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Auto merge of #104863 - nnethercote:reduce-lint-macros, r=cjgillot

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Reduce macro usage for lints

r? `@cjgillot`
This commit is contained in:
bors 2022-12-02 15:31:15 +00:00
commit e960b5e774
24 changed files with 254 additions and 550 deletions
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91
compiler/rustc_lint/src/early.rs
View file

@ -25,8 +25,6 @@ use rustc_session::Session;
use rustc_span::symbol::Ident;
use rustc_span::Span;
use std::slice;
macro_rules! run_early_pass { ($cx:expr, $f:ident, $($args:expr),*) => ({
$cx.pass.$f(&$cx.context, $($args),*);
}) }
@ -300,20 +298,14 @@ impl LintPass for EarlyLintPassObjects<'_> {
}
}
macro_rules! expand_early_lint_pass_impl_methods {
([$($(#[$attr:meta])* fn $name:ident($($param:ident: $arg:ty),*);)*]) => (
$(fn $name(&mut self, context: &EarlyContext<'_>, $($param: $arg),*) {
for obj in self.lints.iter_mut() {
obj.$name(context, $($param),*);
}
})*
)
}
macro_rules! early_lint_pass_impl {
([], [$($methods:tt)*]) => (
([], [$($(#[$attr:meta])* fn $name:ident($($param:ident: $arg:ty),*);)*]) => (
impl EarlyLintPass for EarlyLintPassObjects<'_> {
expand_early_lint_pass_impl_methods!([$($methods)*]);
$(fn $name(&mut self, context: &EarlyContext<'_>, $($param: $arg),*) {
for obj in self.lints.iter_mut() {
obj.$name(context, $($param),*);
}
})*
}
)
}
@ -371,87 +363,36 @@ impl<'a> EarlyCheckNode<'a> for (ast::NodeId, &'a [ast::Attribute], &'a [P<ast::
}
}
fn early_lint_node<'a>(
sess: &Session,
warn_about_weird_lints: bool,
lint_store: &LintStore,
registered_tools: &RegisteredTools,
buffered: LintBuffer,
pass: impl EarlyLintPass,
check_node: impl EarlyCheckNode<'a>,
) -> LintBuffer {
let mut cx = EarlyContextAndPass {
context: EarlyContext::new(
sess,
warn_about_weird_lints,
lint_store,
registered_tools,
buffered,
),
pass,
};
cx.with_lint_attrs(check_node.id(), check_node.attrs(), |cx| check_node.check(cx));
cx.context.buffered
}
pub fn check_ast_node<'a>(
sess: &Session,
pre_expansion: bool,
lint_store: &LintStore,
registered_tools: &RegisteredTools,
lint_buffer: Option<LintBuffer>,
builtin_lints: impl EarlyLintPass,
builtin_lints: impl EarlyLintPass + 'static,
check_node: impl EarlyCheckNode<'a>,
) {
let passes =
if pre_expansion { &lint_store.pre_expansion_passes } else { &lint_store.early_passes };
let mut passes: Vec<_> = passes.iter().map(|p| (p)()).collect();
let mut buffered = lint_buffer.unwrap_or_default();
passes.push(Box::new(builtin_lints));
if sess.opts.unstable_opts.no_interleave_lints {
for (i, pass) in passes.iter_mut().enumerate() {
buffered =
sess.prof.verbose_generic_activity_with_arg("run_lint", pass.name()).run(|| {
early_lint_node(
sess,
!pre_expansion && i == 0,
lint_store,
registered_tools,
buffered,
EarlyLintPassObjects { lints: slice::from_mut(pass) },
check_node,
)
});
}
} else {
buffered = early_lint_node(
let mut cx = EarlyContextAndPass {
context: EarlyContext::new(
sess,
!pre_expansion,
lint_store,
registered_tools,
buffered,
builtin_lints,
check_node,
);
if !passes.is_empty() {
buffered = early_lint_node(
sess,
false,
lint_store,
registered_tools,
buffered,
EarlyLintPassObjects { lints: &mut passes[..] },
check_node,
);
}
}
lint_buffer.unwrap_or_default(),
),
pass: EarlyLintPassObjects { lints: &mut passes[..] },
};
cx.with_lint_attrs(check_node.id(), check_node.attrs(), |cx| check_node.check(cx));
// All of the buffered lints should have been emitted at this point.
