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# Current lints and the above categories

1. [future-proofing][]: flagging code that a future release of Rust will reject (potentially edition-tied),
2. [error-heuristic][]: flagging sound code correlated with programmer error,
3. [uniformly-clean][]: enforcement of uniform coding style, and
4. [expressly-clean][]: educating the user about Rust features

Lint | [future-proofing] | [error-heuristic] | [uniformly-clean] | [expressly-clean]
------|--------|--------|------|------

absolute-paths-not-starting-with-crate allow fully qualified paths that start with a module name instead of `crate`, `self`, or an extern crate name
box-pointers allow use of owned (Box type) heap memory
deprecated-in-future allow detects use of items that will be deprecated in a future version
elided-lifetimes-in-paths allow hidden lifetime parameters in types are deprecated
explicit-outlives-requirements allow outlives requirements can be inferred
keyword-idents allow detects edition keywords being used as an identifier
macro-use-extern-crate allow the `#[macro_use]` attribute is now deprecated in favor of using macros via the module system
meta-variable-misuse allow possible meta-variable misuse at macro definition
missing-abi allow No declared ABI for extern declaration
missing-copy-implementations allow detects potentially-forgotten implementations of `Copy`
missing-debug-implementations allow detects missing implementations of Debug
missing-docs allow detects missing documentation for public members
must-not-suspend allow use of a `#[must_not_suspend]` value across a yield point
non-ascii-idents allow detects non-ASCII identifiers
non-exhaustive-omitted-patterns allow detect when patterns of types marked `non_exhaustive` are missed
noop-method-call allow detects the use of well-known noop methods
pointer-structural-match allow pointers are not structural-match
rust-2021-incompatible-closure-captures allow detects closures affected by Rust 2021 changes
rust-2021-incompatible-or-patterns allow detects usage of old versions of or-patterns
rust-2021-prefixes-incompatible-syntax allow identifiers that will be parsed as a prefix in Rust 2021
rust-2021-prelude-collisions allow detects the usage of trait methods which are ambiguous with traits added to the prelude in future editions
single-use-lifetimes allow detects lifetime parameters that are only used once
trivial-casts allow detects trivial casts which could be removed
trivial-numeric-casts allow detects trivial casts of numeric types which could be removed
unreachable-pub allow `pub` items not reachable from crate root
unsafe-code allow usage of `unsafe` code
unsafe-op-in-unsafe-fn allow unsafe operations in unsafe functions without an explicit unsafe block are deprecated
unstable-features allow enabling unstable features (deprecated. do not use)
unused-crate-dependencies allow crate dependencies that are never used
unused-extern-crates allow extern crates that are never used
unused-import-braces allow unnecessary braces around an imported item
unused-lifetimes allow detects lifetime parameters that are never used
unused-qualifications allow detects unnecessarily qualified names
unused-results allow unused result of an expression in a statement
variant-size-differences allow detects enums with widely varying variant sizes
anonymous-parameters warn detects anonymous parameters
array-into-iter warn detects calling `into_iter` on arrays in Rust 2015 and 2018
asm-sub-register warn using only a subset of a register for inline asm inputs
bad-asm-style warn incorrect use of inline assembly
bare-trait-objects warn suggest using `dyn Trait` for trait objects
bindings-with-variant-name warn detects pattern bindings with the same name as one of the matched variants
break-with-label-and-loop warn `break` expression with label and unlabeled loop as value expression
cenum-impl-drop-cast warn a C-like enum implementing Drop is cast
clashing-extern-declarations warn detects when an extern fn has been declared with the same name but different types
coherence-leak-check warn distinct impls distinguished only by the leak-check code
confusable-idents warn detects visually confusable pairs between identifiers
const-evaluatable-unchecked warn detects a generic constant is used in a type without a emitting a warning
const-item-mutation warn detects attempts to mutate a `const` item
dead-code warn detect unused, unexported items
deprecated warn detects use of deprecated items
deprecated-cfg-attr-crate-type-name warn detects usage of `#![cfg_attr(..., crate_type/crate_name = "...")]`
deprecated-where-clause-location warn deprecated where clause location
deref-into-dyn-supertrait warn `Deref` implementation usage with a supertrait trait object for output might be shadowed in the future
deref-nullptr warn detects when an null pointer is dereferenced
drop-bounds warn bounds of the form `T: Drop` are most likely incorrect
duplicate-macro-attributes warn duplicated attribute
dyn-drop warn trait objects of the form `dyn Drop` are useless
ellipsis-inclusive-range-patterns warn `...` range patterns are deprecated
exported-private-dependencies warn public interface leaks type from a private dependency
forbidden-lint-groups warn applying forbid to lint-groups
function-item-references warn suggest casting to a function pointer when attempting to take references to function items
illegal-floating-point-literal-pattern warn floating-point literals cannot be used in patterns
improper-ctypes warn proper use of libc types in foreign modules
improper-ctypes-definitions warn proper use of libc types in foreign item definitions
incomplete-features warn incomplete features that may function improperly in some or all cases
indirect-structural-match warn constant used in pattern contains value of non-structural-match type in a field or a variant
inline-no-sanitize warn detects incompatible use of `#[inline(always)]` and `#[no_sanitize(...)]`
invalid-doc-attributes warn detects invalid `#[doc(...)]` attributes
invalid-value warn an invalid value is being created (such as a null reference)
irrefutable-let-patterns warn detects irrefutable patterns in `if let` and `while let` statements
large-assignments warn detects large moves or copies
late-bound-lifetime-arguments warn detects generic lifetime arguments in path segments with late bound lifetime parameters
legacy-derive-helpers warn detects derive helper attributes that are used before they are introduced
