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use crate::builtin;
use rustc_errors::fluent;
use rustc_hir::HirId;
use rustc_middle::ty::query::Providers;
use rustc_middle::{lint::LintExpectation, ty::TyCtxt};
use rustc_session::lint::LintExpectationId;
use rustc_span::symbol::sym;
use rustc_span::Symbol;
pub(crate) fn provide(providers: &mut Providers) {
*providers = Providers { check_expectations, ..*providers };
}
fn check_expectations(tcx: TyCtxt<'_>, tool_filter: Option<Symbol>) {
if !tcx.sess.features_untracked().enabled(sym::lint_reasons) {
return;
}
let fulfilled_expectations = tcx.sess.diagnostic().steal_fulfilled_expectation_ids();
let lint_expectations = &tcx.lint_levels(()).lint_expectations;
for (id, expectation) in lint_expectations {
// This check will always be true, since `lint_expectations` only
// holds stable ids
if let LintExpectationId::Stable { hir_id, .. } = id {
if !fulfilled_expectations.contains(&id)
&& tool_filter.map_or(true, |filter| expectation.lint_tool == Some(filter))
{
emit_unfulfilled_expectation_lint(tcx, *hir_id, expectation);
}
} else {
unreachable!("at this stage all `LintExpectationId`s are stable");
}
}
}
fn emit_unfulfilled_expectation_lint(
tcx: TyCtxt<'_>,
hir_id: HirId,
expectation: &LintExpectation,
) {
tcx.struct_span_lint_hir(
builtin::UNFULFILLED_LINT_EXPECTATIONS,
hir_id,
expectation.emission_span,
|diag| {
let mut diag = diag.build(fluent::lint::expectation);
if let Some(rationale) = expectation.reason {
diag.note(rationale.as_str());
}
if expectation.is_unfulfilled_lint_expectations {
diag.note(fluent::lint::note);
}
diag.emit();
},
);
}
|
