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rustc_lint: Prevent triplication of various lints #119388

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merged 5 commits into from
Dec 30, 2023
Merged

rustc_lint: Prevent triplication of various lints #119388

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a4bcd47
rustc_error_codes: Update expected error in E0453.md
Enselic Dec 28, 2023
eef02c4
rustc_lint: Rename `warn_about_weird_lints` to `lint_added_lints`
Enselic Dec 28, 2023
e0c626f
rustc_lint: Prevent multiple 'lint ignored' lints
Enselic Dec 28, 2023
741884d
rustc_lint: Prevent multiple 'incompatible with previous forbid' lints
Enselic Dec 28, 2023
7ca4e9f
rustc_lint: Prevent triplication of 'unknown lint' lint
Enselic Dec 28, 2023
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4 changes: 2 additions & 2 deletions compiler/rustc_error_codes/src/error_codes/E0453.md
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Original file line number Diff line number Diff line change
Expand Up @@ -8,8 +8,8 @@ Example of erroneous code:

#[allow(non_snake_case)]
fn main() {
let MyNumber = 2; // error: allow(non_snake_case) overruled by outer
// forbid(non_snake_case)
// error: allow(non_snake_case) incompatible with previous forbid
let MyNumber = 2;
}
```

Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_lint/src/context.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1069,7 +1069,7 @@ impl<'a> EarlyContext<'a> {
pub(crate) fn new(
sess: &'a Session,
features: &'a Features,
warn_about_weird_lints: bool,
lint_added_lints: bool,
lint_store: &'a LintStore,
registered_tools: &'a RegisteredTools,
buffered: LintBuffer,
Expand All @@ -1078,7 +1078,7 @@ impl<'a> EarlyContext<'a> {
builder: LintLevelsBuilder::new(
sess,
features,
warn_about_weird_lints,
lint_added_lints,
lint_store,
registered_tools,
),
Expand Down
62 changes: 31 additions & 31 deletions compiler/rustc_lint/src/levels.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -135,7 +135,7 @@ fn lint_expectations(tcx: TyCtxt<'_>, (): ()) -> Vec<(LintExpectationId, LintExp
unstable_to_stable_ids: FxHashMap::default(),
empty: FxHashMap::default(),
},
warn_about_weird_lints: false,
lint_added_lints: false,
store,
registered_tools: tcx.registered_tools(()),
};
Expand Down Expand Up @@ -164,7 +164,7 @@ fn shallow_lint_levels_on(tcx: TyCtxt<'_>, owner: hir::OwnerId) -> ShallowLintLe
empty: FxHashMap::default(),
attrs,
},
warn_about_weird_lints: false,
lint_added_lints: false,
store,
registered_tools: tcx.registered_tools(()),
};
Expand Down Expand Up @@ -451,7 +451,7 @@ pub struct LintLevelsBuilder<'s, P> {
sess: &'s Session,
features: &'s Features,
provider: P,
warn_about_weird_lints: bool,
lint_added_lints: bool,
store: &'s LintStore,
registered_tools: &'s RegisteredTools,
}
Expand All @@ -464,15 +464,15 @@ impl<'s> LintLevelsBuilder<'s, TopDown> {
pub(crate) fn new(
sess: &'s Session,
features: &'s Features,
warn_about_weird_lints: bool,
lint_added_lints: bool,
store: &'s LintStore,
registered_tools: &'s RegisteredTools,
) -> Self {
let mut builder = LintLevelsBuilder {
sess,
features,
provider: TopDown { sets: LintLevelSets::new(), cur: COMMAND_LINE },
warn_about_weird_lints,
lint_added_lints,
store,
registered_tools,
};
Expand Down Expand Up @@ -642,7 +642,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
//
// This means that this only errors if we're truly lowering the lint
// level from forbid.
