
+[bool_comparison](https://github.com/rust-lang-nursery/rust-clippy/wiki#bool_comparison) | warn | comparing a variable to a boolean, e.g. `if x == true`
+[borrowed_box](https://github.com/rust-lang-nursery/rust-clippy/wiki#borrowed_box) | warn | a borrow of a boxed type
+[box_vec](https://github.com/rust-lang-nursery/rust-clippy/wiki#box_vec) | warn | usage of `Box<Vec<T>>`, vector elements are already on the heap
+[boxed_local](https://github.com/rust-lang-nursery/rust-clippy/wiki#boxed_local) | warn | using `Box<T>` where unnecessary
+[builtin_type_shadow](https://github.com/rust-lang-nursery/rust-clippy/wiki#builtin_type_shadow) | warn | shadowing a builtin type
+[cast_possible_truncation](https://github.com/rust-lang-nursery/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`
+[cast_possible_wrap](https://github.com/rust-lang-nursery/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`
+[cast_precision_loss](https://github.com/rust-lang-nursery/rust-clippy/wiki#cast_precision_loss) | allow | casts that cause loss of precision, e.g. `x as f32` where `x: u64`
+[cast_sign_loss](https://github.com/rust-lang-nursery/rust-clippy/wiki#cast_sign_loss) | allow | casts from signed types to unsigned types, e.g. `x as u32` where `x: i32`
+[char_lit_as_u8](https://github.com/rust-lang-nursery/rust-clippy/wiki#char_lit_as_u8) | warn | casting a character literal to u8
+[chars_next_cmp](https://github.com/rust-lang-nursery/rust-clippy/wiki#chars_next_cmp) | warn | using `.chars().next()` to check if a string starts with a char
+[clone_double_ref](https://github.com/rust-lang-nursery/rust-clippy/wiki#clone_double_ref) | warn | using `clone` on `&&T`
+[clone_on_copy](https://github.com/rust-lang-nursery/rust-clippy/wiki#clone_on_copy) | warn | using `clone` on a `Copy` type
+[cmp_nan](https://github.com/rust-lang-nursery/rust-clippy/wiki#cmp_nan) | deny | comparisons to NAN, which will always return false, probably not intended
+[cmp_null](https://github.com/rust-lang-nursery/rust-clippy/wiki#cmp_null) | warn | comparing a pointer to a null pointer, suggesting to use `.is_null()` instead.
+[cmp_owned](https://github.com/rust-lang-nursery/rust-clippy/wiki#cmp_owned) | warn | creating owned instances for comparing with others, e.g. `x == "foo".to_string()`
+[collapsible_if](https://github.com/rust-lang-nursery/rust-clippy/wiki#collapsible_if) | warn | `if`s that can be collapsed (e.g. `if x { if y { ... } }` and `else { if x { ... } }`)
+[crosspointer_transmute](https://github.com/rust-lang-nursery/rust-clippy/wiki#crosspointer_transmute) | warn | transmutes that have to or from types that are a pointer to the other
+[cyclomatic_complexity](https://github.com/rust-lang-nursery/rust-clippy/wiki#cyclomatic_complexity) | warn | functions that should be split up into multiple functions
+[deprecated_semver](https://github.com/rust-lang-nursery/rust-clippy/wiki#deprecated_semver) | warn | use of `#[deprecated(since = "x")]` where x is not semver
+[deref_addrof](https://github.com/rust-lang-nursery/rust-clippy/wiki#deref_addrof) | warn | use of `*&` or `*&mut` in an expression
+[derive_hash_xor_eq](https://github.com/rust-lang-nursery/rust-clippy/wiki#derive_hash_xor_eq) | warn | deriving `Hash` but implementing `PartialEq` explicitly
+[diverging_sub_expression](https://github.com/rust-lang-nursery/rust-clippy/wiki#diverging_sub_expression) | warn | whether an expression contains a diverging sub expression
+[doc_markdown](https://github.com/rust-lang-nursery/rust-clippy/wiki#doc_markdown) | warn | presence of `_`, `::` or camel-case outside backticks in documentation
+[double_neg](https://github.com/rust-lang-nursery/rust-clippy/wiki#double_neg) | warn | `--x`, which is a double negation of `x` and not a pre-decrement as in C/C++
+[double_parens](https://github.com/rust-lang-nursery/rust-clippy/wiki#double_parens) | warn | Warn on unnecessary double parentheses
