Lint Configuration Options
The following list shows each configuration option, along with a description, its default value, an example and lints affected.
arithmetic-side-effects-allowed
Suppress checking of the passed type names in all types of operations.
If a specific operation is desired, consider using arithmetic_side_effects_allowed_binary
or arithmetic_side_effects_allowed_unary
instead.
Example
arithmetic-side-effects-allowed = ["SomeType", "AnotherType"]
Noteworthy
A type, say SomeType
, listed in this configuration has the same behavior of
["SomeType" , "*"], ["*", "SomeType"]
in arithmetic_side_effects_allowed_binary
.
Default Value: {}
(rustc_data_structures::fx::FxHashSet<String>
)
Affected lints:
arithmetic-side-effects-allowed-binary
Suppress checking of the passed type pair names in binary operations like addition or multiplication.
Supports the "*" wildcard to indicate that a certain type won't trigger the lint regardless
of the involved counterpart. For example, ["SomeType", "*"]
or ["*", "AnotherType"]
.
Pairs are asymmetric, which means that ["SomeType", "AnotherType"]
is not the same as
["AnotherType", "SomeType"]
.
Example
arithmetic-side-effects-allowed-binary = [["SomeType" , "f32"], ["AnotherType", "*"]]
Default Value: []
(Vec<[String; 2]>
)
Affected lints:
arithmetic-side-effects-allowed-unary
Suppress checking of the passed type names in unary operations like "negation" (-
).
Example
arithmetic-side-effects-allowed-unary = ["SomeType", "AnotherType"]
Default Value: {}
(rustc_data_structures::fx::FxHashSet<String>
)
Affected lints:
avoid-breaking-exported-api
Suppress lints whenever the suggested change would cause breakage for other crates.
Default Value: true
(bool
)
Affected lints:
enum_variant_names
large_types_passed_by_value
trivially_copy_pass_by_ref
unnecessary_wraps
unused_self
upper_case_acronyms
wrong_self_convention
box_collection
redundant_allocation
rc_buffer
vec_box
option_option
linkedlist
rc_mutex
unnecessary_box_returns
single_call_fn
msrv
The minimum rust version that the project supports
Default Value: None
(Option<String>
)
Affected lints:
manual_split_once
manual_str_repeat
cloned_instead_of_copied
redundant_field_names
option_map_unwrap_or
redundant_static_lifetimes
filter_map_next
checked_conversions
manual_range_contains
use_self
mem_replace_with_default
manual_non_exhaustive
option_as_ref_deref
map_unwrap_or
match_like_matches_macro
manual_strip
missing_const_for_fn
unnested_or_patterns
from_over_into
ptr_as_ptr
if_then_some_else_none
approx_constant
deprecated_cfg_attr
index_refutable_slice
map_clone
borrow_as_ptr
manual_bits
err_expect
cast_abs_to_unsigned
uninlined_format_args
manual_clamp
manual_let_else
unchecked_duration_subtraction
collapsible_str_replace
seek_from_current
seek_rewind
unnecessary_lazy_evaluations
transmute_ptr_to_ref
almost_complete_range
needless_borrow
derivable_impls
manual_is_ascii_check
manual_rem_euclid
manual_retain
type_repetition_in_bounds
tuple_array_conversions
manual_try_fold
manual_hash_one
cognitive-complexity-threshold
The maximum cognitive complexity a function can have
Default Value: 25
(u64
)
Affected lints:
excessive-nesting-threshold
The maximum amount of nesting a block can reside in
Default Value: 0
(u64
)
Affected lints:
disallowed-names
The list of disallowed names to lint about. NB: bar
is not here since it has legitimate uses. The value
".."
can be used as part of the list to indicate that the configured values should be appended to the
default configuration of Clippy. By default, any configuration will replace the default value.
Default Value: ["foo", "baz", "quux"]
(Vec<String>
)
Affected lints:
semicolon-inside-block-ignore-singleline
Whether to lint only if it's multiline.
Default Value: false
(bool
)
Affected lints:
semicolon-outside-block-ignore-multiline
Whether to lint only if it's singleline.
Default Value: false
(bool
)
Affected lints:
doc-valid-idents
The list of words this lint should not consider as identifiers needing ticks. The value
".."
can be used as part of the list to indicate, that the configured values should be appended to the
default configuration of Clippy. By default, any configuration will replace the default value. For example:
doc-valid-idents = ["ClipPy"]
would replace the default list with["ClipPy"]
.doc-valid-idents = ["ClipPy", ".."]
would appendClipPy
to the default list.
