diff options
| -rw-r--r-- | compiler/rustc_errors/src/lib.rs | 1 | ||||
| -rw-r--r-- | compiler/rustc_lint/src/expect.rs | 9 | ||||
| -rw-r--r-- | compiler/rustc_lint/src/levels.rs | 34 | ||||
| -rw-r--r-- | compiler/rustc_middle/src/lint.rs | 12 | ||||
| -rw-r--r-- | src/test/ui/lint/rfc-2383-lint-reason/expect_unfulfilled_expectation.rs | 39 | ||||
| -rw-r--r-- | src/test/ui/lint/rfc-2383-lint-reason/expect_unfulfilled_expectation.stderr | 38 |
6 files changed, 119 insertions, 14 deletions
diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs index cba06448c4a..5ba1fe9b478 100644 --- a/compiler/rustc_errors/src/lib.rs +++ b/compiler/rustc_errors/src/lib.rs @@ -970,6 +970,7 @@ impl Handler { /// This methods steals all [`LintExpectationId`]s that are stored inside /// [`HandlerInner`] and indicate that the linked expectation has been fulfilled. + #[must_use] pub fn steal_fulfilled_expectation_ids(&self) -> FxHashSet<LintExpectationId> { assert!( self.inner.borrow().unstable_expect_diagnostics.is_empty(), diff --git a/compiler/rustc_lint/src/expect.rs b/compiler/rustc_lint/src/expect.rs index e6c9d0b0ab0..74fef0be9e9 100644 --- a/compiler/rustc_lint/src/expect.rs +++ b/compiler/rustc_lint/src/expect.rs @@ -30,10 +30,6 @@ fn emit_unfulfilled_expectation_lint( hir_id: HirId, expectation: &LintExpectation, ) { - // FIXME: The current implementation doesn't cover cases where the - // `unfulfilled_lint_expectations` is actually expected by another lint - // expectation. This can be added here by checking the lint level and - // retrieving the `LintExpectationId` if it was expected. tcx.struct_span_lint_hir( builtin::UNFULFILLED_LINT_EXPECTATIONS, hir_id, @@ -43,6 +39,11 @@ fn emit_unfulfilled_expectation_lint( if let Some(rationale) = expectation.reason { diag.note(&rationale.as_str()); } + + if expectation.is_unfulfilled_lint_expectations { + diag.note("the `unfulfilled_lint_expectations` lint can't be expected and will always produce this message"); + } + diag.emit(); }, ); diff --git a/compiler/rustc_lint/src/levels.rs b/compiler/rustc_lint/src/levels.rs index f46f74fa45f..468aacc9bca 100644 --- a/compiler/rustc_lint/src/levels.rs +++ b/compiler/rustc_lint/src/levels.rs @@ -14,7 +14,7 @@ use rustc_middle::lint::{ use rustc_middle::ty::query::Providers; use rustc_middle::ty::{RegisteredTools, TyCtxt}; use rustc_session::lint::{ - builtin::{self, FORBIDDEN_LINT_GROUPS}, + builtin::{self, FORBIDDEN_LINT_GROUPS, UNFULFILLED_LINT_EXPECTATIONS}, Level, Lint, LintExpectationId, LintId, }; use rustc_session::parse::feature_err; @@ -212,6 +212,14 @@ impl<'s> LintLevelsBuilder<'s> { } } } + + // The lint `unfulfilled_lint_expectations` can't be expected, as it would suppress itself. + // Handling expectations of this lint would add additional complexity with little to no + // benefit. The expect level for this lint will therefore be ignored. + if let Level::Expect(_) = level && id == LintId::of(UNFULFILLED_LINT_EXPECTATIONS) { + return; + } + if let Level::ForceWarn = old_level { specs.insert(id, (old_level, old_src)); } else { @@ -344,6 +352,20 @@ impl<'s> LintLevelsBuilder<'s> { self.store.check_lint_name(&name, tool_name, self.registered_tools); match &lint_result { CheckLintNameResult::Ok(ids) => { + // This checks for instances where the user writes `#[expect(unfulfilled_lint_expectations)]` + // in that case we want to avoid overriding the lint level but instead add an expectation that + // can't be fulfilled. The lint message will include an explanation, that the + // `unfulfilled_lint_expectations` lint can't be expected. + if let Level::Expect(expect_id) = level { + let is_unfulfilled_lint_expectations = match ids { + [lint] => *lint == LintId::of(UNFULFILLED_LINT_EXPECTATIONS), + _ => false, + }; + self.lint_expectations.push(( + expect_id, + LintExpectation::new(reason, sp, is_unfulfilled_lint_expectations), + )); + } let src = LintLevelSource::Node( meta_item.path.segments.last().expect("empty lint name").ident.name, sp, @@ -353,10 +375,6 @@ impl<'s> LintLevelsBuilder<'s> { self.check_gated_lint(id, attr.span); self.insert_spec(&mut specs, id, (level, src)); } - if let Level::Expect(expect_id) = level { - self.lint_expectations - .push((expect_id, LintExpectation::new(reason, sp))); - } } CheckLintNameResult::Tool(result) => { @@ -374,7 +392,7 @@ impl<'s> LintLevelsBuilder<'s> { } if let Level::Expect(expect_id) = level { self.lint_expectations - .push((expect_id, LintExpectation::new(reason, sp))); + .push((expect_id, LintExpectation::new(reason, sp, false))); } } Err((Some(ids), ref new_lint_name)) => { @@ -414,7 +432,7 @@ impl<'s> LintLevelsBuilder<'s> { } if let Level::Expect(expect_id) = level { self.lint_expectations - .push((expect_id, LintExpectation::new(reason, sp))); + .push((expect_id, LintExpectation::new(reason, sp, false))); } } Err((None, _)) => { @@ -511,7 +529,7 @@ impl<'s> LintLevelsBuilder<'s> { } if let Level::Expect(expect_id) = level { self.lint_expectations - .push((expect_id, LintExpectation::new(reason, sp))); + .push((expect_id, LintExpectation::new(reason, sp, false))); } } else { panic!