+[drop_copy](https://github.com/rust-lang-nursery/rust-clippy/wiki#drop_copy) | warn | calls to `std::mem::drop` with a value that implements Copy
+[drop_ref](https://github.com/rust-lang-nursery/rust-clippy/wiki#drop_ref) | warn | calls to `std::mem::drop` with a reference instead of an owned value
+[duplicate_underscore_argument](https://github.com/rust-lang-nursery/rust-clippy/wiki#duplicate_underscore_argument) | warn | function arguments having names which only differ by an underscore
+[empty_enum](https://github.com/rust-lang-nursery/rust-clippy/wiki#empty_enum) | allow | enum with no variants
+[empty_loop](https://github.com/rust-lang-nursery/rust-clippy/wiki#empty_loop) | warn | empty `loop {}`, which should block or sleep
+[enum_clike_unportable_variant](https://github.com/rust-lang-nursery/rust-clippy/wiki#enum_clike_unportable_variant) | warn | C-like enums that are `repr(isize/usize)` and have values that don't fit into an `i32`
+[enum_glob_use](https://github.com/rust-lang-nursery/rust-clippy/wiki#enum_glob_use) | allow | use items that import all variants of an enum
+[enum_variant_names](https://github.com/rust-lang-nursery/rust-clippy/wiki#enum_variant_names) | warn | enums where all variants share a prefix/postfix
+[eq_op](https://github.com/rust-lang-nursery/rust-clippy/wiki#eq_op) | warn | equal operands on both sides of a comparison or bitwise combination (e.g. `x == x`)
+[eval_order_dependence](https://github.com/rust-lang-nursery/rust-clippy/wiki#eval_order_dependence) | warn | whether a variable read occurs before a write depends on sub-expression evaluation order
+[expl_impl_clone_on_copy](https://github.com/rust-lang-nursery/rust-clippy/wiki#expl_impl_clone_on_copy) | warn | implementing `Clone` explicitly on `Copy` types
+[explicit_counter_loop](https://github.com/rust-lang-nursery/rust-clippy/wiki#explicit_counter_loop) | warn | for-looping with an explicit counter when `_.enumerate()` would do
+[explicit_into_iter_loop](https://github.com/rust-lang-nursery/rust-clippy/wiki#explicit_into_iter_loop) | warn | for-looping over `_.into_iter()` when `_` would do
+[explicit_iter_loop](https://github.com/rust-lang-nursery/rust-clippy/wiki#explicit_iter_loop) | warn | for-looping over `_.iter()` or `_.iter_mut()` when `&_` or `&mut _` would do
+[filter_map](https://github.com/rust-lang-nursery/rust-clippy/wiki#filter_map) | allow | using combinations of `filter`, `map`, `filter_map` and `flat_map` which can usually be written as a single method call
+[filter_next](https://github.com/rust-lang-nursery/rust-clippy/wiki#filter_next) | warn | using `filter(p).next()`, which is more succinctly expressed as `.find(p)`
+[float_arithmetic](https://github.com/rust-lang-nursery/rust-clippy/wiki#float_arithmetic) | allow | any floating-point arithmetic statement
+[float_cmp](https://github.com/rust-lang-nursery/rust-clippy/wiki#float_cmp) | warn | using `==` or `!=` on float values instead of comparing difference with an epsilon
+[for_kv_map](https://github.com/rust-lang-nursery/rust-clippy/wiki#for_kv_map) | warn | looping on a map using `iter` when `keys` or `values` would do
+[for_loop_over_option](https://github.com/rust-lang-nursery/rust-clippy/wiki#for_loop_over_option) | warn | for-looping over an `Option`, which is more clearly expressed as an `if let`
+[for_loop_over_result](https://github.com/rust-lang-nursery/rust-clippy/wiki#for_loop_over_result) | warn | for-looping over a `Result`, which is more clearly expressed as an `if let`
+[forget_copy](https://github.com/rust-lang-nursery/rust-clippy/wiki#forget_copy) | warn | calls to `std::mem::forget` with a value that implements Copy
+[forget_ref](https://github.com/rust-lang-nursery/rust-clippy/wiki#forget_ref) | warn | calls to `std::mem::forget` with a reference instead of an owned value
+[get_unwrap](https://github.com/rust-lang-nursery/rust-clippy/wiki#get_unwrap) | warn | using `.get().unwrap()` or `.get_mut().unwrap()` when using `[]` would work instead