if level != Level::Forbid {
if self.lint_added_lints && level != Level::Forbid {
if let Level::Forbid = old_level {
// Backwards compatibility check:
//
Expand Down Expand Up @@ -968,7 +968,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
continue;
}

_ if !self.warn_about_weird_lints => {}
_ if !self.lint_added_lints => {}

CheckLintNameResult::Renamed(ref replace) => {
let suggestion =
Expand Down Expand Up @@ -1029,7 +1029,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
}
}

if !is_crate_node {
if self.lint_added_lints && !is_crate_node {
for (id, &(level, ref src)) in self.current_specs().iter() {
if !id.lint.crate_level_only {
continue;
Expand All @@ -1054,33 +1054,33 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
/// Checks if the lint is gated on a feature that is not enabled.
///
/// Returns `true` if the lint's feature is enabled.
// FIXME only emit this once for each attribute, instead of repeating it 4 times for
// pre-expansion lints, post-expansion lints, `shallow_lint_levels_on` and `lint_expectations`.
#[track_caller]
fn check_gated_lint(&self, lint_id: LintId, span: Span, lint_from_cli: bool) -> bool {
if let Some(feature) = lint_id.lint.feature_gate {
if !self.features.active(feature) {
let lint = builtin::UNKNOWN_LINTS;
let (level, src) = self.lint_level(builtin::UNKNOWN_LINTS);
struct_lint_level(
self.sess,
lint,
level,
src,
Some(span.into()),
fluent::lint_unknown_gated_lint,
|lint| {
lint.set_arg("name", lint_id.lint.name_lower());
lint.note(fluent::lint_note);
rustc_session::parse::add_feature_diagnostics_for_issue(
lint,
&self.sess.parse_sess,
feature,
GateIssue::Language,
lint_from_cli,
);
},
);
if self.lint_added_lints {
let lint = builtin::UNKNOWN_LINTS;
let (level, src) = self.lint_level(builtin::UNKNOWN_LINTS);
struct_lint_level(
self.sess,
lint,
level,
src,
Some(span.into()),
fluent::lint_unknown_gated_lint,
|lint| {
lint.set_arg("name", lint_id.lint.name_lower());
lint.note(fluent::lint_note);
rustc_session::parse::add_feature_diagnostics_for_issue(
lint,
&self.sess.parse_sess,
feature,
GateIssue::Language,
lint_from_cli,
);
},
);
}
return false;
}
}
Expand Down
1 change: 0 additions & 1 deletion tests/ui/error-codes/E0453.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,5 @@

#[allow(non_snake_case)]
//~^ ERROR allow(non_snake_case) incompatible
//~| ERROR allow(non_snake_case) incompatible
fn main() {
}
13 changes: 1 addition & 12 deletions tests/ui/error-codes/E0453.stderr
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Original file line number Diff line number Diff line change
Expand Up @@ -7,17 +7,6 @@ LL |
LL | #[allow(non_snake_case)]
| ^^^^^^^^^^^^^^ overruled by previous forbid

error[E0453]: allow(non_snake_case) incompatible with previous forbid
--> $DIR/E0453.rs:3:9
|
LL | #![forbid(non_snake_case)]
| -------------- `forbid` level set here
LL |
LL | #[allow(non_snake_case)]
| ^^^^^^^^^^^^^^ overruled by previous forbid
|
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: aborting due to 2 previous errors
error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0453`.
