mirror of
https://github.com/rust-lang/rust.git
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ae5cc9c56e
fix: lint against the functions `LintContext::{lookup_with_diagnostics,lookup,struct_span_lint,lint}`, `TyCtxt::struct_lint_node`, `LintLevelsBuilder::struct_lint`.
576 lines
22 KiB
Rust
576 lines
22 KiB
Rust
//! Lints, aka compiler warnings.
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//!
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//! A 'lint' check is a kind of miscellaneous constraint that a user _might_
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//! want to enforce, but might reasonably want to permit as well, on a
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//! module-by-module basis. They contrast with static constraints enforced by
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//! other phases of the compiler, which are generally required to hold in order
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//! to compile the program at all.
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//!
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//! Most lints can be written as [LintPass] instances. These run after
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//! all other analyses. The `LintPass`es built into rustc are defined
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//! within [rustc_session::lint::builtin],
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//! which has further comments on how to add such a lint.
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//! rustc can also load user-defined lint plugins via the plugin mechanism.
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//!
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//! Some of rustc's lints are defined elsewhere in the compiler and work by
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//! calling `add_lint()` on the overall `Session` object. This works when
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//! it happens before the main lint pass, which emits the lints stored by
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//! `add_lint()`. To emit lints after the main lint pass (from codegen, for
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//! example) requires more effort. See `emit_lint` and `GatherNodeLevels`
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//! in `context.rs`.
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//!
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//! Some code also exists in [rustc_session::lint], [rustc_middle::lint].
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//!
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//! ## Note
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//!
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//! This API is completely unstable and subject to change.
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#![allow(rustc::potential_query_instability)]
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#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
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#![feature(array_windows)]
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#![feature(box_patterns)]
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#![feature(control_flow_enum)]
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#![feature(if_let_guard)]
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#![feature(iter_intersperse)]
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#![feature(iter_order_by)]
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#![feature(let_chains)]
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#![feature(min_specialization)]
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#![feature(never_type)]
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#![feature(rustc_attrs)]
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#![recursion_limit = "256"]
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#[macro_use]
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extern crate rustc_middle;
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#[macro_use]
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extern crate rustc_session;
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#[macro_use]
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extern crate tracing;
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mod array_into_iter;
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pub mod builtin;
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mod context;
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mod early;
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mod enum_intrinsics_non_enums;
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mod errors;
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mod expect;
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mod for_loops_over_fallibles;
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pub mod hidden_unicode_codepoints;
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mod internal;
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mod late;
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mod let_underscore;
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mod levels;
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mod methods;
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mod non_ascii_idents;
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mod non_fmt_panic;
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mod nonstandard_style;
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mod noop_method_call;
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mod opaque_hidden_inferred_bound;
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mod pass_by_value;
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mod passes;
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mod redundant_semicolon;
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mod traits;
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mod types;
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mod unused;
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pub use array_into_iter::ARRAY_INTO_ITER;
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use rustc_ast as ast;
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use rustc_hir as hir;
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use rustc_hir::def_id::LocalDefId;
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use rustc_middle::ty::query::Providers;
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use rustc_middle::ty::TyCtxt;
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use rustc_session::lint::builtin::{
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BARE_TRAIT_OBJECTS, ELIDED_LIFETIMES_IN_PATHS, EXPLICIT_OUTLIVES_REQUIREMENTS,
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};
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use rustc_span::symbol::Ident;
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use rustc_span::Span;
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use array_into_iter::ArrayIntoIter;
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use builtin::*;
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use enum_intrinsics_non_enums::EnumIntrinsicsNonEnums;
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use for_loops_over_fallibles::*;
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use hidden_unicode_codepoints::*;
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use internal::*;
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use let_underscore::*;
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use methods::*;
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use non_ascii_idents::*;
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use non_fmt_panic::NonPanicFmt;
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use nonstandard_style::*;
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use noop_method_call::*;
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use opaque_hidden_inferred_bound::*;
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use pass_by_value::*;
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use redundant_semicolon::*;
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use traits::*;
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use types::*;
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use unused::*;
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/// Useful for other parts of the compiler / Clippy.