+[identity_op](https://github.com/rust-lang-nursery/rust-clippy/wiki#identity_op) | warn | using identity operations, e.g. `x + 0` or `y / 1`
+[if_let_redundant_pattern_matching](https://github.com/rust-lang-nursery/rust-clippy/wiki#if_let_redundant_pattern_matching) | warn | use the proper utility function avoiding an `if let`
+[if_let_some_result](https://github.com/rust-lang-nursery/rust-clippy/wiki#if_let_some_result) | warn | usage of `ok()` in `if let Some(pat)` statements is unnecessary, match on `Ok(pat)` instead
+[if_not_else](https://github.com/rust-lang-nursery/rust-clippy/wiki#if_not_else) | allow | `if` branches that could be swapped so no negation operation is necessary on the condition
+[if_same_then_else](https://github.com/rust-lang-nursery/rust-clippy/wiki#if_same_then_else) | warn | if with the same *then* and *else* blocks
+[ifs_same_cond](https://github.com/rust-lang-nursery/rust-clippy/wiki#ifs_same_cond) | warn | consecutive `ifs` with the same condition
+[inconsistent_digit_grouping](https://github.com/rust-lang-nursery/rust-clippy/wiki#inconsistent_digit_grouping) | warn | integer literals with digits grouped inconsistently
+[indexing_slicing](https://github.com/rust-lang-nursery/rust-clippy/wiki#indexing_slicing) | allow | indexing/slicing usage
+[ineffective_bit_mask](https://github.com/rust-lang-nursery/rust-clippy/wiki#ineffective_bit_mask) | warn | expressions where a bit mask will be rendered useless by a comparison, e.g. `(x | 1) > 2`
+[inline_always](https://github.com/rust-lang-nursery/rust-clippy/wiki#inline_always) | warn | use of `#[inline(always)]`
+[integer_arithmetic](https://github.com/rust-lang-nursery/rust-clippy/wiki#integer_arithmetic) | allow | any integer arithmetic statement
+[invalid_regex](https://github.com/rust-lang-nursery/rust-clippy/wiki#invalid_regex) | deny | invalid regular expressions
+[invalid_upcast_comparisons](https://github.com/rust-lang-nursery/rust-clippy/wiki#invalid_upcast_comparisons) | allow | a comparison involving an upcast which is always true or false
+[items_after_statements](https://github.com/rust-lang-nursery/rust-clippy/wiki#items_after_statements) | allow | blocks where an item comes after a statement
+[iter_cloned_collect](https://github.com/rust-lang-nursery/rust-clippy/wiki#iter_cloned_collect) | warn | using `.cloned().collect()` on slice to create a `Vec`
+[iter_next_loop](https://github.com/rust-lang-nursery/rust-clippy/wiki#iter_next_loop) | warn | for-looping over `_.next()` which is probably not intended
+[iter_nth](https://github.com/rust-lang-nursery/rust-clippy/wiki#iter_nth) | warn | using `.iter().nth()` on a standard library type with O(1) element access
+[iter_skip_next](https://github.com/rust-lang-nursery/rust-clippy/wiki#iter_skip_next) | warn | using `.skip(x).next()` on an iterator
+[iterator_step_by_zero](https://github.com/rust-lang-nursery/rust-clippy/wiki#iterator_step_by_zero) | warn | using `Iterator::step_by(0)`, which produces an infinite iterator
+[large_digit_groups](https://github.com/rust-lang-nursery/rust-clippy/wiki#large_digit_groups) | warn | grouping digits into groups that are too large
+[large_enum_variant](https://github.com/rust-lang-nursery/rust-clippy/wiki#large_enum_variant) | warn | large size difference between variants on an enum
+[len_without_is_empty](https://github.com/rust-lang-nursery/rust-clippy/wiki#len_without_is_empty) | warn | traits or impls with a public `len` method but no corresponding `is_empty` method
+[len_zero](https://github.com/rust-lang-nursery/rust-clippy/wiki#len_zero) | warn | checking `.len() == 0` or `.len() > 0` (or similar) when `.is_empty()` could be used instead
+[let_and_return](https://github.com/rust-lang-nursery/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
+[let_unit_value](https://github.com/rust-lang-nursery/rust-clippy/wiki#let_unit_value) | warn | creating a let binding to a value of unit type, which usually can't be used afterwards
