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Handle #[expect(unfulfilled_lint_expectations)] with a lint message

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This commit is contained in:
xFrednet 2022-03-06 14:18:28 +01:00
parent 165b5583e5
commit d39d60971b
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GPG key ID: FCDCBF29AF64D601
6 changed files with 119 additions and 14 deletions
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9
compiler/rustc_lint/src/expect.rs
View file

@ -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();
},
);

34
compiler/rustc_lint/src/levels.rs
View file

@ -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);