add error message for unused duplicate

Author: jdonszelmann

compiler/rustc_attr_parsing/messages.ftl

@@ -135,9 +135,7 @@ attr_parsing_unused_duplicate =
     unused attribute
     .suggestion = remove this attribute
     .note = attribute also specified here
-    .warn = {-attr_parsing_previously_accepted}
-
-
+    .warn = {-passes_previously_accepted}
 attr_parsing_unused_multiple =
     multiple `{$name}` attributes
     .suggestion = remove this attribute

compiler/rustc_attr_parsing/src/session_diagnostics.rs

@@ -452,7 +452,7 @@ pub(crate) struct UnusedMultiple {
 }
 
 #[derive(LintDiagnostic)]
-#[diag(attr_parsing_unused_multiple)]
+#[diag(attr_parsing_unused_duplicate)]
 pub(crate) struct UnusedDuplicate {
     #[suggestion(code = "", applicability = "machine-applicable")]
     pub this: Span,

compiler/rustc_errors/src/lib.rs

@@ -62,8 +62,9 @@ pub use rustc_error_messages::{
     SubdiagMessage, fallback_fluent_bundle, fluent_bundle,
 };
 use rustc_hashes::Hash128;
-use rustc_lint_defs::LintExpectationId;
+use rustc_hir::HirId;
 pub use rustc_lint_defs::{Applicability, listify, pluralize};
+use rustc_lint_defs::{Lint, LintExpectationId};
 use rustc_macros::{Decodable, Encodable};
 pub use rustc_span::ErrorGuaranteed;
 pub use rustc_span::fatal_error::{FatalError, FatalErrorMarker};