4 changes: 0 additions & 4 deletions tests/ui/feature-gates/feature-gate-multiple_supertrait_upcastable.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,11 +2,7 @@

#![deny(multiple_supertrait_upcastable)]
//~^ WARNING unknown lint: `multiple_supertrait_upcastable`
//~| WARNING unknown lint: `multiple_supertrait_upcastable`
//~| WARNING unknown lint: `multiple_supertrait_upcastable`
#![warn(multiple_supertrait_upcastable)]
//~^ WARNING unknown lint: `multiple_supertrait_upcastable`
//~| WARNING unknown lint: `multiple_supertrait_upcastable`
//~| WARNING unknown lint: `multiple_supertrait_upcastable`

fn main() {}
44 changes: 2 additions & 42 deletions tests/ui/feature-gates/feature-gate-multiple_supertrait_upcastable.stderr
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Original file line number Diff line number Diff line change
Expand Up @@ -9,53 +9,13 @@ LL | #![deny(multiple_supertrait_upcastable)]
= note: `#[warn(unknown_lints)]` on by default

warning: unknown lint: `multiple_supertrait_upcastable`
--> $DIR/feature-gate-multiple_supertrait_upcastable.rs:7:1
--> $DIR/feature-gate-multiple_supertrait_upcastable.rs:5:1
|
LL | #![warn(multiple_supertrait_upcastable)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: the `multiple_supertrait_upcastable` lint is unstable
= help: add `#![feature(multiple_supertrait_upcastable)]` to the crate attributes to enable

warning: unknown lint: `multiple_supertrait_upcastable`
--> $DIR/feature-gate-multiple_supertrait_upcastable.rs:3:1
|
LL | #![deny(multiple_supertrait_upcastable)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: the `multiple_supertrait_upcastable` lint is unstable
= help: add `#![feature(multiple_supertrait_upcastable)]` to the crate attributes to enable
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

warning: unknown lint: `multiple_supertrait_upcastable`
--> $DIR/feature-gate-multiple_supertrait_upcastable.rs:7:1
|
LL | #![warn(multiple_supertrait_upcastable)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: the `multiple_supertrait_upcastable` lint is unstable
= help: add `#![feature(multiple_supertrait_upcastable)]` to the crate attributes to enable
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

warning: unknown lint: `multiple_supertrait_upcastable`
--> $DIR/feature-gate-multiple_supertrait_upcastable.rs:3:1
|
LL | #![deny(multiple_supertrait_upcastable)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: the `multiple_supertrait_upcastable` lint is unstable
= help: add `#![feature(multiple_supertrait_upcastable)]` to the crate attributes to enable
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

warning: unknown lint: `multiple_supertrait_upcastable`
--> $DIR/feature-gate-multiple_supertrait_upcastable.rs:7:1
|
LL | #![warn(multiple_supertrait_upcastable)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: the `multiple_supertrait_upcastable` lint is unstable
= help: add `#![feature(multiple_supertrait_upcastable)]` to the crate attributes to enable
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

warning: 6 warnings emitted
warning: 2 warnings emitted

10 changes: 0 additions & 10 deletions tests/ui/feature-gates/feature-gate-non_exhaustive_omitted_patterns_lint.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,12 +2,8 @@

#![deny(non_exhaustive_omitted_patterns)]
//~^ WARNING unknown lint: `non_exhaustive_omitted_patterns`
//~| WARNING unknown lint: `non_exhaustive_omitted_patterns`
//~| WARNING unknown lint: `non_exhaustive_omitted_patterns`
#![allow(non_exhaustive_omitted_patterns)]
//~^ WARNING unknown lint: `non_exhaustive_omitted_patterns`
//~| WARNING unknown lint: `non_exhaustive_omitted_patterns`
//~| WARNING unknown lint: `non_exhaustive_omitted_patterns`

fn main() {
enum Foo {
Expand All @@ -19,9 +15,6 @@ fn main() {
#[allow(non_exhaustive_omitted_patterns)]
//~^ WARNING unknown lint: `non_exhaustive_omitted_patterns`
//~| WARNING unknown lint: `non_exhaustive_omitted_patterns`
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Why does it still appear twice?

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@Enselic Enselic Dec 29, 2023 •
edited
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It is emitted twice via with_lint_attrs(), first from visit_stmt() and then from visit_expr() (from inside visit_stmt()). For reference, the code looks like this:

    fn visit_expr(&mut self, e: &'a ast::Expr) {
        self.with_lint_attrs(e.id, &e.attrs, |cx| {
            lint_callback!(cx, check_expr, e);
            ast_visit::walk_expr(cx, e);
        })
    }

   // ...