// If not, that means that we somehow buffered a lint for a node id
// that was not lint-checked (perhaps it doesn't exist?). This is a bug.
for (id, lints) in buffered.map {
for (id, lints) in cx.context.buffered.map {
for early_lint in lints {
sess.delay_span_bug(
early_lint.span,

100
compiler/rustc_lint/src/late.rs
View file

@ -28,7 +28,6 @@ use rustc_span::Span;
use std::any::Any;
use std::cell::Cell;
use std::slice;
/// Extract the `LintStore` from the query context.
/// This function exists because we've erased `LintStore` as `dyn Any` in the context.
@ -313,45 +312,42 @@ impl LintPass for LateLintPassObjects<'_, '_> {
}
}
macro_rules! expand_late_lint_pass_impl_methods {
([$hir:tt], [$($(#[$attr:meta])* fn $name:ident($($param:ident: $arg:ty),*);)*]) => (
$(fn $name(&mut self, context: &LateContext<$hir>, $($param: $arg),*) {
for obj in self.lints.iter_mut() {
obj.$name(context, $($param),*);
}
})*
)
}
macro_rules! late_lint_pass_impl {
([], [$hir:tt], $methods:tt) => {
([], [$hir:tt], [$($(#[$attr:meta])* fn $name:ident($($param:ident: $arg:ty),*);)*]) => {
impl<$hir> LateLintPass<$hir> for LateLintPassObjects<'_, $hir> {
expand_late_lint_pass_impl_methods!([$hir], $methods);
$(fn $name(&mut self, context: &LateContext<$hir>, $($param: $arg),*) {
for obj in self.lints.iter_mut() {
obj.$name(context, $($param),*);
}
})*
}
};
}
crate::late_lint_methods!(late_lint_pass_impl, [], ['tcx]);
fn late_lint_mod_pass<'tcx, T: LateLintPass<'tcx>>(
pub(super) fn late_lint_mod<'tcx, T: LateLintPass<'tcx> + 'tcx>(
tcx: TyCtxt<'tcx>,
module_def_id: LocalDefId,
pass: T,
builtin_lints: T,
) {
let effective_visibilities = &tcx.effective_visibilities(());
let context = LateContext {
tcx,
enclosing_body: None,
cached_typeck_results: Cell::new(None),
param_env: ty::ParamEnv::empty(),
effective_visibilities,
effective_visibilities: &tcx.effective_visibilities(()),
lint_store: unerased_lint_store(tcx),
last_node_with_lint_attrs: tcx.hir().local_def_id_to_hir_id(module_def_id),
generics: None,
only_module: true,
};
let mut passes: Vec<_> =
unerased_lint_store(tcx).late_module_passes.iter().map(|pass| (pass)(tcx)).collect();
passes.push(Box::new(builtin_lints));
let pass = LateLintPassObjects { lints: &mut passes[..] };
let mut cx = LateContextAndPass { context, pass };
let (module, _span, hir_id) = tcx.hir().get_module(module_def_id);
@ -365,46 +361,29 @@ fn late_lint_mod_pass<'tcx, T: LateLintPass<'tcx>>(
}
}
pub fn late_lint_mod<'tcx, T: LateLintPass<'tcx>>(
tcx: TyCtxt<'tcx>,
module_def_id: LocalDefId,
builtin_lints: T,
) {
if tcx.sess.opts.unstable_opts.no_interleave_lints {
// These passes runs in late_lint_crate with -Z no_interleave_lints
return;
}
late_lint_mod_pass(tcx, module_def_id, builtin_lints);
let mut passes: Vec<_> =
unerased_lint_store(tcx).late_module_passes.iter().map(|pass| (pass)(tcx)).collect();
if !passes.is_empty() {
late_lint_mod_pass(tcx, module_def_id, LateLintPassObjects { lints: &mut passes[..] });
}
}
fn late_lint_pass_crate<'tcx, T: LateLintPass<'tcx>>(tcx: TyCtxt<'tcx>, pass: T) {
let effective_visibilities = &tcx.effective_visibilities(());
fn late_lint_crate<'tcx, T: LateLintPass<'tcx> + 'tcx>(tcx: TyCtxt<'tcx>, builtin_lints: T) {
let context = LateContext {
tcx,
enclosing_body: None,
cached_typeck_results: Cell::new(None),
param_env: ty::ParamEnv::empty(),
effective_visibilities,
effective_visibilities: &tcx.effective_visibilities(()),
lint_store: unerased_lint_store(tcx),
last_node_with_lint_attrs: hir::CRATE_HIR_ID,
generics: None,
only_module: false,
};
let mut passes =
unerased_lint_store(tcx).late_passes.iter().map(|p| (p)(tcx)).collect::<Vec<_>>();
passes.push(Box::new(builtin_lints));
let pass = LateLintPassObjects { lints: &mut passes[..] };
let mut cx = LateContextAndPass { context, pass };
// Visit the whole crate.
