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-
-Available lint options:
- -W <foo> Warn about <foo>
- -A <foo> Allow <foo>
- -D <foo> Deny <foo>
- -F <foo> Forbid <foo> (deny <foo> and all attempts to override)
-
-
-Lint checks provided by rustc:
-
- name default meaning
- ---- ------- -------
- 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
- anonymous-parameters allow detects anonymous parameters
- 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
- invalid-html-tags allow detects invalid HTML tags in doc comments
- 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-copy-implementations allow detects potentially-forgotten implementations of `Copy`
- missing-crate-level-docs allow detects crates with no crate-level documentation
- missing-debug-implementations allow detects missing implementations of Debug
- missing-docs allow detects missing documentation for public members
- missing-doc-code-examples allow detects publicly-exported items without code samples in their documentation
- non-ascii-idents allow detects non-ASCII identifiers
- pointer-structural-match allow pointers are not structural-match
- private-doc-tests allow detects code samples in docs of private items not documented by rustdoc
- 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
- unaligned-references allow detects unaligned references to fields of packed structs
- 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
- array-into-iter warn detects calling `into_iter` on arrays
- asm-sub-register warn using only a subset of a register for inline asm inputs
- 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
- broken-intra-doc-links warn failures in resolving intra-doc link targets
- 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
- drop-bounds warn bounds of the form `T: Drop` are useless
- ellipsis-inclusive-range-patterns warn `...` range patterns are deprecated
- exported-private-dependencies warn public interface leaks type from a private dependency
- 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-codeblock-attributes warn codeblock attribute looks a lot like a known one
- 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
- late-bound-lifetime-arguments warn detects generic lifetime arguments in path segments with late bound lifetime parameters
- 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-autolinks warn detects URLs that could be written using only angle brackets
- non-camel-case-types warn types, variants, traits and type parameters should have camel case names
- 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
- panic-fmt warn detect braces in single-argument panic!() invocations
- path-statements warn path statements with no effect
- private-intra-doc-links warn linking from a public item to a private one
- private-in-public warn detect private items in public interfaces not caught by the old implementation
- proc-macro-derive-resolution-fallback warn detects proc macro derives using inaccessible names from parent modules
- redundant-semicolons warn detects unnecessary trailing semicolons
- renamed-and-removed-lints warn lints that have been renamed or removed
- safe-packed-borrows warn safe borrows of fields of packed structs were erroneously allowed
- stable-features warn stable features found in `#[feature]` directive
- 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
- uncommon-codepoints warn detects uncommon Unicode codepoints in identifiers
- unconditional-recursion warn functions that cannot return without calling themselves
- 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-naked-functions warn unsupported naked function definitions
- 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 detected erroneous expression
- 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
- 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 mutating transmuted &mut T from &T may cause undefined behavior
- 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
- 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
- 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 keyword-idents, anonymous-parameters, illegal-floating-point-literal-pattern, private-in-public, pub-use-of-private-extern-crate, invalid-type-param-default, safe-packed-borrows, patterns-in-fns-without-body, missing-fragment-specifier, late-bound-lifetime-arguments, order-dependent-trait-objects, coherence-leak-check, tyvar-behind-raw-pointer, absolute-paths-not-starting-with-crate, 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-conflict, indirect-structural-match, pointer-structural-match, nontrivial-structural-match, soft-unstable, cenum-impl-drop-cast, const-evaluatable-unchecked, uninhabited-static, unsupported-naked-functions, array-into-iter
- 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
- rustdoc non-autolinks, broken-intra-doc-links, private-intra-doc-links, invalid-codeblock-attributes, missing-doc-code-examples, private-doc-tests, invalid-html-tags
- unused unused-imports, unused-variables, unused-assignments, dead-code, unused-mut, unreachable-code, unreachable-patterns, unused-must-use, unused-unsafe, path-statements, unused-attributes, unused-macros, unused-allocation, unused-doc-comments, unused-extern-crates, unused-features, unused-labels, unused-parens, unused-braces, redundant-semicolons
-
-
-Lint tools like Clippy can provide additional lints and lint groups.