+[linkedlist](https://github.com/rust-lang-nursery/rust-clippy/wiki#linkedlist) | warn | usage of LinkedList, usually a vector is faster, or a more specialized data structure like a VecDeque
+[logic_bug](https://github.com/rust-lang-nursery/rust-clippy/wiki#logic_bug) | warn | boolean expressions that contain terminals which can be eliminated
+[manual_swap](https://github.com/rust-lang-nursery/rust-clippy/wiki#manual_swap) | warn | manual swap of two variables
+[many_single_char_names](https://github.com/rust-lang-nursery/rust-clippy/wiki#many_single_char_names) | warn | too many single character bindings
+[map_clone](https://github.com/rust-lang-nursery/rust-clippy/wiki#map_clone) | warn | using `.map(|x| x.clone())` to clone an iterator or option's contents
+[map_entry](https://github.com/rust-lang-nursery/rust-clippy/wiki#map_entry) | warn | use of `contains_key` followed by `insert` on a `HashMap` or `BTreeMap`
+[match_bool](https://github.com/rust-lang-nursery/rust-clippy/wiki#match_bool) | warn | a match on a boolean expression instead of an `if..else` block
+[match_overlapping_arm](https://github.com/rust-lang-nursery/rust-clippy/wiki#match_overlapping_arm) | warn | a match with overlapping arms
+[match_ref_pats](https://github.com/rust-lang-nursery/rust-clippy/wiki#match_ref_pats) | warn | a match or `if let` with all arms prefixed with `&` instead of deref-ing the match expression
+[match_same_arms](https://github.com/rust-lang-nursery/rust-clippy/wiki#match_same_arms) | warn | `match` with identical arm bodies
+[match_wild_err_arm](https://github.com/rust-lang-nursery/rust-clippy/wiki#match_wild_err_arm) | warn | a match with `Err(_)` arm and take drastic actions
+[mem_forget](https://github.com/rust-lang-nursery/rust-clippy/wiki#mem_forget) | allow | `mem::forget` usage on `Drop` types, likely to cause memory leaks
+[min_max](https://github.com/rust-lang-nursery/rust-clippy/wiki#min_max) | warn | `min(_, max(_, _))` (or vice versa) with bounds clamping the result to a constant
+[misrefactored_assign_op](https://github.com/rust-lang-nursery/rust-clippy/wiki#misrefactored_assign_op) | warn | having a variable on both sides of an assign op
+[missing_docs_in_private_items](https://github.com/rust-lang-nursery/rust-clippy/wiki#missing_docs_in_private_items) | allow | detects missing documentation for public and private members
+[mixed_case_hex_literals](https://github.com/rust-lang-nursery/rust-clippy/wiki#mixed_case_hex_literals) | warn | hex literals whose letter digits are not consistently upper- or lowercased
+[module_inception](https://github.com/rust-lang-nursery/rust-clippy/wiki#module_inception) | warn | modules that have the same name as their parent module
+[modulo_one](https://github.com/rust-lang-nursery/rust-clippy/wiki#modulo_one) | warn | taking a number modulo 1, which always returns 0
+[mut_from_ref](https://github.com/rust-lang-nursery/rust-clippy/wiki#mut_from_ref) | warn | fns that create mutable refs from immutable ref args
+[mut_mut](https://github.com/rust-lang-nursery/rust-clippy/wiki#mut_mut) | allow | usage of double-mut refs, e.g. `&mut &mut ...`
+[mutex_atomic](https://github.com/rust-lang-nursery/rust-clippy/wiki#mutex_atomic) | warn | using a mutex where an atomic value could be used instead
+[mutex_integer](https://github.com/rust-lang-nursery/rust-clippy/wiki#mutex_integer) | allow | using a mutex for an integer type
+[needless_bool](https://github.com/rust-lang-nursery/rust-clippy/wiki#needless_bool) | warn | if-statements with plain booleans in the then- and else-clause, e.g. `if p { true } else { false }`
+[needless_borrow](https://github.com/rust-lang-nursery/rust-clippy/wiki#needless_borrow) | warn | taking a reference that is going to be automatically dereferenced