cx.with_lint_attrs(hir::CRATE_HIR_ID, |cx| {
// since the root module isn't visited as an item (because it isn't an
// Since the root module isn't visited as an item (because it isn't an
// item), warn for it here.
lint_callback!(cx, check_crate,);
tcx.hir().walk_toplevel_module(cx);
@ -413,41 +392,8 @@ fn late_lint_pass_crate<'tcx, T: LateLintPass<'tcx>>(tcx: TyCtxt<'tcx>, pass: T)
})
}
fn late_lint_crate<'tcx, T: LateLintPass<'tcx>>(tcx: TyCtxt<'tcx>, builtin_lints: T) {
let mut passes =
unerased_lint_store(tcx).late_passes.iter().map(|p| (p)(tcx)).collect::<Vec<_>>();
if !tcx.sess.opts.unstable_opts.no_interleave_lints {
if !passes.is_empty() {
late_lint_pass_crate(tcx, LateLintPassObjects { lints: &mut passes[..] });
}
late_lint_pass_crate(tcx, builtin_lints);
} else {
for pass in &mut passes {
tcx.sess.prof.verbose_generic_activity_with_arg("run_late_lint", pass.name()).run(
|| {
late_lint_pass_crate(tcx, LateLintPassObjects { lints: slice::from_mut(pass) });
},
);
}
let mut passes: Vec<_> =
unerased_lint_store(tcx).late_module_passes.iter().map(|pass| (pass)(tcx)).collect();
for pass in &mut passes {
tcx.sess
.prof
.verbose_generic_activity_with_arg("run_late_module_lint", pass.name())
.run(|| {
late_lint_pass_crate(tcx, LateLintPassObjects { lints: slice::from_mut(pass) });
});
}
}
}
/// Performs lint checking on a crate.
pub fn check_crate<'tcx, T: LateLintPass<'tcx>>(
pub fn check_crate<'tcx, T: LateLintPass<'tcx> + 'tcx>(
tcx: TyCtxt<'tcx>,
builtin_lints: impl FnOnce() -> T + Send,
) {

269
compiler/rustc_lint/src/lib.rs
View file

@ -127,132 +127,116 @@ fn lint_mod(tcx: TyCtxt<'_>, module_def_id: LocalDefId) {
late::late_lint_mod(tcx, module_def_id, BuiltinCombinedModuleLateLintPass::new());
}
macro_rules! pre_expansion_lint_passes {
($macro:path, $args:tt) => {
$macro!($args, [KeywordIdents: KeywordIdents,]);
};
}
early_lint_methods!(
declare_combined_early_lint_pass,
[
pub BuiltinCombinedPreExpansionLintPass,
[
KeywordIdents: KeywordIdents,
]
]
);
macro_rules! early_lint_passes {
($macro:path, $args:tt) => {
$macro!(
$args,
[
UnusedParens: UnusedParens,
UnusedBraces: UnusedBraces,
UnusedImportBraces: UnusedImportBraces,
UnsafeCode: UnsafeCode,
SpecialModuleName: SpecialModuleName,
AnonymousParameters: AnonymousParameters,
EllipsisInclusiveRangePatterns: EllipsisInclusiveRangePatterns::default(),
NonCamelCaseTypes: NonCamelCaseTypes,
DeprecatedAttr: DeprecatedAttr::new(),
WhileTrue: WhileTrue,
NonAsciiIdents: NonAsciiIdents,
HiddenUnicodeCodepoints: HiddenUnicodeCodepoints,
IncompleteFeatures: IncompleteFeatures,
RedundantSemicolons: RedundantSemicolons,
UnusedDocComment: UnusedDocComment,
UnexpectedCfgs: UnexpectedCfgs,
]
);
};
}
macro_rules! declare_combined_early_pass {
([$name:ident], $passes:tt) => (
early_lint_methods!(declare_combined_early_lint_pass, [pub $name, $passes]);
)
}
pre_expansion_lint_passes!(declare_combined_early_pass, [BuiltinCombinedPreExpansionLintPass]);
early_lint_passes!(declare_combined_early_pass, [BuiltinCombinedEarlyLintPass]);
macro_rules! late_lint_passes {
($macro:path, $args:tt) => {
$macro!(
$args,
[
// Tracks state across modules
UnnameableTestItems: UnnameableTestItems::new(),
// Tracks attributes of parents
MissingDoc: MissingDoc::new(),
// Builds a global list of all impls of `Debug`.
