Module rustc_lint_defs::builtin

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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

Statics

  • ABSOLUTE_PATHS_NOT_STARTING_WITH_CRATE
    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 name
  • AMBIGUOUS_ASSOCIATED_ITEMS
    The ambiguous_associated_items lint detects ambiguity between associated items and enum variants.
  • ARITHMETIC_OVERFLOW
    The arithmetic_overflow lint detects that an arithmetic operation will overflow.
  • ASM_SUB_REGISTER
    The asm_sub_register lint detects using only a subset of a register for inline asm inputs.
  • BAD_ASM_STYLE
    The bad_asm_style lint detects the use of the .intel_syntax and .att_syntax directives.
  • BARE_TRAIT_OBJECTS
    The bare_trait_objects lint suggests using dyn Trait for trait objects.
  • BINDINGS_WITH_VARIANT_NAME
    The bindings_with_variant_name lint detects pattern bindings with the same name as one of the matched variants.
  • BREAK_WITH_LABEL_AND_LOOP
    The break_with_label_and_loop lint detects labeled break expressions with an unlabeled loop as their value expression.
  • BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE
    The byte_slice_in_packed_struct_with_derive lint detects cases where a byte slice field ([u8]) or string slice field (str) is used in a packed struct that derives one or more built-in traits.
  • CENUM_IMPL_DROP_CAST
    The cenum_impl_drop_cast lint detects an as cast of a field-less enum that implements Drop.
  • COHERENCE_LEAK_CHECK
    The coherence_leak_check lint detects conflicting implementations of a trait that are only distinguished by the old leak-check code.
  • CONFLICTING_REPR_HINTS
    The conflicting_repr_hints lint detects repr attributes with conflicting hints.
  • CONST_EVALUATABLE_UNCHECKED
    The const_evaluatable_unchecked lint detects a generic constant used in a type.
  • CONST_ITEM_MUTATION
    The const_item_mutation lint detects attempts to mutate a const item.
  • DEAD_CODE
    The dead_code lint detects unused, unexported items.
  • DEPRECATED
    The deprecated lint detects use of deprecated items.
  • DEPRECATED_CFG_ATTR_CRATE_TYPE_NAME
    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.
  • DEPRECATED_IN_FUTURE
    The deprecated_in_future lint is internal to rustc and should not be used by user code.
  • DEPRECATED_WHERE_CLAUSE_LOCATION
    The deprecated_where_clause_location lint detects when a where clause in front of the equals in an associated type.
  • DUPLICATE_MACRO_ATTRIBUTES
    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.
  • ELIDED_LIFETIMES_IN_PATHS
    The elided_lifetimes_in_paths lint detects the use of hidden lifetime parameters.
  • EXPLICIT_OUTLIVES_REQUIREMENTS
    The explicit_outlives_requirements lint detects unnecessary lifetime bounds that can be inferred.
  • EXPORTED_PRIVATE_DEPENDENCIES
    The exported_private_dependencies lint detects private dependencies that are exposed in a public interface.
  • FFI_UNWIND_CALLS
    The ffi_unwind_calls lint detects calls to foreign functions or function pointers with C-unwind or other FFI-unwind ABIs.
  • FORBIDDEN_LINT_GROUPS
    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.
  • FUNCTION_ITEM_REFERENCES
    The function_item_references lint detects function references that are formatted with fmt::Pointer or transmuted.
  • FUZZY_PROVENANCE_CASTS
    The fuzzy_provenance_casts lint detects an as cast between an integer and a pointer.
  • ILLEGAL_FLOATING_POINT_LITERAL_PATTERN
    The illegal_floating_point_literal_pattern lint detects floating-point literals used in patterns.
  • ILL_FORMED_ATTRIBUTE_INPUT
    The ill_formed_attribute_input lint detects ill-formed attribute inputs that were previously accepted and used in practice.
  • IMPLIED_BOUNDS_ENTAILMENT
    The implied_bounds_entailment lint detects cases where the arguments of an impl method have stronger implied bounds than those from the trait method it’s implementing.
  • INCOMPLETE_INCLUDE
    The incomplete_include lint detects the use of the include! macro with a file that contains more than one expression.
  • INDIRECT_STRUCTURAL_MATCH
    The indirect_structural_match lint detects a const in a pattern that manually implements PartialEq and Eq.
  • INEFFECTIVE_UNSTABLE_TRAIT_IMPL
    The ineffective_unstable_trait_impl lint detects #[unstable] attributes which are not used.
  • INLINE_NO_SANITIZE
    The inline_no_sanitize lint detects incompatible use of #[inline(always)] and #[no_sanitize(...)].
  • INVALID_ALIGNMENT
    The invalid_alignment lint detects dereferences of misaligned pointers during constant evluation.