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pub use builtin::SoftLints;
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pub use context::{CheckLintNameResult, FindLintError, LintStore};
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pub use context::{EarlyContext, LateContext, LintContext};
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pub use early::{check_ast_node, EarlyCheckNode};
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pub use late::{check_crate, unerased_lint_store};
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pub use passes::{EarlyLintPass, LateLintPass};
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pub use rustc_session::lint::Level::{self, *};
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pub use rustc_session::lint::{BufferedEarlyLint, FutureIncompatibleInfo, Lint, LintId};
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pub use rustc_session::lint::{LintArray, LintPass};
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pub fn provide(providers: &mut Providers) {
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levels::provide(providers);
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expect::provide(providers);
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*providers = Providers { lint_mod, ..*providers };
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}
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fn lint_mod(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
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late::late_lint_mod(tcx, module_def_id, BuiltinCombinedModuleLateLintPass::new());
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}
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macro_rules! pre_expansion_lint_passes {
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($macro:path, $args:tt) => {
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$macro!($args, [KeywordIdents: KeywordIdents,]);
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};
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}
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macro_rules! early_lint_passes {
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($macro:path, $args:tt) => {
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$macro!(
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$args,
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[
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UnusedParens: UnusedParens,
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UnusedBraces: UnusedBraces,
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UnusedImportBraces: UnusedImportBraces,
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UnsafeCode: UnsafeCode,
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SpecialModuleName: SpecialModuleName,
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AnonymousParameters: AnonymousParameters,
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EllipsisInclusiveRangePatterns: EllipsisInclusiveRangePatterns::default(),
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NonCamelCaseTypes: NonCamelCaseTypes,
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DeprecatedAttr: DeprecatedAttr::new(),
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WhileTrue: WhileTrue,
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NonAsciiIdents: NonAsciiIdents,
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HiddenUnicodeCodepoints: HiddenUnicodeCodepoints,
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IncompleteFeatures: IncompleteFeatures,
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RedundantSemicolons: RedundantSemicolons,
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UnusedDocComment: UnusedDocComment,
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UnexpectedCfgs: UnexpectedCfgs,
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]
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);
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};
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}
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macro_rules! declare_combined_early_pass {
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([$name:ident], $passes:tt) => (
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early_lint_methods!(declare_combined_early_lint_pass, [pub $name, $passes]);
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)
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}
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pre_expansion_lint_passes!(declare_combined_early_pass, [BuiltinCombinedPreExpansionLintPass]);
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early_lint_passes!(declare_combined_early_pass, [BuiltinCombinedEarlyLintPass]);
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macro_rules! late_lint_passes {
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($macro:path, $args:tt) => {
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$macro!(
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$args,
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[
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// Tracks state across modules
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UnnameableTestItems: UnnameableTestItems::new(),
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// Tracks attributes of parents
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MissingDoc: MissingDoc::new(),
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// Builds a global list of all impls of `Debug`.
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// FIXME: Turn the computation of types which implement Debug into a query
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// and change this to a module lint pass
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MissingDebugImplementations: MissingDebugImplementations::default(),
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// Keeps a global list of foreign declarations.