// FIXME: Turn the computation of types which implement Debug into a query
// and change this to a module lint pass
MissingDebugImplementations: MissingDebugImplementations::default(),
// Keeps a global list of foreign declarations.
ClashingExternDeclarations: ClashingExternDeclarations::new(),
]
);
};
}
macro_rules! late_lint_mod_passes {
($macro:path, $args:tt) => {
$macro!(
$args,
[
ForLoopsOverFallibles: ForLoopsOverFallibles,
DerefIntoDynSupertrait: DerefIntoDynSupertrait,
HardwiredLints: HardwiredLints,
ImproperCTypesDeclarations: ImproperCTypesDeclarations,
ImproperCTypesDefinitions: ImproperCTypesDefinitions,
VariantSizeDifferences: VariantSizeDifferences,
BoxPointers: BoxPointers,
PathStatements: PathStatements,
LetUnderscore: LetUnderscore,
// Depends on referenced function signatures in expressions
UnusedResults: UnusedResults,
NonUpperCaseGlobals: NonUpperCaseGlobals,
NonShorthandFieldPatterns: NonShorthandFieldPatterns,
UnusedAllocation: UnusedAllocation,
// Depends on types used in type definitions
MissingCopyImplementations: MissingCopyImplementations,
// Depends on referenced function signatures in expressions
MutableTransmutes: MutableTransmutes,
TypeAliasBounds: TypeAliasBounds,
TrivialConstraints: TrivialConstraints,
TypeLimits: TypeLimits::new(),
NonSnakeCase: NonSnakeCase,
InvalidNoMangleItems: InvalidNoMangleItems,
// Depends on effective visibilities
UnreachablePub: UnreachablePub,
ExplicitOutlivesRequirements: ExplicitOutlivesRequirements,
InvalidValue: InvalidValue,
DerefNullPtr: DerefNullPtr,
// May Depend on constants elsewhere
UnusedBrokenConst: UnusedBrokenConst,
UnstableFeatures: UnstableFeatures,
ArrayIntoIter: ArrayIntoIter::default(),
DropTraitConstraints: DropTraitConstraints,
TemporaryCStringAsPtr: TemporaryCStringAsPtr,
NonPanicFmt: NonPanicFmt,
NoopMethodCall: NoopMethodCall,
EnumIntrinsicsNonEnums: EnumIntrinsicsNonEnums,
InvalidAtomicOrdering: InvalidAtomicOrdering,
NamedAsmLabels: NamedAsmLabels,
OpaqueHiddenInferredBound: OpaqueHiddenInferredBound,
]
);
};
}
macro_rules! declare_combined_late_pass {
([$v:vis $name:ident], $passes:tt) => (
late_lint_methods!(declare_combined_late_lint_pass, [$v $name, $passes], ['tcx]);
)
}
early_lint_methods!(
declare_combined_early_lint_pass,
[
pub BuiltinCombinedEarlyLintPass,
[
UnusedParens: UnusedParens,
UnusedBraces: UnusedBraces,
UnusedImportBraces: UnusedImportBraces,
UnsafeCode: UnsafeCode,
SpecialModuleName: SpecialModuleName,
AnonymousParameters: AnonymousParameters,
EllipsisInclusiveRangePatterns: EllipsisInclusiveRangePatterns::default(),
NonCamelCaseTypes: NonCamelCaseTypes,
DeprecatedAttr: DeprecatedAttr::new(),
WhileTrue: WhileTrue,
NonAsciiIdents: NonAsciiIdents,
HiddenUnicodeCodepoints: HiddenUnicodeCodepoints,
IncompleteFeatures: IncompleteFeatures,
RedundantSemicolons: RedundantSemicolons,
UnusedDocComment: UnusedDocComment,
UnexpectedCfgs: UnexpectedCfgs,
]
]
);
// FIXME: Make a separate lint type which do not require typeck tables
late_lint_passes!(declare_combined_late_pass, [pub BuiltinCombinedLateLintPass]);
late_lint_methods!(
declare_combined_late_lint_pass,
[
pub BuiltinCombinedLateLintPass,
[
// Tracks state across modules
UnnameableTestItems: UnnameableTestItems::new(),
// Tracks attributes of parents
MissingDoc: MissingDoc::new(),
// Builds a global list of all impls of `Debug`.