  • INVALID_DOC_ATTRIBUTES
    The invalid_doc_attributes lint detects when the #[doc(...)] is misused.
  • INVALID_MACRO_EXPORT_ARGUMENTS
    The invalid_macro_export_arguments lint detects cases where #[macro_export] is being used with invalid arguments.
  • INVALID_TYPE_PARAM_DEFAULT
    The invalid_type_param_default lint detects type parameter defaults erroneously allowed in an invalid location.
  • IRREFUTABLE_LET_PATTERNS
    The irrefutable_let_patterns lint detects irrefutable patterns in if lets, while lets, and if let guards.
  • LARGE_ASSIGNMENTS
    The large_assignments lint detects when objects of large types are being moved around.
  • LATE_BOUND_LIFETIME_ARGUMENTS
    The late_bound_lifetime_arguments lint detects generic lifetime arguments in path segments with late bound lifetime parameters.
  • LEGACY_DERIVE_HELPERS
    The legacy_derive_helpers lint detects derive helper attributes that are used before they are introduced.
  • LOSSY_PROVENANCE_CASTS
    The lossy_provenance_casts lint detects an as cast between a pointer and an integer.
  • MACRO_EXPANDED_MACRO_EXPORTS_ACCESSED_BY_ABSOLUTE_PATHS
    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.
  • MACRO_USE_EXTERN_CRATE
    The macro_use_extern_crate lint detects the use of the macro_use attribute.
  • META_VARIABLE_MISUSE
    The meta_variable_misuse lint detects possible meta-variable misuse in macro definitions.
  • MISSING_ABI
    The missing_abi lint detects cases where the ABI is omitted from extern declarations.
  • MISSING_FRAGMENT_SPECIFIER
    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).
  • MUST_NOT_SUSPEND
    The must_not_suspend lint guards against values that shouldn’t be held across suspend points (.await)
  • NAMED_ARGUMENTS_USED_POSITIONALLY
    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.
  • NONTRIVIAL_STRUCTURAL_MATCH
    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.
  • NON_EXHAUSTIVE_OMITTED_PATTERNS
    The non_exhaustive_omitted_patterns lint detects when a wildcard (_ or ..) in a pattern for a #[non_exhaustive] struct or enum is reachable.
  • ORDER_DEPENDENT_TRAIT_OBJECTS
    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.
  • OVERLAPPING_RANGE_ENDPOINTS
    The overlapping_range_endpoints lint detects match arms that have range patterns that overlap on their endpoints.
  • PATTERNS_IN_FNS_WITHOUT_BODY
    The patterns_in_fns_without_body lint detects mut identifier patterns as a parameter in functions without a body.
  • POINTER_STRUCTURAL_MATCH
    The pointer_structural_match lint detects pointers used in patterns whose behaviour cannot be relied upon across compiler versions and optimization levels.
  • PRIVATE_IN_PUBLIC
    The private_in_public lint detects private items in public interfaces not caught by the old implementation.
  • PROC_MACRO_BACK_COMPAT
    The proc_macro_back_compat lint detects uses of old versions of certain proc-macro crates, which have hardcoded workarounds in the compiler.
  • PROC_MACRO_DERIVE_RESOLUTION_FALLBACK
    The proc_macro_derive_resolution_fallback lint detects proc macro derives using inaccessible names from parent modules.
  • PUB_USE_OF_PRIVATE_EXTERN_CRATE
    The pub_use_of_private_extern_crate lint detects a specific situation of re-exporting a private extern crate.
  • RENAMED_AND_REMOVED_LINTS
    The renamed_and_removed_lints lint detects lints that have been renamed or removed.
  • REPR_TRANSPARENT_EXTERNAL_PRIVATE_FIELDS
    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 fields
  • RUST_2021_INCOMPATIBLE_CLOSURE_CAPTURES
    The 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.
  • RUST_2021_INCOMPATIBLE_OR_PATTERNS
    The rust_2021_incompatible_or_patterns lint detects usage of old versions of or-patterns.
  • RUST_2021_PREFIXES_INCOMPATIBLE_SYNTAX
    The rust_2021_prefixes_incompatible_syntax lint detects identifiers that will be parsed as a prefix instead in Rust 2021.
  • RUST_2021_PRELUDE_COLLISIONS
    The rust_2021_prelude_collisions lint detects the usage of trait methods which are ambiguous with traits added to the prelude in future editions.
  • SEMICOLON_IN_EXPRESSIONS_FROM_MACROS
    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.
  • SINGLE_USE_LIFETIMES
    The single_use_lifetimes lint detects lifetimes that are only used once.
  • SOFT_UNSTABLE
    The soft_unstable lint detects unstable features that were unintentionally allowed on stable.