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ClashingExternDeclarations: ClashingExternDeclarations::new(),
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]
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);
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};
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}
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macro_rules! late_lint_mod_passes {
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($macro:path, $args:tt) => {
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$macro!(
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$args,
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[
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ForLoopsOverFallibles: ForLoopsOverFallibles,
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HardwiredLints: HardwiredLints,
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ImproperCTypesDeclarations: ImproperCTypesDeclarations,
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ImproperCTypesDefinitions: ImproperCTypesDefinitions,
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VariantSizeDifferences: VariantSizeDifferences,
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BoxPointers: BoxPointers,
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PathStatements: PathStatements,
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LetUnderscore: LetUnderscore,
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// Depends on referenced function signatures in expressions
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UnusedResults: UnusedResults,
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NonUpperCaseGlobals: NonUpperCaseGlobals,
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NonShorthandFieldPatterns: NonShorthandFieldPatterns,
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UnusedAllocation: UnusedAllocation,
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// Depends on types used in type definitions
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MissingCopyImplementations: MissingCopyImplementations,
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// Depends on referenced function signatures in expressions
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MutableTransmutes: MutableTransmutes,
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TypeAliasBounds: TypeAliasBounds,
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TrivialConstraints: TrivialConstraints,
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TypeLimits: TypeLimits::new(),
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NonSnakeCase: NonSnakeCase,
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InvalidNoMangleItems: InvalidNoMangleItems,
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// Depends on effective visibilities
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UnreachablePub: UnreachablePub,
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ExplicitOutlivesRequirements: ExplicitOutlivesRequirements,
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InvalidValue: InvalidValue,
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DerefNullPtr: DerefNullPtr,
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// May Depend on constants elsewhere
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UnusedBrokenConst: UnusedBrokenConst,
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UnstableFeatures: UnstableFeatures,
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ArrayIntoIter: ArrayIntoIter::default(),
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DropTraitConstraints: DropTraitConstraints,
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TemporaryCStringAsPtr: TemporaryCStringAsPtr,
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NonPanicFmt: NonPanicFmt,
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NoopMethodCall: NoopMethodCall,
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EnumIntrinsicsNonEnums: EnumIntrinsicsNonEnums,
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InvalidAtomicOrdering: InvalidAtomicOrdering,
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NamedAsmLabels: NamedAsmLabels,
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OpaqueHiddenInferredBound: OpaqueHiddenInferredBound,
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]
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);
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};
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}
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macro_rules! declare_combined_late_pass {
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([$v:vis $name:ident], $passes:tt) => (
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late_lint_methods!(declare_combined_late_lint_pass, [$v $name, $passes], ['tcx]);
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)
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}
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// FIXME: Make a separate lint type which do not require typeck tables
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late_lint_passes!(declare_combined_late_pass, [pub BuiltinCombinedLateLintPass]);
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late_lint_mod_passes!(declare_combined_late_pass, [BuiltinCombinedModuleLateLintPass]);
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pub fn new_lint_store(no_interleave_lints: bool, internal_lints: bool) -> LintStore {
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let mut lint_store = LintStore::new();
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register_builtins(&mut lint_store, no_interleave_lints);
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if internal_lints {
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register_internals(&mut lint_store);
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}
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lint_store
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}
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/// Tell the `LintStore` about all the built-in lints (the ones
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/// defined in this crate and the ones defined in
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/// `rustc_session::lint::builtin`).
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fn register_builtins(store: &mut LintStore, no_interleave_lints: bool) {
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macro_rules! add_lint_group {
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($name:expr, $($lint:ident),*) => (
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store.register_group(false, $name, None, vec![$(LintId::of($lint)),*]);
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)
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}
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macro_rules! register_early_pass {
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($method:ident, $ty:ident, $constructor:expr) => {
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store.register_lints(&$ty::get_lints());
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store.$method(|| Box::new($constructor));
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};
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}
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macro_rules! register_late_pass {
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($method:ident, $ty:ident, $constructor:expr) => {
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store.register_lints(&$ty::get_lints());
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store.$method(|_| Box::new($constructor));
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};
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}
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macro_rules! register_early_passes {
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($method:ident, [$($passes:ident: $constructor:expr,)*]) => (
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$(
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register_early_pass!($method, $passes, $constructor);
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)*
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)
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}
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macro_rules! register_late_passes {
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($method:ident, [$($passes:ident: $constructor:expr,)*]) => (
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$(
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register_late_pass!($method, $passes, $constructor);