    fn visit_stmt(&mut self, s: &'a ast::Stmt) {
        // Add the statement's lint attributes to our
        // current state when checking the statement itself.
        // This allows us to handle attributes like
        // `#[allow(unused_doc_comments)]`, which apply to
        // sibling attributes on the same target
        //
        // Note that statements get their attributes from
        // the AST struct that they wrap (e.g. an item)
        self.with_lint_attrs(s.id, s.attrs(), |cx| {
            lint_callback!(cx, check_stmt, s);
            cx.check_id(s.id);
        });
        // The visitor for the AST struct wrapped
        // by the statement (e.g. `Item`) will call
        // `with_lint_attrs`, so do this walk
        // outside of the above `with_lint_attrs` call
        ast_visit::walk_stmt(self, s);
    }

I can look into fixing that, but I would prefer to do it in a separate PR after this PR lands since it is a separate problem.

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@Enselic Enselic Dec 29, 2023 •
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For reference, here is the top of the backtrace of err.emit() of the second emit:

backtrace 
rustc_middle::lint::struct_lint_level::struct_lint_level_impl::<rustc_error_messages::DiagnosticMessage> (\home\martin\src\rust\compiler\rustc_middle\src\lint.rs:406)
rustc_middle::lint::struct_lint_level::<rustc_error_messages::DiagnosticMessage, <rustc_lint::levels::LintLevelsBuilder<rustc_lint::levels::TopDown>>::check_gated_lint::{closure#0}> (\home\martin\src\rust\compiler\rustc_middle\src\lint.rs:408)
<rustc_lint::levels::LintLevelsBuilder<rustc_lint::levels::TopDown>>::check_gated_lint (\home\martin\src\rust\compiler\rustc_lint\src\levels.rs:1064)
<rustc_lint::levels::LintLevelsBuilder<rustc_lint::levels::TopDown>>::add (\home\martin\src\rust\compiler\rustc_lint\src\levels.rs:897)
<rustc_lint::levels::LintLevelsBuilder<rustc_lint::levels::TopDown>>::push (\home\martin\src\rust\compiler\rustc_lint\src\levels.rs:517)
<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass>>::with_lint_attrs::<<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass> as rustc_ast::visit::Visitor>::visit_expr::{closure#0}> (\home\martin\src\rust\compiler\rustc_lint\src\early.rs:66)
<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass> as rustc_ast::visit::Visitor>::visit_expr (\home\martin\src\rust\compiler\rustc_lint\src\early.rs:119)
<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass> as rustc_ast::visit::Visitor>::visit_stmt (\home\martin\src\rust\compiler\rustc_lint\src\early.rs:148)
rustc_ast::visit::walk_block::<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass>> (\home\martin\src\rust\compiler\rustc_ast\src\visit.rs:724)
<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass> as rustc_ast::visit::Visitor>::visit_fn (\home\martin\src\rust\compiler\rustc_lint\src\early.rs:154)
rustc_ast::visit::walk_item::<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass>> (\home\martin\src\rust\compiler\rustc_ast\src\visit.rs:326)
<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass> as rustc_ast::visit::Visitor>::visit_item::{closure#0} (\home\martin\src\rust\compiler\rustc_lint\src\early.rs:89)
<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass>>::with_lint_attrs::<<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass> as rustc_ast::visit::Visitor>::visit_item::{closure#0}>::{closure#0} (\home\martin\src\rust\compiler\rustc_lint\src\early.rs:71)
stacker::maybe_grow::<(), <rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass>>::with_lint_attrs<<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass> as rustc_ast::visit::Visitor>::visit_item::{closure#0}>::{closure#0}> (\home\martin\.cargo\registry\src\index.crates.io-6f17d22bba15001f\stacker-0.1.15\src\lib.rs:55)