mixed-script-confusables warn detects Unicode scripts whose mixed script confusables codepoints are solely used
mutable-borrow-reservation-conflict warn reservation of a two-phased borrow conflicts with other shared borrows
nontrivial-structural-match warn constant used in pattern of non-structural-match type and the constant's initializer expression contains values of non-structural-match types
non-camel-case-types warn types, variants, traits and type parameters should have camel case names
non-fmt-panics warn detect single-argument panic!() invocations in which the argument is not a format string
non-shorthand-field-patterns warn using `Struct { x: x }` instead of `Struct { x }` in a pattern
non-snake-case warn variables, methods, functions, lifetime parameters and modules should have snake case names
non-upper-case-globals warn static constants should have uppercase identifiers
no-mangle-generic-items warn generic items must be mangled
overlapping-range-endpoints warn detects range patterns with overlapping endpoints
path-statements warn path statements with no effect
private-in-public warn detect private items in public interfaces not caught by the old implementation
redundant-semicolons warn detects unnecessary trailing semicolons
renamed-and-removed-lints warn lints that have been renamed or removed
semicolon-in-expressions-from-macros warn trailing semicolon in macro body used as expression
stable-features warn stable features found in `#[feature]` directive
suspicious-auto-trait-impls warn the rules governing auto traits will change in the future
temporary-cstring-as-ptr warn detects getting the inner pointer of a temporary `CString`
trivial-bounds warn these bounds don't depend on an type parameters
type-alias-bounds warn bounds in type aliases are not enforced
tyvar-behind-raw-pointer warn raw pointer to an inference variable
unaligned-references warn detects unaligned references to fields of packed structs
uncommon-codepoints warn detects uncommon Unicode codepoints in identifiers
unconditional-recursion warn functions that cannot return without calling themselves
unexpected-cfgs warn detects unexpected names and values in `#[cfg]` conditions
unfulfilled-lint-expectations warn unfulfilled lint expectation
uninhabited-static warn uninhabited static
unknown-lints warn unrecognized lint attribute
unnameable-test-items warn detects an item that cannot be named being marked as `#[test_case]`
unreachable-code warn detects unreachable code paths
unreachable-patterns warn detects unreachable patterns
unstable-name-collisions warn detects name collision with an existing but unstable method
unsupported-calling-conventions warn use of unsupported calling convention
unused-allocation warn detects unnecessary allocations that can be eliminated
unused-assignments warn detect assignments that will never be read
unused-attributes warn detects attributes that were not used by the compiler
unused-braces warn unnecessary braces around an expression
unused-comparisons warn comparisons made useless by limits of the types involved
unused-doc-comments warn detects doc comments that aren't used by rustdoc
unused-features warn unused features found in crate-level `#[feature]` directives
unused-imports warn imports that are never used
unused-labels warn detects labels that are never used
unused-macros warn detects macros that were not used
unused-must-use warn unused result of a type flagged as `#[must_use]`
unused-mut warn detect mut variables which don't need to be mutable
unused-parens warn `if`, `match`, `while` and `return` do not need parentheses
unused-unsafe warn unnecessary use of an `unsafe` block
unused-variables warn detect variables which are not used in any way
warnings warn mass-change the level for lints which produce warnings
where-clauses-object-safety warn checks the object safety of where clauses
while-true warn suggest using `loop { }` instead of `while true { }`
ambiguous-associated-items deny ambiguous associated items
arithmetic-overflow deny arithmetic operation overflows
conflicting-repr-hints deny conflicts between `#[repr(..)]` hints that were previously accepted and used in practice
const-err deny constant evaluation encountered erroneous expression
enum-intrinsics-non-enums deny detects calls to `core::mem::discriminant` and `core::mem::variant_count` with non-enum types
ill-formed-attribute-input deny ill-formed attribute inputs that were previously accepted and used in practice
incomplete-include deny trailing content in included file
ineffective-unstable-trait-impl deny detects `#[unstable]` on stable trait implementations for stable types
invalid-atomic-ordering deny usage of invalid atomic ordering in atomic operations and memory fences
invalid-type-param-default deny type parameter default erroneously allowed in invalid location
macro-expanded-macro-exports-accessed-by-absolute-paths deny macro-expanded `macro_export` macros from the current crate cannot be referred to by absolute paths
missing-fragment-specifier deny detects missing fragment specifiers in unused `macro_rules!` patterns
mutable-transmutes deny transmuting &T to &mut T is undefined behavior, even if the reference is unused
named-asm-labels deny named labels in inline assembly
no-mangle-const-items deny const items will not have their symbols exported
order-dependent-trait-objects deny trait-object types were treated as different depending on marker-trait order
overflowing-literals deny literal out of range for its type
patterns-in-fns-without-body deny patterns in functions without body were erroneously allowed
proc-macro-back-compat deny detects usage of old versions of certain proc-macro crates
proc-macro-derive-resolution-fallback deny detects proc macro derives using inaccessible names from parent modules
pub-use-of-private-extern-crate deny detect public re-exports of private extern crates
soft-unstable deny a feature gate that doesn't break dependent crates
test-unstable-lint deny this unstable lint is only for testing
text-direction-codepoint-in-comment deny invisible directionality-changing codepoints in comment
text-direction-codepoint-in-literal deny detect special Unicode codepoints that affect the visual representation of text on screen, changing the direction in which text flows
unconditional-panic deny operation will cause a panic at runtime
unknown-crate-types deny unknown crate type found in `#[crate_type]` directive
useless-deprecated deny detects deprecation attributes with no effect