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)*
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)
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}
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if no_interleave_lints {
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pre_expansion_lint_passes!(register_early_passes, register_pre_expansion_pass);
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early_lint_passes!(register_early_passes, register_early_pass);
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late_lint_passes!(register_late_passes, register_late_pass);
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late_lint_mod_passes!(register_late_passes, register_late_mod_pass);
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} else {
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store.register_lints(&BuiltinCombinedPreExpansionLintPass::get_lints());
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store.register_lints(&BuiltinCombinedEarlyLintPass::get_lints());
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store.register_lints(&BuiltinCombinedModuleLateLintPass::get_lints());
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store.register_lints(&BuiltinCombinedLateLintPass::get_lints());
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}
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add_lint_group!(
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"nonstandard_style",
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NON_CAMEL_CASE_TYPES,
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NON_SNAKE_CASE,
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NON_UPPER_CASE_GLOBALS
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);
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add_lint_group!(
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"unused",
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UNUSED_IMPORTS,
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UNUSED_VARIABLES,
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UNUSED_ASSIGNMENTS,
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DEAD_CODE,
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UNUSED_MUT,
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UNREACHABLE_CODE,
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UNREACHABLE_PATTERNS,
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UNUSED_MUST_USE,
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UNUSED_UNSAFE,
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PATH_STATEMENTS,
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UNUSED_ATTRIBUTES,
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UNUSED_MACROS,
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UNUSED_MACRO_RULES,
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UNUSED_ALLOCATION,
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UNUSED_DOC_COMMENTS,
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UNUSED_EXTERN_CRATES,
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UNUSED_FEATURES,
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UNUSED_LABELS,
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UNUSED_PARENS,
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UNUSED_BRACES,
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REDUNDANT_SEMICOLONS
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);
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add_lint_group!("let_underscore", LET_UNDERSCORE_DROP, LET_UNDERSCORE_LOCK);
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add_lint_group!(
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"rust_2018_idioms",
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BARE_TRAIT_OBJECTS,
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UNUSED_EXTERN_CRATES,
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ELLIPSIS_INCLUSIVE_RANGE_PATTERNS,
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ELIDED_LIFETIMES_IN_PATHS,
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EXPLICIT_OUTLIVES_REQUIREMENTS // FIXME(#52665, #47816) not always applicable and not all
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// macros are ready for this yet.
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// UNREACHABLE_PUB,
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// FIXME macro crates are not up for this yet, too much
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// breakage is seen if we try to encourage this lint.
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// MACRO_USE_EXTERN_CRATE
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);
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// Register renamed and removed lints.
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store.register_renamed("single_use_lifetime", "single_use_lifetimes");
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store.register_renamed("elided_lifetime_in_path", "elided_lifetimes_in_paths");
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store.register_renamed("bare_trait_object", "bare_trait_objects");
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store.register_renamed("unstable_name_collision", "unstable_name_collisions");
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store.register_renamed("unused_doc_comment", "unused_doc_comments");
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store.register_renamed("async_idents", "keyword_idents");
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store.register_renamed("exceeding_bitshifts", "arithmetic_overflow");
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store.register_renamed("redundant_semicolon", "redundant_semicolons");
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store.register_renamed("overlapping_patterns", "overlapping_range_endpoints");
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store.register_renamed("safe_packed_borrows", "unaligned_references");
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store.register_renamed("disjoint_capture_migration", "rust_2021_incompatible_closure_captures");
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store.register_renamed("or_patterns_back_compat", "rust_2021_incompatible_or_patterns");
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store.register_renamed("non_fmt_panic", "non_fmt_panics");
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// These were moved to tool lints, but rustc still sees them when compiling normally, before
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// tool lints are registered, so `check_tool_name_for_backwards_compat` doesn't work. Use
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// `register_removed` explicitly.
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const RUSTDOC_LINTS: &[&str] = &[
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"broken_intra_doc_links",
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"private_intra_doc_links",
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"missing_crate_level_docs",
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"missing_doc_code_examples",
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"private_doc_tests",
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"invalid_codeblock_attributes",
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"invalid_html_tags",
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"non_autolinks",
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];
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for rustdoc_lint in RUSTDOC_LINTS {
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store.register_ignored(rustdoc_lint);
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}
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store.register_removed(
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"intra_doc_link_resolution_failure",
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"use `rustdoc::broken_intra_doc_links` instead",
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);
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store.register_removed("rustdoc", "use `rustdoc::all` instead");
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store.register_removed("unknown_features", "replaced by an error");
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store.register_removed("unsigned_negation", "replaced by negate_unsigned feature gate");
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store.register_removed("negate_unsigned", "cast a signed value instead");
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store.register_removed("raw_pointer_derive", "using derive with raw pointers is ok");
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// Register lint group aliases.