Default list:
Default Value: ["KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "DirectX", "ECMAScript", "GPLv2", "GPLv3", "GitHub", "GitLab", "IPv4", "IPv6", "ClojureScript", "CoffeeScript", "JavaScript", "PureScript", "TypeScript", "WebAssembly", "NaN", "NaNs", "OAuth", "GraphQL", "OCaml", "OpenGL", "OpenMP", "OpenSSH", "OpenSSL", "OpenStreetMap", "OpenDNS", "WebGL", "TensorFlow", "TrueType", "iOS", "macOS", "FreeBSD", "TeX", "LaTeX", "BibTeX", "BibLaTeX", "MinGW", "CamelCase"]
(Vec<String>
)
Affected lints:
too-many-arguments-threshold
The maximum number of argument a function or method can have
Default Value: 7
(u64
)
Affected lints:
type-complexity-threshold
The maximum complexity a type can have
Default Value: 250
(u64
)
Affected lints:
single-char-binding-names-threshold
The maximum number of single char bindings a scope may have
Default Value: 4
(u64
)
Affected lints:
too-large-for-stack
The maximum size of objects (in bytes) that will be linted. Larger objects are ok on the heap
Default Value: 200
(u64
)
Affected lints:
enum-variant-name-threshold
The minimum number of enum variants for the lints about variant names to trigger
Default Value: 3
(u64
)
Affected lints:
enum-variant-size-threshold
The maximum size of an enum's variant to avoid box suggestion
Default Value: 200
(u64
)
Affected lints:
verbose-bit-mask-threshold
The maximum allowed size of a bit mask before suggesting to use 'trailing_zeros'
Default Value: 1
(u64
)
Affected lints:
literal-representation-threshold
The lower bound for linting decimal literals
Default Value: 16384
(u64
)
Affected lints:
trivial-copy-size-limit
The maximum size (in bytes) to consider a Copy
type for passing by value instead of by reference.
Default Value: None
(Option<u64>
)
Affected lints:
pass-by-value-size-limit
The minimum size (in bytes) to consider a type for passing by reference instead of by value.
Default Value: 256
(u64
)
Affected lints:
too-many-lines-threshold
The maximum number of lines a function or method can have
Default Value: 100
(u64
)
Affected lints:
array-size-threshold
The maximum allowed size for arrays on the stack
Default Value: 512000
(u64
)
Affected lints:
stack-size-threshold
The maximum allowed stack size for functions in bytes
Default Value: 512000
(u64
)
Affected lints:
vec-box-size-threshold
The size of the boxed type in bytes, where boxing in a Vec
is allowed
Default Value: 4096
(u64
)
Affected lints:
max-trait-bounds
The maximum number of bounds a trait can have to be linted
Default Value: 3
(u64
)
Affected lints:
max-struct-bools
The maximum number of bool fields a struct can have
Default Value: 3
(u64
)
Affected lints:
max-fn-params-bools
The maximum number of bool parameters a function can have
Default Value: 3
(u64
)
Affected lints:
warn-on-all-wildcard-imports
Whether to allow certain wildcard imports (prelude, super in tests).
Default Value: false
(bool
)
Affected lints:
disallowed-macros
The list of disallowed macros, written as fully qualified paths.
Default Value: []
(Vec<crate::utils::conf::DisallowedPath>
)
Affected lints:
disallowed-methods
The list of disallowed methods, written as fully qualified paths.
Default Value: []
(Vec<crate::utils::conf::DisallowedPath>
)
Affected lints:
disallowed-types
The list of disallowed types, written as fully qualified paths.
Default Value: []
(Vec<crate::utils::conf::DisallowedPath>
)
Affected lints:
unreadable-literal-lint-fractions
Should the fraction of a decimal be linted to include separators.
Default Value: true
(bool
)
Affected lints:
upper-case-acronyms-aggressive
Enables verbose mode. Triggers if there is more than one uppercase char next to each other
Default Value: false
(bool
)
Affected lints:
matches-for-let-else
Whether the matches should be considered by the lint, and whether there should be filtering for common types.
Default Value: WellKnownTypes
(crate::manual_let_else::MatchLintBehaviour
)
Affected lints:
cargo-ignore-publish
For internal testing only, ignores the current publish
settings in the Cargo manifest.
Default Value: false
(bool
)
Affected lints:
standard-macro-braces
Enforce the named macros always use the braces specified.
A MacroMatcher
can be added like so { name = "macro_name", brace = "(" }
. If the macro
could be used with a full path two MacroMatcher
s have to be added one with the full path
crate_name::macro_name
and one with just the macro name.
Default Value: []
(Vec<crate::nonstandard_macro_braces::MacroMatcher>
)
Affected lints:
enforced-import-renames
The list of imports to always rename, a fully qualified path followed by the rename.
Default Value: []
(Vec<crate::utils::conf::Rename>
)
Affected lints:
allowed-scripts
The list of unicode scripts allowed to be used in the scope.