Lint groups provided by rustc:

name sub-lints
---- ---------
warnings all lints that are set to issue warnings
future-incompatible forbidden-lint-groups, illegal-floating-point-literal-pattern, private-in-public, pub-use-of-private-extern-crate, invalid-type-param-default, const-err, unaligned-references\
, patterns-in-fns-without-body, missing-fragment-specifier, late-bound-lifetime-arguments, order-dependent-trait-objects, coherence-leak-check, unstable-name-collisions, where-clauses-object-safety, proc\
-macro-derive-resolution-fallback, macro-expanded-macro-exports-accessed-by-absolute-paths, ill-formed-attribute-input, conflicting-repr-hints, ambiguous-associated-items, mutable-borrow-reservation-conf\
lict, indirect-structural-match, pointer-structural-match, nontrivial-structural-match, soft-unstable, cenum-impl-drop-cast, const-evaluatable-unchecked, uninhabited-static, invalid-doc-attributes, semic\
olon-in-expressions-from-macros, legacy-derive-helpers, proc-macro-back-compat, unsupported-calling-conventions, deref-into-dyn-supertrait, deprecated-cfg-attr-crate-type-name, suspicious-auto-trait-impl\
s
nonstandard-style non-camel-case-types, non-snake-case, non-upper-case-globals
rust-2018-compatibility keyword-idents, anonymous-parameters, tyvar-behind-raw-pointer, absolute-paths-not-starting-with-crate
rust-2018-idioms bare-trait-objects, unused-extern-crates, ellipsis-inclusive-range-patterns, elided-lifetimes-in-paths, explicit-outlives-requirements
rust-2021-compatibility ellipsis-inclusive-range-patterns, bare-trait-objects, rust-2021-incompatible-closure-captures, rust-2021-incompatible-or-patterns, rust-2021-prelude-collisions, rust-2021-pr\
efixes-incompatible-syntax, array-into-iter, non-fmt-panics
unused unused-imports, unused-variables, unused-assignments, dead-code, unused-mut, unreachable-code, unreachable-patterns, unused-must-use, unused-unsafe, path-statements, unused-a\
ttributes, unused-macros, unused-allocation, unused-doc-comments, unused-extern-crates, unused-features, unused-labels, unused-parens, unused-braces, redundant-semicolons

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