// FIXME: Turn the computation of types which implement Debug into a query
// and change this to a module lint pass
MissingDebugImplementations: MissingDebugImplementations::default(),
// Keeps a global list of foreign declarations.
ClashingExternDeclarations: ClashingExternDeclarations::new(),
]
],
['tcx]
);
late_lint_mod_passes!(declare_combined_late_pass, [BuiltinCombinedModuleLateLintPass]);
late_lint_methods!(
declare_combined_late_lint_pass,
[
BuiltinCombinedModuleLateLintPass,
[
ForLoopsOverFallibles: ForLoopsOverFallibles,
DerefIntoDynSupertrait: DerefIntoDynSupertrait,
HardwiredLints: HardwiredLints,
ImproperCTypesDeclarations: ImproperCTypesDeclarations,
ImproperCTypesDefinitions: ImproperCTypesDefinitions,
VariantSizeDifferences: VariantSizeDifferences,
BoxPointers: BoxPointers,
PathStatements: PathStatements,
LetUnderscore: LetUnderscore,
// Depends on referenced function signatures in expressions
UnusedResults: UnusedResults,
NonUpperCaseGlobals: NonUpperCaseGlobals,
NonShorthandFieldPatterns: NonShorthandFieldPatterns,
UnusedAllocation: UnusedAllocation,
// Depends on types used in type definitions
MissingCopyImplementations: MissingCopyImplementations,
// Depends on referenced function signatures in expressions
MutableTransmutes: MutableTransmutes,
TypeAliasBounds: TypeAliasBounds,
TrivialConstraints: TrivialConstraints,
TypeLimits: TypeLimits::new(),
NonSnakeCase: NonSnakeCase,
InvalidNoMangleItems: InvalidNoMangleItems,
// Depends on effective visibilities
UnreachablePub: UnreachablePub,
ExplicitOutlivesRequirements: ExplicitOutlivesRequirements,
InvalidValue: InvalidValue,
DerefNullPtr: DerefNullPtr,
// May Depend on constants elsewhere
UnusedBrokenConst: UnusedBrokenConst,
UnstableFeatures: UnstableFeatures,
ArrayIntoIter: ArrayIntoIter::default(),
DropTraitConstraints: DropTraitConstraints,
TemporaryCStringAsPtr: TemporaryCStringAsPtr,
NonPanicFmt: NonPanicFmt,
NoopMethodCall: NoopMethodCall,
EnumIntrinsicsNonEnums: EnumIntrinsicsNonEnums,
InvalidAtomicOrdering: InvalidAtomicOrdering,
NamedAsmLabels: NamedAsmLabels,
OpaqueHiddenInferredBound: OpaqueHiddenInferredBound,
]
],
['tcx]
);
pub fn new_lint_store(no_interleave_lints: bool, internal_lints: bool) -> LintStore {
pub fn new_lint_store(internal_lints: bool) -> LintStore {
let mut lint_store = LintStore::new();
register_builtins(&mut lint_store, no_interleave_lints);
register_builtins(&mut lint_store);
if internal_lints {
register_internals(&mut lint_store);
}
@ -263,54 +247,17 @@ pub fn new_lint_store(no_interleave_lints: bool, internal_lints: bool) -> LintSt
/// Tell the `LintStore` about all the built-in lints (the ones
/// defined in this crate and the ones defined in
/// `rustc_session::lint::builtin`).