+[needless_borrowed_reference](https://github.com/rust-lang-nursery/rust-clippy/wiki#needless_borrowed_reference) | warn | taking a needless borrowed reference
+[needless_continue](https://github.com/rust-lang-nursery/rust-clippy/wiki#needless_continue) | warn | `continue` statements that can be replaced by a rearrangement of code
+[needless_lifetimes](https://github.com/rust-lang-nursery/rust-clippy/wiki#needless_lifetimes) | warn | using explicit lifetimes for references in function arguments when elision rules would allow omitting them
+[needless_pass_by_value](https://github.com/rust-lang-nursery/rust-clippy/wiki#needless_pass_by_value) | warn | functions taking arguments by value, but not consuming them in its body
+[needless_range_loop](https://github.com/rust-lang-nursery/rust-clippy/wiki#needless_range_loop) | warn | for-looping over a range of indices where an iterator over items would do
+[needless_return](https://github.com/rust-lang-nursery/rust-clippy/wiki#needless_return) | warn | using a return statement like `return expr;` where an expression would suffice
+[needless_update](https://github.com/rust-lang-nursery/rust-clippy/wiki#needless_update) | warn | using `Foo { ..base }` when there are no missing fields
+[neg_multiply](https://github.com/rust-lang-nursery/rust-clippy/wiki#neg_multiply) | warn | multiplying integers with -1
+[never_loop](https://github.com/rust-lang-nursery/rust-clippy/wiki#never_loop) | warn | any loop that will always `break` or `return`
+[new_ret_no_self](https://github.com/rust-lang-nursery/rust-clippy/wiki#new_ret_no_self) | warn | not returning `Self` in a `new` method
+[new_without_default](https://github.com/rust-lang-nursery/rust-clippy/wiki#new_without_default) | warn | `fn new() -> Self` method without `Default` implementation
+[new_without_default_derive](https://github.com/rust-lang-nursery/rust-clippy/wiki#new_without_default_derive) | warn | `fn new() -> Self` without `#[derive]`able `Default` implementation
+[no_effect](https://github.com/rust-lang-nursery/rust-clippy/wiki#no_effect) | warn | statements with no effect
+[non_ascii_literal](https://github.com/rust-lang-nursery/rust-clippy/wiki#non_ascii_literal) | allow | using any literal non-ASCII chars in a string literal instead of using the `\\u` escape
+[nonminimal_bool](https://github.com/rust-lang-nursery/rust-clippy/wiki#nonminimal_bool) | allow | boolean expressions that can be written more concisely
+[nonsensical_open_options](https://github.com/rust-lang-nursery/rust-clippy/wiki#nonsensical_open_options) | warn | nonsensical combination of options for opening a file
+[not_unsafe_ptr_arg_deref](https://github.com/rust-lang-nursery/rust-clippy/wiki#not_unsafe_ptr_arg_deref) | warn | public functions dereferencing raw pointer arguments but not marked `unsafe`
+[ok_expect](https://github.com/rust-lang-nursery/rust-clippy/wiki#ok_expect) | warn | using `ok().expect()`, which gives worse error messages than calling `expect` directly on the Result
+[op_ref](https://github.com/rust-lang-nursery/rust-clippy/wiki#op_ref) | warn | taking a reference to satisfy the type constraints on `==`
+[option_map_unwrap_or](https://github.com/rust-lang-nursery/rust-clippy/wiki#option_map_unwrap_or) | allow | using `Option.map(f).unwrap_or(a)`, which is more succinctly expressed as `map_or(a, f)`
+[option_map_unwrap_or_else](https://github.com/rust-lang-nursery/rust-clippy/wiki#option_map_unwrap_or_else) | allow | using `Option.map(f).unwrap_or_else(g)`, which is more succinctly expressed as `map_or_else(g, f)`
+[option_unwrap_used](https://github.com/rust-lang-nursery/rust-clippy/wiki#option_unwrap_used) | allow | using `Option.unwrap()`, which should at least get a better message using `expect()`
+[or_fun_call](https://github.com/rust-lang-nursery/rust-clippy/wiki#or_fun_call) | warn | using any `*or` method with a function call, which suggests `*or_else`
+[out_of_bounds_indexing](https://github.com/rust-lang-nursery/rust-clippy/wiki#out_of_bounds_indexing) | deny | out of bounds constant indexing