rustc_data_structures::stack::ensure_sufficient_stack::<(), <rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass>>::with_lint_attrs<<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass> as rustc_ast::visit::Visitor>::visit_item::{closure#0}>::{closure#0}> (\home\martin\src\rust\compiler\rustc_data_structures\src\stack.rs:17)
<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass>>::with_lint_attrs::<<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass> as rustc_ast::visit::Visitor>::visit_item::{closure#0}> (\home\martin\src\rust\compiler\rustc_lint\src\early.rs:71)
<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass> as rustc_ast::visit::Visitor>::visit_item (\home\martin\src\rust\compiler\rustc_lint\src\early.rs:87)
rustc_ast::visit::walk_crate::<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass>> (\home\martin\src\rust\compiler\rustc_ast\src\visit.rs:272)
<(&rustc_ast::ast::Crate, &[rustc_ast::ast::Attribute]) as rustc_lint::early::EarlyCheckNode>::check::<rustc_lint::BuiltinCombinedEarlyLintPass> (\home\martin\src\rust\compiler\rustc_lint\src\early.rs:356)
rustc_lint::early::check_ast_node_inner::<rustc_lint::BuiltinCombinedEarlyLintPass, (&rustc_ast::ast::Crate, &[rustc_ast::ast::Attribute])>::{closure#0} (\home\martin\src\rust\compiler\rustc_lint\src\early.rs:422)
<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass>>::with_lint_attrs::<rustc_lint::early::check_ast_node_inner<rustc_lint::BuiltinCombinedEarlyLintPass, (&rustc_ast::ast::Crate, &[rustc_ast::ast::Attribute])>::{closure#0}>::{closure#0} (\home\martin\src\rust\compiler\rustc_lint\src\early.rs:71)
stacker::maybe_grow::<(), <rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass>>::with_lint_attrs<rustc_lint::early::check_ast_node_inner<rustc_lint::BuiltinCombinedEarlyLintPass, (&rustc_ast::ast::Crate, &[rustc_ast::ast::Attribute])>::{closure#0}>::{closure#0}> (\home\martin\.cargo\registry\src\index.crates.io-6f17d22bba15001f\stacker-0.1.15\src\lib.rs:55)
rustc_data_structures::stack::ensure_sufficient_stack::<(), <rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass>>::with_lint_attrs<rustc_lint::early::check_ast_node_inner<rustc_lint::BuiltinCombinedEarlyLintPass, (&rustc_ast::ast::Crate, &[rustc_ast::ast::Attribute])>::{closure#0}>::{closure#0}> (\home\martin\src\rust\compiler\rustc_data_structures\src\stack.rs:17)
<rustc_lint::early::EarlyContextAndPass<rustc_lint::BuiltinCombinedEarlyLintPass>>::with_lint_attrs::<rustc_lint::early::check_ast_node_inner<rustc_lint::BuiltinCombinedEarlyLintPass, (&rustc_ast::ast::Crate, &[rustc_ast::ast::Attribute])>::{closure#0}> (\home\martin\src\rust\compiler\rustc_lint\src\early.rs:71)
rustc_lint::early::check_ast_node_inner::<rustc_lint::BuiltinCombinedEarlyLintPass, (&rustc_ast::ast::Crate, &[rustc_ast::ast::Attribute])> (\home\martin\src\rust\compiler\rustc_lint\src\early.rs:422)
rustc_lint::early::check_ast_node::<rustc_lint::BuiltinCombinedEarlyLintPass, (&rustc_ast::ast::Crate, &[rustc_ast::ast::Attribute])> (\home\martin\src\rust\compiler\rustc_lint\src\early.rs:405)
rustc_interface::passes::early_lint_checks (\home\martin\src\rust\compiler\rustc_interface\src\passes.rs:325)
rustc_query_impl::query_impl::early_lint_checks::dynamic_query::{closure#2}::{closure#0} (\home\martin\src\rust\compiler\rustc_query_impl\src\plumbing.rs:589)
rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::early_lint_checks::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>> (\home\martin\src\rust\compiler\rustc_query_impl\src\plumbing.rs:513)
rustc_query_impl::query_impl::early_lint_checks::dynamic_query::{closure#2} (\home\martin\src\rust\compiler\rustc_query_impl\src\plumbing.rs:585)
<rustc_query_impl::query_impl::early_lint_checks::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once (\home\martin\src\rust\library\core\src\ops\function.rs:250)
<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false> as rustc_query_system::query::config::QueryConfig<rustc_query_impl::plumbing::QueryCtxt>>::compute (\home\martin\src\rust\compiler\rustc_query_impl\src\lib.rs:119)
rustc_query_system::query::plumbing::execute_job_non_incr::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt>::{closure#0} (\home\martin\src\rust\compiler\rustc_query_system\src\query\plumbing.rs:464)
rustc_middle::ty::context::tls::enter_context::<rustc_query_system::query::plumbing::execute_job_non_incr<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt>::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>>::{closure#0} (\home\martin\src\rust\compiler\rustc_middle\src\ty\context\tls.rs:82)
<std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::try_with::<rustc_middle::ty::context::tls::enter_context<rustc_query_system::query::plumbing::execute_job_non_incr<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt>::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>>::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>> (\home\martin\src\rust\library\std\src\thread\local.rs:270)
<std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<rustc_query_system::query::plumbing::execute_job_non_incr<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt>::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>>::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>> (\home\martin\src\rust\library\std\src\thread\local.rs:246)
rustc_middle::ty::context::tls::enter_context::<rustc_query_system::query::plumbing::execute_job_non_incr<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt>::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>> (\home\martin\src\rust\compiler\rustc_middle\src\ty\context\tls.rs:79)
<rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::start_query::<rustc_middle::query::erase::Erased<[u8; 0]>, rustc_query_system::query::plumbing::execute_job_non_incr<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt>::{closure#0}>::{closure#0} (\home\martin\src\rust\compiler\rustc_query_impl\src\plumbing.rs:151)
rustc_middle::ty::context::tls::with_related_context::<<rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::start_query<rustc_middle::query::erase::Erased<[u8; 0]>, rustc_query_system::query::plumbing::execute_job_non_incr<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt>::{closure#0}>::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>>::{closure#0} (\home\martin\src\rust\compiler\rustc_middle\src\ty\context\tls.rs:133)
rustc_middle::ty::context::tls::with_context::<rustc_middle::ty::context::tls::with_related_context<<rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::start_query<rustc_middle::query::erase::Erased<[u8; 0]>, rustc_query_system::query::plumbing::execute_job_non_incr<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt>::{closure#0}>::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>>::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>>::{closure#0} (\home\martin\src\rust\compiler\rustc_middle\src\ty\context\tls.rs:111)

The first err.emit() backtrace looks exactly the same, except it does not have the visit_expr() stack frame.

//~| WARNING unknown lint: `non_exhaustive_omitted_patterns`
//~| WARNING unknown lint: `non_exhaustive_omitted_patterns`
//~| WARNING unknown lint: `non_exhaustive_omitted_patterns`
match Foo::A {
//~^ ERROR non-exhaustive patterns: `Foo::C` not covered
Foo::A => {}
Expand All @@ -31,9 +24,6 @@ fn main() {
#[warn(non_exhaustive_omitted_patterns)]
//~^ WARNING unknown lint: `non_exhaustive_omitted_patterns`
//~| WARNING unknown lint: `non_exhaustive_omitted_patterns`
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Here too?

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(See above)

//~| WARNING unknown lint: `non_exhaustive_omitted_patterns`
//~| WARNING unknown lint: `non_exhaustive_omitted_patterns`
//~| WARNING unknown lint: `non_exhaustive_omitted_patterns`
match Foo::A {
Foo::A => {}
Foo::B => {}
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