("renamed lint does not exist: {}", new_name); diff --git a/compiler/rustc_middle/src/lint.rs b/compiler/rustc_middle/src/lint.rs index 894947fa70d..1b301629b9c 100644 --- a/compiler/rustc_middle/src/lint.rs +++ b/compiler/rustc_middle/src/lint.rs @@ -204,11 +204,19 @@ pub struct LintExpectation { pub reason: Option<Symbol>, /// The [`Span`] of the attribute that this expectation originated from. pub emission_span: Span, + /// Lint messages for the `unfulfilled_lint_expectations` lint will be + /// adjusted to include an additional note. Therefore, we have to track if + /// the expectation is for the lint. + pub is_unfulfilled_lint_expectations: bool, } impl LintExpectation { - pub fn new(reason: Option<Symbol>, attr_span: Span) -> Self { - Self { reason, emission_span: attr_span } + pub fn new( + reason: Option<Symbol>, + emission_span: Span, + is_unfulfilled_lint_expectations: bool, + ) -> Self { + Self { reason, emission_span, is_unfulfilled_lint_expectations } } } diff --git a/src/test/ui/lint/rfc-2383-lint-reason/expect_unfulfilled_expectation.rs b/src/test/ui/lint/rfc-2383-lint-reason/expect_unfulfilled_expectation.rs new file mode 100644 index 00000000000..d38e6553386 --- /dev/null +++ b/src/test/ui/lint/rfc-2383-lint-reason/expect_unfulfilled_expectation.rs @@ -0,0 +1,39 @@ +// check-pass +// ignore-tidy-linelength + +#![feature(lint_reasons)] +#![warn(unused_mut)] + +#![expect(unfulfilled_lint_expectations, reason = "idk why you would expect this")] +//~^ WARNING this lint expectation is unfulfilled +//~| NOTE `#[warn(unfulfilled_lint_expectations)]` on by default +//~| NOTE idk why you would expect this +//~| NOTE the `unfulfilled_lint_expectations` lint can't be expected and will always produce this message + +#[expect(unfulfilled_lint_expectations, reason = "a local: idk why you would expect this")] +//~^ WARNING this lint expectation is unfulfilled +//~| NOTE a local: idk why you would expect this +//~| NOTE the `unfulfilled_lint_expectations` lint can't be expected and will always produce this message +pub fn normal_test_fn() { + #[expect(unused_mut, reason = "this expectation will create a diagnostic with the default lint level")] + //~^ WARNING this lint expectation is unfulfilled + //~| NOTE this expectation will create a diagnostic with the default lint level + let mut v = vec![1, 1, 2, 3, 5]; + v.sort(); + + // Check that lint lists including `unfulfilled_lint_expectations` are also handled correctly + #[expect(unused, unfulfilled_lint_expectations, reason = "the expectation for `unused` should be fulfilled")] + //~^ WARNING this lint expectation is unfulfilled + //~| NOTE the expectation for `unused` should be fulfilled + //~| NOTE the `unfulfilled_lint_expectations` lint can't be expected and will always produce this message + let value = "I'm unused"; +} + +#[expect(warnings, reason = "this suppresses all warnings and also suppresses itself. No warning will be issued")] +pub fn expect_warnings() { + // This lint trigger will be suppressed + #[warn(unused_mut)] + let mut v = vec![1, 1, 2, 3, 5]; +} + +fn main() {} diff --git a/src/test/ui/lint/rfc-2383-lint-reason/expect_unfulfilled_expectation.stderr b/src/test/ui/lint/rfc-2383-lint-reason/expect_unfulfilled_expectation.stderr new file mode 100644 index 00000000000..9bfee79b03d --- /dev/null +++ b/src/test/ui/lint/rfc-2383-lint-reason/expect_unfulfilled_expectation.stderr @@ -0,0 +1,38 @@ +warning: this lint expectation is unfulfilled + --> $DIR/expect_unfulfilled_expectation.rs:7:11 + | +LL | #![expect(unfulfilled_lint_expectations, reason = "idk why you would expect this")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = note: `#[warn(unfulfilled_lint_expectations)]` on by default + = note: idk why you would expect this + = note: the `unfulfilled_lint_expectations` lint can't be expected and will always produce this message + +warning: this lint expectation is unfulfilled + --> $DIR/expect_unfulfilled_expectation.rs:13:10 + | +LL | #[expect(unfulfilled_lint_expectations, reason = "a local: idk why you would expect this")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = note: a local: idk why you would expect this + = note: the `unfulfilled_lint_expectations` lint can't be expected and will always produce this message + +warning: this lint expectation is unfulfilled + --> $DIR/expect_unfulfilled_expectation.rs:18:14 + | +LL | #[expect(unused_mut, reason = "this expectation will create a diagnostic with the default lint level")] + | ^^^^^^^^^^ + | + = note: this expectation will create a diagnostic with the default lint level + +warning: this lint expectation is unfulfilled + --> $DIR/expect_unfulfilled_expectation.rs:25:22 + | +LL | #[expect(unused, unfulfilled_lint_expectations, reason = "the expectation for `unused` should be fulfilled")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = note: the expectation for `unused` should be fulfilled + = note: the `unfulfilled_lint_expectations` lint can't be expected and will always produce this message + +warning: 4 warnings emitted + |