+[overflow_check_conditional](https://github.com/rust-lang-nursery/rust-clippy/wiki#overflow_check_conditional) | warn | overflow checks inspired by C which are likely to panic
+[panic_params](https://github.com/rust-lang-nursery/rust-clippy/wiki#panic_params) | warn | missing parameters in `panic!` calls
+[partialeq_ne_impl](https://github.com/rust-lang-nursery/rust-clippy/wiki#partialeq_ne_impl) | warn | re-implementing `PartialEq::ne`
+[possible_missing_comma](https://github.com/rust-lang-nursery/rust-clippy/wiki#possible_missing_comma) | warn | possible missing comma in array
+[precedence](https://github.com/rust-lang-nursery/rust-clippy/wiki#precedence) | warn | operations where precedence may be unclear
+[print_stdout](https://github.com/rust-lang-nursery/rust-clippy/wiki#print_stdout) | allow | printing on stdout
+[print_with_newline](https://github.com/rust-lang-nursery/rust-clippy/wiki#print_with_newline) | warn | using `print!()` with a format string that ends in a newline
+[ptr_arg](https://github.com/rust-lang-nursery/rust-clippy/wiki#ptr_arg) | warn | fn arguments of the type `&Vec<...>` or `&String`, suggesting to use `&[...]` or `&str` instead, respectively
+[pub_enum_variant_names](https://github.com/rust-lang-nursery/rust-clippy/wiki#pub_enum_variant_names) | allow | enums where all variants share a prefix/postfix
+[range_zip_with_len](https://github.com/rust-lang-nursery/rust-clippy/wiki#range_zip_with_len) | warn | zipping iterator with a range when `enumerate()` would do
+[redundant_closure](https://github.com/rust-lang-nursery/rust-clippy/wiki#redundant_closure) | warn | redundant closures, i.e. `|a| foo(a)` (which can be written as just `foo`)
+[redundant_closure_call](https://github.com/rust-lang-nursery/rust-clippy/wiki#redundant_closure_call) | warn | throwaway closures called in the expression they are defined
+[redundant_pattern](https://github.com/rust-lang-nursery/rust-clippy/wiki#redundant_pattern) | warn | using `name @ _` in a pattern
+[regex_macro](https://github.com/rust-lang-nursery/rust-clippy/wiki#regex_macro) | warn | use of `regex!(_)` instead of `Regex::new(_)`
+[result_unwrap_used](https://github.com/rust-lang-nursery/rust-clippy/wiki#result_unwrap_used) | allow | using `Result.unwrap()`, which might be better handled
+[reverse_range_loop](https://github.com/rust-lang-nursery/rust-clippy/wiki#reverse_range_loop) | warn | iteration over an empty range, such as `10..0` or `5..5`
+[search_is_some](https://github.com/rust-lang-nursery/rust-clippy/wiki#search_is_some) | warn | using an iterator search followed by `is_some()`, which is more succinctly expressed as a call to `any()`
+[serde_api_misuse](https://github.com/rust-lang-nursery/rust-clippy/wiki#serde_api_misuse) | warn | various things that will negatively affect your serde experience
+[shadow_reuse](https://github.com/rust-lang-nursery/rust-clippy/wiki#shadow_reuse) | allow | rebinding a name to an expression that re-uses the original value, e.g. `let x = x + 1`
+[shadow_same](https://github.com/rust-lang-nursery/rust-clippy/wiki#shadow_same) | allow | rebinding a name to itself, e.g. `let mut x = &mut x`
+[shadow_unrelated](https://github.com/rust-lang-nursery/rust-clippy/wiki#shadow_unrelated) | allow | rebinding a name without even using the original value
+[short_circuit_statement](https://github.com/rust-lang-nursery/rust-clippy/wiki#short_circuit_statement) | warn | using a short circuit boolean condition as a statement
+[should_assert_eq](https://github.com/rust-lang-nursery/rust-clippy/wiki#should_assert_eq) | warn | using `assert` macro for asserting equality
+[should_implement_trait](https://github.com/rust-lang-nursery/rust-clippy/wiki#should_implement_trait) | warn | defining a method that should be implementing a std trait
+[similar_names](https://github.com/rust-lang-nursery/rust-clippy/wiki#similar_names) | allow | similarly named items and bindings