fn register_builtins(store: &mut LintStore, no_interleave_lints: bool) {
fn register_builtins(store: &mut LintStore) {
macro_rules! add_lint_group {
($name:expr, $($lint:ident),*) => (
store.register_group(false, $name, None, vec![$(LintId::of($lint)),*]);
)
}
macro_rules! register_early_pass {
($method:ident, $ty:ident, $constructor:expr) => {
store.register_lints(&$ty::get_lints());
store.$method(|| Box::new($constructor));
};
}
macro_rules! register_late_pass {
($method:ident, $ty:ident, $constructor:expr) => {
store.register_lints(&$ty::get_lints());
store.$method(|_| Box::new($constructor));
};
}
macro_rules! register_early_passes {
($method:ident, [$($passes:ident: $constructor:expr,)*]) => (
$(
register_early_pass!($method, $passes, $constructor);
)*
)
}
macro_rules! register_late_passes {
($method:ident, [$($passes:ident: $constructor:expr,)*]) => (
$(
register_late_pass!($method, $passes, $constructor);
)*
)
}
if no_interleave_lints {
pre_expansion_lint_passes!(register_early_passes, register_pre_expansion_pass);
early_lint_passes!(register_early_passes, register_early_pass);
late_lint_passes!(register_late_passes, register_late_pass);
late_lint_mod_passes!(register_late_passes, register_late_mod_pass);
} else {
store.register_lints(&BuiltinCombinedPreExpansionLintPass::get_lints());
store.register_lints(&BuiltinCombinedEarlyLintPass::get_lints());
store.register_lints(&BuiltinCombinedModuleLateLintPass::get_lints());
store.register_lints(&BuiltinCombinedLateLintPass::get_lints());
}
store.register_lints(&BuiltinCombinedPreExpansionLintPass::get_lints());
store.register_lints(&BuiltinCombinedEarlyLintPass::get_lints());
store.register_lints(&BuiltinCombinedModuleLateLintPass::get_lints());
store.register_lints(&BuiltinCombinedLateLintPass::get_lints());
add_lint_group!(
"nonstandard_style",

25
compiler/rustc_lint/src/passes.rs
View file

@ -1,7 +1,6 @@
use crate::context::{EarlyContext, LateContext};
use rustc_ast as ast;
use rustc_data_structures::sync;
use rustc_hir as hir;
use rustc_session::lint::builtin::HardwiredLints;
use rustc_session::lint::LintPass;
@ -66,16 +65,10 @@ macro_rules! late_lint_methods {
// FIXME: eliminate the duplication with `Visitor`. But this also
// contains a few lint-specific methods with no equivalent in `Visitor`.
macro_rules! expand_lint_pass_methods {
($context:ty, [$($(#[$attr:meta])* fn $name:ident($($param:ident: $arg:ty),*);)*]) => (
$(#[inline(always)] fn $name(&mut self, _: $context, $(_: $arg),*) {})*
)
}
macro_rules! declare_late_lint_pass {
([], [$hir:tt], [$($methods:tt)*]) => (
([], [$hir:tt], [$($(#[$attr:meta])* fn $name:ident($($param:ident: $arg:ty),*);)*]) => (
pub trait LateLintPass<$hir>: LintPass {
expand_lint_pass_methods!(&LateContext<$hir>, [$($methods)*]);
$(#[inline(always)] fn $name(&mut self, _: &LateContext<$hir>, $(_: $arg),*) {})*
}
)
}
@ -175,16 +168,10 @@ macro_rules! early_lint_methods {
)
}
macro_rules! expand_early_lint_pass_methods {
($context:ty, [$($(#[$attr:meta])* fn $name:ident($($param:ident: $arg:ty),*);)*]) => (
$(#[inline(always)] fn $name(&mut self, _: $context, $(_: $arg),*) {})*
)
}
macro_rules! declare_early_lint_pass {
([], [$($methods:tt)*]) => (
([], [$($(#[$attr:meta])* fn $name:ident($($param:ident: $arg:ty),*);)*]) => (
pub trait EarlyLintPass: LintPass {
expand_early_lint_pass_methods!(&EarlyContext<'_>, [$($methods)*]);
$(#[inline(always)] fn $name(&mut self, _: &EarlyContext<'_>, $(_: $arg),*) {})*
}
)
}
@ -243,5 +230,5 @@ macro_rules! declare_combined_early_lint_pass {
}
/// A lint pass boxed up as a trait object.
pub type EarlyLintPassObject = Box<dyn EarlyLintPass + sync::Send + 'static>;
pub type LateLintPassObject<'tcx> = Box<dyn LateLintPass<'tcx> + sync::Send + 'tcx>;
pub type EarlyLintPassObject = Box<dyn EarlyLintPass + 'static>;
pub type LateLintPassObject<'tcx> = Box<dyn LateLintPass<'tcx> + 'tcx>;