Default Value: ["Latin"]
(Vec<String>
)
Affected lints:
enable-raw-pointer-heuristic-for-send
Whether to apply the raw pointer heuristic to determine if a type is Send
.
Default Value: true
(bool
)
Affected lints:
max-suggested-slice-pattern-length
When Clippy suggests using a slice pattern, this is the maximum number of elements allowed in
the slice pattern that is suggested. If more elements are necessary, the lint is suppressed.
For example, [_, _, _, e, ..]
is a slice pattern with 4 elements.
Default Value: 3
(u64
)
Affected lints:
await-holding-invalid-types
Default Value: []
(Vec<crate::utils::conf::DisallowedPath>
)
Affected lints:
max-include-file-size
The maximum size of a file included via include_bytes!()
or include_str!()
, in bytes
Default Value: 1000000
(u64
)
Affected lints:
allow-expect-in-tests
Whether expect
should be allowed in test functions or #[cfg(test)]
Default Value: false
(bool
)
Affected lints:
allow-unwrap-in-tests
Whether unwrap
should be allowed in test functions or #[cfg(test)]
Default Value: false
(bool
)
Affected lints:
allow-dbg-in-tests
Whether dbg!
should be allowed in test functions or #[cfg(test)]
Default Value: false
(bool
)
Affected lints:
allow-print-in-tests
Whether print macros (ex. println!
) should be allowed in test functions or #[cfg(test)]
Default Value: false
(bool
)
Affected lints:
large-error-threshold
The maximum size of the Err
-variant in a Result
returned from a function
Default Value: 128
(u64
)
Affected lints:
ignore-interior-mutability
A list of paths to types that should be treated like Arc
, i.e. ignored but
for the generic parameters for determining interior mutability
Default Value: ["bytes::Bytes"]
(Vec<String>
)
Affected lints:
allow-mixed-uninlined-format-args
Whether to allow mixed uninlined format args, e.g. format!("{} {}", a, foo.bar)
Default Value: true
(bool
)
Affected lints:
suppress-restriction-lint-in-const
Whether to suppress a restriction lint in constant code. In same cases the restructured operation might not be unavoidable, as the suggested counterparts are unavailable in constant code. This configuration will cause restriction lints to trigger even if no suggestion can be made.
Default Value: false
(bool
)
Affected lints:
missing-docs-in-crate-items
Whether to only check for missing documentation in items visible within the current
crate. For example, pub(crate)
items.
Default Value: false
(bool
)
Affected lints:
future-size-threshold
The maximum byte size a Future
can have, before it triggers the clippy::large_futures
lint
Default Value: 16384
(u64
)
Affected lints:
unnecessary-box-size
The byte size a T
in Box<T>
can have, below which it triggers the clippy::unnecessary_box
lint
Default Value: 128
(u64
)
Affected lints:
allow-private-module-inception
Whether to allow module inception if it's not public.
Default Value: false
(bool
)
Affected lints:
allowed-idents-below-min-chars
Allowed names below the minimum allowed characters. The value ".."
can be used as part of
the list to indicate, that the configured values should be appended to the default
configuration of Clippy. By default, any configuration will replace the default value.
Default Value: {"j", "z", "i", "y", "n", "x", "w"}
(rustc_data_structures::fx::FxHashSet<String>
)
Affected lints:
min-ident-chars-threshold
Minimum chars an ident can have, anything below or equal to this will be linted.
Default Value: 1
(u64
)
Affected lints:
accept-comment-above-statement
Whether to accept a safety comment to be placed above the statement containing the unsafe
block
Default Value: true
(bool
)
Affected lints:
accept-comment-above-attributes
Whether to accept a safety comment to be placed above the attributes for the unsafe
block
Default Value: true
(bool
)
Affected lints:
allow-one-hash-in-raw-strings
Whether to allow r#""#
when r""
can be used
Default Value: false
(bool
)
Affected lints:
absolute-paths-max-segments
The maximum number of segments a path can have before being linted, anything above this will be linted.
Default Value: 2
(u64
)
Affected lints:
absolute-paths-allowed-crates
Which crates to allow absolute paths from
Default Value: {}
(rustc_data_structures::fx::FxHashSet<String>
)
Affected lints:
allowed-dotfiles
Additional dotfiles (files or directories starting with a dot) to allow
Default Value: {}
(rustc_data_structures::fx::FxHashSet<String>
)
Affected lints:
enforce-iter-loop-reborrow
Example
let mut vec = vec![1, 2, 3];
let rmvec = &mut vec;
for _ in rmvec.iter() {}
for _ in rmvec.iter_mut() {}
Use instead:
let mut vec = vec![1, 2, 3];
let rmvec = &mut vec;
for _ in &*rmvec {}
for _ in &mut *rmvec {}
Default Value: false
(bool
)
Affected lints: