Module rustc_lint_defs::builtin
source · Expand description
Some lints that are built in to the compiler.
These are the built-in lints that are emitted direct in the main
compiler code, rather than using their own custom pass. Those
lints are all available in rustc_lint::builtin.
Structs
Does nothing as a lint pass, but registers some
Lints
that are used by other parts of the compiler.Statics
The
absolute_paths_not_starting_with_crate lint detects fully
qualified paths that start with a module name instead of crate,
self, or an extern crate nameThe
arithmetic_overflow lint detects that an arithmetic operation
will overflow.The
asm_sub_register lint detects using only a subset of a register
for inline asm inputs.The
bad_asm_style lint detects the use of the .intel_syntax and
.att_syntax directives.The
bare_trait_objects lint suggests using dyn Trait for trait
objects.The
bindings_with_variant_name lint detects pattern bindings with
the same name as one of the matched variants.The
break_with_label_and_loop lint detects labeled break expressions with
an unlabeled loop as their value expression.The
coherence_leak_check lint detects conflicting implementations of
a trait that are only distinguished by the old leak-check code.The
conflicting_repr_hints lint detects repr attributes with
conflicting hints.The
const_err lint detects an erroneous expression while doing
constant evaluation.The
const_evaluatable_unchecked lint detects a generic constant used
in a type.The
const_item_mutation lint detects attempts to mutate a const
item.The
dead_code lint detects unused, unexported items.The
deprecated lint detects use of deprecated items.The
deprecated_cfg_attr_crate_type_name lint detects uses of the
#![cfg_attr(..., crate_type = "...")] and
#![cfg_attr(..., crate_name = "...")] attributes to conditionally
specify the crate type and name in the source code.The
deprecated_in_future lint is internal to rustc and should not be
used by user code.The
deprecated_where_clause_location lint detects when a where clause in front of the equals
in an associated type.The
deref_into_dyn_supertrait lint is output whenever there is a use of the
Deref implementation with a dyn SuperTrait type as Output.The
duplicate_macro_attributes lint detects when a #[test]-like built-in macro
attribute is duplicated on an item. This lint may trigger on bench, cfg_eval, test
and test_case.The
elided_lifetimes_in_paths lint detects the use of hidden
lifetime parameters.The
explicit_outlives_requirements lint detects unnecessary
lifetime bounds that can be inferred.The
exported_private_dependencies lint detects private dependencies
that are exposed in a public interface.The
ffi_unwind_calls lint detects calls to foreign functions or function pointers with
C-unwind or other FFI-unwind ABIs.The
forbidden_lint_groups lint detects violations of
forbid applied to a lint group. Due to a bug in the compiler,
these used to be overlooked entirely. They now generate a warning.The
function_item_references lint detects function references that are
formatted with fmt::Pointer or transmuted.The
fuzzy_provenance_casts lint detects an as cast between an integer
and a pointer.The
illegal_floating_point_literal_pattern lint detects
floating-point literals used in patterns.The
ill_formed_attribute_input lint detects ill-formed attribute
inputs that were previously accepted and used in practice.The
incomplete_include lint detects the use of the include!
macro with a file that contains more than one expression.The
ineffective_unstable_trait_impl lint detects #[unstable] attributes which are not used.The
invalid_doc_attributes lint detects when the #[doc(...)] is
misused.The
invalid_type_param_default lint detects type parameter defaults
erroneously allowed in an invalid location.The
irrefutable_let_patterns lint detects irrefutable patterns
in if lets, while lets, and if let guards.The
large_assignments lint detects when objects of large
types are being moved around.The
late_bound_lifetime_arguments lint detects generic lifetime
arguments in path segments with late bound lifetime parameters.The
legacy_derive_helpers lint detects derive helper attributes
that are used before they are introduced.The
lossy_provenance_casts lint detects an as cast between a pointer
and an integer.The
macro_expanded_macro_exports_accessed_by_absolute_paths lint
detects macro-expanded macro_export macros from the current crate
that cannot be referred to by absolute paths.The
macro_use_extern_crate lint detects the use of the
macro_use attribute.The
meta_variable_misuse lint detects possible meta-variable misuse
in macro definitions.The
missing_abi lint detects cases where the ABI is omitted from
extern declarations.The
missing_fragment_specifier lint is issued when an unused pattern in a
macro_rules! macro definition has a meta-variable (e.g. $e) that is not
followed by a fragment specifier (e.g. :expr).The
must_not_suspend lint guards against values that shouldn’t be held across suspend points
(.await)The
named_arguments_used_positionally lint detects cases where named arguments are only
used positionally in format strings. This usage is valid but potentially very confusing.The
nontrivial_structural_match lint detects constants that are used in patterns,
whose type is not structural-match and whose initializer body actually uses values
that are not structural-match. So Option<NotStructuralMatch> is ok if the constant
is just None.The
non_exhaustive_omitted_patterns lint detects when a wildcard (_ or ..) in a
pattern for a #[non_exhaustive] struct or enum is reachable.The
order_dependent_trait_objects lint detects a trait coherency
violation that would allow creating two trait impls for the same
dynamic trait object involving marker traits.The
overlapping_range_endpoints lint detects match arms that have range patterns that
overlap on their endpoints.The
patterns_in_fns_without_body lint detects mut identifier
patterns as a parameter in functions without a body.The
pointer_structural_match lint detects pointers used in patterns whose behaviour
cannot be relied upon across compiler versions and optimization levels.The
private_in_public lint detects private items in public
interfaces not caught by the old implementation.The
proc_macro_back_compat lint detects uses of old versions of certain
proc-macro crates, which have hardcoded workarounds in the compiler.The
proc_macro_derive_resolution_fallback lint detects proc macro
derives using inaccessible names from parent modules.The
pub_use_of_private_extern_crate lint detects a specific
situation of re-exporting a private extern crate.The
renamed_and_removed_lints lint detects lints that have been
renamed or removed.The
repr_transparent_external_private_fields lint
detects types marked #[repr(transparent)] that (transitively)
contain an external ZST type marked #[non_exhaustive] or containing
private fieldsThe
rust_2021_incompatible_closure_captures lint detects variables that aren’t completely
captured in Rust 2021, such that the Drop order of their fields may differ between
Rust 2018 and 2021.The
rust_2021_incompatible_or_patterns lint detects usage of old versions of or-patterns.The
rust_2021_prefixes_incompatible_syntax lint detects identifiers that will be parsed as a
prefix instead in Rust 2021.The
rust_2021_prelude_collisions lint detects the usage of trait methods which are ambiguous
with traits added to the prelude in future editions.The
semicolon_in_expressions_from_macros lint detects trailing semicolons
in macro bodies when the macro is invoked in expression position.
This was previous accepted, but is being phased out.The
single_use_lifetimes lint detects lifetimes that are only used
once.The
soft_unstable lint detects unstable features that were
unintentionally allowed on stable.The
stable_features lint detects a feature attribute that
has since been made stable.The
suspicious_auto_trait_impls lint checks for potentially incorrect
implementations of auto traits.The
test_unstable_lint lint tests unstable lints and is perma-unstable.The
text_direction_codepoint_in_comment lint detects Unicode codepoints in comments that
change the visual representation of text on screen in a way that does not correspond to
their on memory representation.The
trivial_casts lint detects trivial casts which could be replaced
with coercion, which may require type ascription or a temporary
variable.The
trivial_numeric_casts lint detects trivial numeric casts of types
which could be removed.The
tyvar_behind_raw_pointer lint detects raw pointer to an
inference variable.The
unaligned_references lint detects unaligned references to fields
of packed structs.The
unconditional_panic lint detects an operation that will cause a
panic at runtime.The
unconditional_recursion lint detects functions that cannot
return without calling themselves.The
undefined_naked_function_abi lint detects naked function definitions that
either do not specify an ABI or specify the Rust ABI.The
unexpected_cfgs lint detects unexpected conditional compilation conditions.The
unfulfilled_lint_expectations lint detects lint trigger expectations
that have not been fulfilled.The
uninhabited_static lint detects uninhabited statics.The
unknown_crate_types lint detects an unknown crate type found in
a crate_type attribute.The
unknown_lints lint detects unrecognized lint attributes.The
unreachable_code lint detects unreachable code paths.The
unreachable_patterns lint detects unreachable patterns.The
unsafe_op_in_unsafe_fn lint detects unsafe operations in unsafe
functions without an explicit unsafe block.The
unstable_name_collisions lint detects that you have used a name
that the standard library plans to add in the future.The
unstable_syntax_pre_expansion lint detects the use of unstable
syntax that is discarded during attribute expansion.The
unsupported_calling_conventions lint is output whenever there is a use of the
stdcall, fastcall, thiscall, vectorcall calling conventions (or their unwind
variants) on targets that cannot meaningfully be supported for the requested target.The
unused_assignments lint detects assignments that will never be read.The
unused_attributes lint detects attributes that were not used by
the compiler.The
unused_crate_dependencies lint detects crate dependencies that
are never used.The
unused_doc_comments lint detects doc comments that aren’t used
by rustdoc.The
unused_extern_crates lint guards against extern crate items
that are never used.The
unused_features lint detects unused or unknown features found in
crate-level feature attributes.The
unused_imports lint detects imports that are never used.The
unused_labels lint detects labels that are never used.The
unused_lifetimes lint detects lifetime parameters that are never
used.The
unused_macros lint detects macros that were not used.The
unused_macro_rules lint detects macro rules that were not used.The
unused_mut lint detects mut variables which don’t need to be
mutable.The
unused_qualifications lint detects unnecessarily qualified
names.The
unused_tuple_struct_fields lint detects fields of tuple structs
that are never read.The
unused_unsafe lint detects unnecessary use of an unsafe block.The
unused_variables lint detects variables which are not used in
any way.The
useless_deprecated lint detects deprecation attributes with no effect.The
warnings lint allows you to change the level of other
lints which produce warnings.