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store.register_group_alias("nonstandard_style", "bad_style");
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// This was renamed to `raw_pointer_derive`, which was then removed,
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// so it is also considered removed.
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store.register_removed("raw_pointer_deriving", "using derive with raw pointers is ok");
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store.register_removed("drop_with_repr_extern", "drop flags have been removed");
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store.register_removed("fat_ptr_transmutes", "was accidentally removed back in 2014");
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store.register_removed("deprecated_attr", "use `deprecated` instead");
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store.register_removed(
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"transmute_from_fn_item_types",
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"always cast functions before transmuting them",
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);
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store.register_removed(
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"hr_lifetime_in_assoc_type",
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"converted into hard error, see issue #33685 \
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<https://github.com/rust-lang/rust/issues/33685> for more information",
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);
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store.register_removed(
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"inaccessible_extern_crate",
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"converted into hard error, see issue #36886 \
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<https://github.com/rust-lang/rust/issues/36886> for more information",
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);
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store.register_removed(
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"super_or_self_in_global_path",
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"converted into hard error, see issue #36888 \
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<https://github.com/rust-lang/rust/issues/36888> for more information",
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);
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store.register_removed(
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"overlapping_inherent_impls",
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"converted into hard error, see issue #36889 \
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<https://github.com/rust-lang/rust/issues/36889> for more information",
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);
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store.register_removed(
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"illegal_floating_point_constant_pattern",
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"converted into hard error, see issue #36890 \
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<https://github.com/rust-lang/rust/issues/36890> for more information",
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);
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store.register_removed(
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"illegal_struct_or_enum_constant_pattern",
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"converted into hard error, see issue #36891 \
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<https://github.com/rust-lang/rust/issues/36891> for more information",
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);
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store.register_removed(
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"lifetime_underscore",
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"converted into hard error, see issue #36892 \
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<https://github.com/rust-lang/rust/issues/36892> for more information",
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);
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store.register_removed(
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"extra_requirement_in_impl",
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"converted into hard error, see issue #37166 \
|
|
<https://github.com/rust-lang/rust/issues/37166> for more information",
|
|
);
|
|
store.register_removed(
|
|
"legacy_imports",
|
|
"converted into hard error, see issue #38260 \
|
|
<https://github.com/rust-lang/rust/issues/38260> for more information",