+[single_char_pattern](https://github.com/rust-lang-nursery/rust-clippy/wiki#single_char_pattern) | warn | using a single-character str where a char could be used, e.g. `_.split("x")`
+[single_match](https://github.com/rust-lang-nursery/rust-clippy/wiki#single_match) | warn | a match statement with a single nontrivial arm (i.e. where the other arm is `_ => {}`) instead of `if let`
+[single_match_else](https://github.com/rust-lang-nursery/rust-clippy/wiki#single_match_else) | allow | a match statement with a two arms where the second arm's pattern is a wildcard instead of `if let`
+[string_add](https://github.com/rust-lang-nursery/rust-clippy/wiki#string_add) | allow | using `x + ..` where x is a `String` instead of `push_str()`
+[string_add_assign](https://github.com/rust-lang-nursery/rust-clippy/wiki#string_add_assign) | allow | using `x = x + ..` where x is a `String` instead of `push_str()`
+[string_extend_chars](https://github.com/rust-lang-nursery/rust-clippy/wiki#string_extend_chars) | warn | using `x.extend(s.chars())` where s is a `&str` or `String`
+[string_lit_as_bytes](https://github.com/rust-lang-nursery/rust-clippy/wiki#string_lit_as_bytes) | warn | calling `as_bytes` on a string literal instead of using a byte string literal
+[stutter](https://github.com/rust-lang-nursery/rust-clippy/wiki#stutter) | allow | type names prefixed/postfixed with their containing module's name
+[suspicious_assignment_formatting](https://github.com/rust-lang-nursery/rust-clippy/wiki#suspicious_assignment_formatting) | warn | suspicious formatting of `*=`, `-=` or `!=`
+[suspicious_else_formatting](https://github.com/rust-lang-nursery/rust-clippy/wiki#suspicious_else_formatting) | warn | suspicious formatting of `else if`
+[temporary_assignment](https://github.com/rust-lang-nursery/rust-clippy/wiki#temporary_assignment) | warn | assignments to temporaries
+[temporary_cstring_as_ptr](https://github.com/rust-lang-nursery/rust-clippy/wiki#temporary_cstring_as_ptr) | warn | getting the inner pointer of a temporary `CString`
+[too_many_arguments](https://github.com/rust-lang-nursery/rust-clippy/wiki#too_many_arguments) | warn | functions with too many arguments
+[toplevel_ref_arg](https://github.com/rust-lang-nursery/rust-clippy/wiki#toplevel_ref_arg) | warn | an entire binding declared as `ref`, in a function argument or a `let` statement
+[transmute_ptr_to_ref](https://github.com/rust-lang-nursery/rust-clippy/wiki#transmute_ptr_to_ref) | warn | transmutes from a pointer to a reference type
+[trivial_regex](https://github.com/rust-lang-nursery/rust-clippy/wiki#trivial_regex) | warn | trivial regular expressions
+[type_complexity](https://github.com/rust-lang-nursery/rust-clippy/wiki#type_complexity) | warn | usage of very complex types that might be better factored into `type` definitions
+[unicode_not_nfc](https://github.com/rust-lang-nursery/rust-clippy/wiki#unicode_not_nfc) | allow | using a unicode literal not in NFC normal form (see [unicode tr15](http://www.unicode.org/reports/tr15/) for further information)
+[unit_cmp](https://github.com/rust-lang-nursery/rust-clippy/wiki#unit_cmp) | warn | comparing unit values
+[unnecessary_cast](https://github.com/rust-lang-nursery/rust-clippy/wiki#unnecessary_cast) | warn | cast to the same type, e.g. `x as i32` where `x: i32`
+[unnecessary_mut_passed](https://github.com/rust-lang-nursery/rust-clippy/wiki#unnecessary_mut_passed) | warn | an argument passed as a mutable reference although the callee only demands an immutable reference
+[unnecessary_operation](https://github.com/rust-lang-nursery/rust-clippy/wiki#unnecessary_operation) | warn | outer expressions with no effect
+[unneeded_field_pattern](https://github.com/rust-lang-nursery/rust-clippy/wiki#unneeded_field_pattern) | warn | struct fields bound to a wildcard instead of using `..`
+[unreadable_literal](https://github.com/rust-lang-nursery/rust-clippy/wiki#unreadable_literal) | warn | long integer literal without underscores
+[unsafe_removed_from_name](https://github.com/rust-lang-nursery/rust-clippy/wiki#unsafe_removed_from_name) | warn | `unsafe` removed from API names on import
+[unseparated_literal_suffix](https://github.com/rust-lang-nursery/rust-clippy/wiki#unseparated_literal_suffix) | allow | literals whose suffix is not separated by an underscore
+[unused_collect](https://github.com/rust-lang-nursery/rust-clippy/wiki#unused_collect) | warn | `collect()`ing an iterator without using the result; this is usually better written as a for loop
+[unused_io_amount](https://github.com/rust-lang-nursery/rust-clippy/wiki#unused_io_amount) | deny | unused written/read amount
+[unused_label](https://github.com/rust-lang-nursery/rust-clippy/wiki#unused_label) | warn | unused labels
+[unused_lifetimes](https://github.com/rust-lang-nursery/rust-clippy/wiki#unused_lifetimes) | warn | unused lifetimes in function definitions
+[use_debug](https://github.com/rust-lang-nursery/rust-clippy/wiki#use_debug) | allow | use of `Debug`-based formatting
+[use_self](https://github.com/rust-lang-nursery/rust-clippy/wiki#use_self) | allow | Unnecessary structure name repetition whereas `Self` is applicable
+[used_underscore_binding](https://github.com/rust-lang-nursery/rust-clippy/wiki#used_underscore_binding) | allow | using a binding which is prefixed with an underscore
+[useless_attribute](https://github.com/rust-lang-nursery/rust-clippy/wiki#useless_attribute) | warn | use of lint attributes on `extern crate` items
+[useless_format](https://github.com/rust-lang-nursery/rust-clippy/wiki#useless_format) | warn | useless use of `format!`
+[useless_let_if_seq](https://github.com/rust-lang-nursery/rust-clippy/wiki#useless_let_if_seq) | warn | unidiomatic `let mut` declaration followed by initialization in `if`
+[useless_transmute](https://github.com/rust-lang-nursery/rust-clippy/wiki#useless_transmute) | warn | transmutes that have the same to and from types or could be a cast/coercion
+[useless_vec](https://github.com/rust-lang-nursery/rust-clippy/wiki#useless_vec) | warn | useless `vec!`
+[verbose_bit_mask](https://github.com/rust-lang-nursery/rust-clippy/wiki#verbose_bit_mask) | warn | expressions where a bit mask is less readable than the corresponding method call
+[while_let_loop](https://github.com/rust-lang-nursery/rust-clippy/wiki#while_let_loop) | warn | `loop { if let { ... } else break }`, which can be written as a `while let` loop
+[while_let_on_iterator](https://github.com/rust-lang-nursery/rust-clippy/wiki#while_let_on_iterator) | warn | using a while-let loop instead of a for loop on an iterator
+[wrong_pub_self_convention](https://github.com/rust-lang-nursery/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
+[wrong_self_convention](https://github.com/rust-lang-nursery/rust-clippy/wiki#wrong_self_convention) | warn | defining a method named with an established prefix (like "into_") that takes `self` with the wrong convention
+[wrong_transmute](https://github.com/rust-lang-nursery/rust-clippy/wiki#wrong_transmute) | warn | transmutes that are confusing at best, undefined behaviour at worst and always useless
+[zero_divided_by_zero](https://github.com/rust-lang-nursery/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
+[zero_prefixed_literal](https://github.com/rust-lang-nursery/rust-clippy/wiki#zero_prefixed_literal) | warn | integer literals starting with `0`
+[zero_ptr](https://github.com/rust-lang-nursery/rust-clippy/wiki#zero_ptr) | warn | using 0 as *{const, mut} T
+[zero_width_space](https://github.com/rust-lang-nursery/rust-clippy/wiki#zero_width_space) | deny | using a zero-width space in a string literal, which is confusing
+
+More to come, please [file an issue](https://github.com/rust-lang-nursery/rust-clippy/issues) if you have ideas!
## License
projects / rust.git / blobdiff