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3 changes: 3 additions & 0 deletions compiler/rustc_error_messages/locales/en-US/passes.ftl
Original file line number Diff line number Diff line change
Expand Up @@ -268,3 +268,6 @@ passes_link_ordinal = attribute should be applied to a foreign function or stati
passes_collapse_debuginfo = `collapse_debuginfo` attribute should be applied to macro definitions
.label = not a macro definition
passes_deprecated_annotation_has_no_effect = this `#[deprecated]` annotation has no effect
.suggestion = remove the unnecessary deprecation attribute
7 changes: 7 additions & 0 deletions compiler/rustc_passes/src/errors.rs
Original file line number Diff line number Diff line change
Expand Up @@ -658,3 +658,10 @@ pub struct CollapseDebuginfo {
#[label]
pub defn_span: Span,
}

#[derive(LintDiagnostic)]
#[diag(passes::deprecated_annotation_has_no_effect)]
pub struct DeprecatedAnnotationHasNoEffect {
#[suggestion(applicability = "machine-applicable", code = "")]
pub span: Span,
}
17 changes: 7 additions & 10 deletions compiler/rustc_passes/src/stability.rs
Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
//! A pass that annotates every item and method with its stability level,
//! propagating default levels lexically from parent to children ast nodes.

use crate::errors;
use rustc_attr::{
self as attr, rust_version_symbol, ConstStability, Stability, StabilityLevel, Unstable,
UnstableReason, VERSION_PLACEHOLDER,
Expand Down Expand Up @@ -122,16 +123,12 @@ impl<'a, 'tcx> Annotator<'a, 'tcx> {

if kind == AnnotationKind::Prohibited || kind == AnnotationKind::DeprecationProhibited {
let hir_id = self.tcx.hir().local_def_id_to_hir_id(def_id);
self.tcx.struct_span_lint_hir(USELESS_DEPRECATED, hir_id, *span, |lint| {
lint.build("this `#[deprecated]` annotation has no effect")
.span_suggestion_short(
*span,
"remove the unnecessary deprecation attribute",
"",
rustc_errors::Applicability::MachineApplicable,
)
.emit();
});
self.tcx.emit_spanned_lint(
USELESS_DEPRECATED,
hir_id,
*span,
errors::DeprecatedAnnotationHasNoEffect { span: *span },
);
}

// `Deprecation` is just two pointers, no need to intern it
Expand Down