|
|
);
|
|
store.register_removed(
|
|
"coerce_never",
|
|
"converted into hard error, see issue #48950 \
|
|
<https://github.com/rust-lang/rust/issues/48950> for more information",
|
|
);
|
|
store.register_removed(
|
|
"resolve_trait_on_defaulted_unit",
|
|
"converted into hard error, see issue #48950 \
|
|
<https://github.com/rust-lang/rust/issues/48950> for more information",
|
|
);
|
|
store.register_removed(
|
|
"private_no_mangle_fns",
|
|
"no longer a warning, `#[no_mangle]` functions always exported",
|
|
);
|
|
store.register_removed(
|
|
"private_no_mangle_statics",
|
|
"no longer a warning, `#[no_mangle]` statics always exported",
|
|
);
|
|
store.register_removed("bad_repr", "replaced with a generic attribute input check");
|
|
store.register_removed(
|
|
"duplicate_matcher_binding_name",
|
|
"converted into hard error, see issue #57742 \
|
|
<https://github.com/rust-lang/rust/issues/57742> for more information",
|
|
);
|
|
store.register_removed(
|
|
"incoherent_fundamental_impls",
|
|
"converted into hard error, see issue #46205 \
|
|
<https://github.com/rust-lang/rust/issues/46205> for more information",
|
|
);
|
|
store.register_removed(
|
|
"legacy_constructor_visibility",
|
|
"converted into hard error, see issue #39207 \
|
|
<https://github.com/rust-lang/rust/issues/39207> for more information",
|
|
);
|
|
store.register_removed(
|
|
"legacy_directory_ownership",
|
|
"converted into hard error, see issue #37872 \
|
|
<https://github.com/rust-lang/rust/issues/37872> for more information",
|
|
);
|
|
store.register_removed(
|
|
"safe_extern_statics",
|
|
"converted into hard error, see issue #36247 \
|
|
<https://github.com/rust-lang/rust/issues/36247> for more information",
|
|
);
|
|
store.register_removed(
|
|
"parenthesized_params_in_types_and_modules",
|
|
"converted into hard error, see issue #42238 \
|
|
<https://github.com/rust-lang/rust/issues/42238> for more information",
|
|
);
|
|
store.register_removed(
|
|
"duplicate_macro_exports",
|
|
"converted into hard error, see issue #35896 \
|
|
<https://github.com/rust-lang/rust/issues/35896> for more information",
|
|
);
|
|
store.register_removed(
|
|
"nested_impl_trait",
|
|
"converted into hard error, see issue #59014 \
|
|
<https://github.com/rust-lang/rust/issues/59014> for more information",
|
|
);
|
|
store.register_removed("plugin_as_library", "plugins have been deprecated and retired");
|
|
store.register_removed(
|
|
"unsupported_naked_functions",
|
|
"converted into hard error, see RFC 2972 \
|
|
<https://github.com/rust-lang/rfcs/blob/master/text/2972-constrained-naked.md> for more information",
|
|
);
|
|
store.register_removed(
|
|
"mutable_borrow_reservation_conflict",
|
|
"now allowed, see issue #59159 \
|
|
<https://github.com/rust-lang/rust/issues/59159> for more information",
|
|
);
|
|
store.register_removed(
|
|
"const_err",
|
|
"converted into hard error, see issue #71800 \
|
|
<https://github.com/rust-lang/rust/issues/71800> for more information",
|
|
);
|
|
}
|
|
|
|
fn register_internals(store: &mut LintStore) {
|
|
store.register_lints(&LintPassImpl::get_lints());
|
|
store.register_early_pass(|| Box::new(LintPassImpl));
|
|
store.register_lints(&DefaultHashTypes::get_lints());
|
|
store.register_late_pass(|_| Box::new(DefaultHashTypes));
|
|
store.register_lints(&QueryStability::get_lints());
|
|
store.register_late_pass(|_| Box::new(QueryStability));
|
|
store.register_lints(&ExistingDocKeyword::get_lints());
|
|
store.register_late_pass(|_| Box::new(ExistingDocKeyword));
|
|
store.register_lints(&TyTyKind::get_lints());
|
|
store.register_late_pass(|_| Box::new(TyTyKind));
|
|
store.register_lints(&Diagnostics::get_lints());
|
|
store.register_late_pass(|_| Box::new(Diagnostics));
|
|
store.register_lints(&BadOptAccess::get_lints());
|
|
store.register_late_pass(|_| Box::new(BadOptAccess));
|
|
store.register_lints(&PassByValue::get_lints());
|
|
store.register_late_pass(|_| Box::new(PassByValue));
|
|
// FIXME(davidtwco): deliberately do not include `UNTRANSLATABLE_DIAGNOSTIC` and
|
|
// `DIAGNOSTIC_OUTSIDE_OF_IMPL` here because `-Wrustc::internal` is provided to every crate and
|
|
// these lints will trigger all of the time - change this once migration to diagnostic structs
|
|
// and translation is completed
|
|
store.register_group(
|
|
false,
|
|
"rustc::internal",
|
|
None,
|
|
vec![
|
|
LintId::of(DEFAULT_HASH_TYPES),
|
|
LintId::of(POTENTIAL_QUERY_INSTABILITY),
|
|
LintId::of(USAGE_OF_TY_TYKIND),
|
|
LintId::of(PASS_BY_VALUE),
|
|
LintId::of(LINT_PASS_IMPL_WITHOUT_MACRO),
|
|
LintId::of(USAGE_OF_QUALIFIED_TY),
|
|
LintId::of(EXISTING_DOC_KEYWORD),
|
|
LintId::of(BAD_OPT_ACCESS),
|
|
],
|
|
);
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests;
|