  • STABLE_FEATURES
    The stable_features lint detects a feature attribute that has since been made stable.
  • SUSPICIOUS_AUTO_TRAIT_IMPLS
    The suspicious_auto_trait_impls lint checks for potentially incorrect implementations of auto traits.
  • TEST_UNSTABLE_LINT
    The test_unstable_lint lint tests unstable lints and is perma-unstable.
  • TEXT_DIRECTION_CODEPOINT_IN_COMMENT
    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.
  • TRIVIAL_CASTS
    The trivial_casts lint detects trivial casts which could be replaced with coercion, which may require a temporary variable.
  • TRIVIAL_NUMERIC_CASTS
    The trivial_numeric_casts lint detects trivial numeric casts of types which could be removed.
  • TYVAR_BEHIND_RAW_POINTER
    The tyvar_behind_raw_pointer lint detects raw pointer to an inference variable.
  • UNCONDITIONAL_PANIC
    The unconditional_panic lint detects an operation that will cause a panic at runtime.
  • UNCONDITIONAL_RECURSION
    The unconditional_recursion lint detects functions that cannot return without calling themselves.
  • UNDEFINED_NAKED_FUNCTION_ABI
    The undefined_naked_function_abi lint detects naked function definitions that either do not specify an ABI or specify the Rust ABI.
  • UNEXPECTED_CFGS
    The unexpected_cfgs lint detects unexpected conditional compilation conditions.
  • UNFULFILLED_LINT_EXPECTATIONS
    The unfulfilled_lint_expectations lint detects lint trigger expectations that have not been fulfilled.
  • UNINHABITED_STATIC
    The uninhabited_static lint detects uninhabited statics.
  • UNKNOWN_CRATE_TYPES
    The unknown_crate_types lint detects an unknown crate type found in a crate_type attribute.
  • UNKNOWN_LINTS
    The unknown_lints lint detects unrecognized lint attributes.
  • UNREACHABLE_CODE
    The unreachable_code lint detects unreachable code paths.
  • UNREACHABLE_PATTERNS
    The unreachable_patterns lint detects unreachable patterns.
  • UNSAFE_OP_IN_UNSAFE_FN
    The unsafe_op_in_unsafe_fn lint detects unsafe operations in unsafe functions without an explicit unsafe block.
  • UNSTABLE_NAME_COLLISIONS
    The unstable_name_collisions lint detects that you have used a name that the standard library plans to add in the future.
  • UNSTABLE_SYNTAX_PRE_EXPANSION
    The unstable_syntax_pre_expansion lint detects the use of unstable syntax that is discarded during attribute expansion.
  • UNSUPPORTED_CALLING_CONVENTIONS
    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.
  • UNUSED_ASSIGNMENTS
    The unused_assignments lint detects assignments that will never be read.
  • UNUSED_ATTRIBUTES
    The unused_attributes lint detects attributes that were not used by the compiler.
  • UNUSED_CRATE_DEPENDENCIES
    The unused_crate_dependencies lint detects crate dependencies that are never used.
  • UNUSED_DOC_COMMENTS
    The unused_doc_comments lint detects doc comments that aren’t used by rustdoc.
  • UNUSED_EXTERN_CRATES
    The unused_extern_crates lint guards against extern crate items that are never used.
  • UNUSED_FEATURES
    The unused_features lint detects unused or unknown features found in crate-level feature attributes.
  • UNUSED_IMPORTS
    The unused_imports lint detects imports that are never used.
  • UNUSED_LABELS
    The unused_labels lint detects labels that are never used.
  • UNUSED_LIFETIMES
    The unused_lifetimes lint detects lifetime parameters that are never used.
  • UNUSED_MACROS
    The unused_macros lint detects macros that were not used.
  • UNUSED_MACRO_RULES
    The unused_macro_rules lint detects macro rules that were not used.
  • UNUSED_MUT
    The unused_mut lint detects mut variables which don’t need to be mutable.
  • UNUSED_QUALIFICATIONS
    The unused_qualifications lint detects unnecessarily qualified names.
  • UNUSED_TUPLE_STRUCT_FIELDS
    The unused_tuple_struct_fields lint detects fields of tuple structs that are never read.
  • UNUSED_UNSAFE
    The unused_unsafe lint detects unnecessary use of an unsafe block.
  • UNUSED_VARIABLES
    The unused_variables lint detects variables which are not used in any way.
  • USELESS_DEPRECATED
    The useless_deprecated lint detects deprecation attributes with no effect.
  • WARNINGS
    The warnings lint allows you to change the level of other lints which produce warnings.
  • WHERE_CLAUSES_OBJECT_SAFETY
    The where_clauses_object_safety lint detects for object safety of where clauses.