diff --git a/src/librustc_codegen_llvm/lib.rs b/src/librustc_codegen_llvm/lib.rs
index 52797e64f7df9..6c44c6b8464e0 100644
--- a/src/librustc_codegen_llvm/lib.rs
+++ b/src/librustc_codegen_llvm/lib.rs
@@ -258,10 +258,6 @@ impl CodegenBackend for LlvmCodegenBackend {
         llvm_util::print_version();
     }
 
-    fn diagnostics(&self) -> &[(&'static str, &'static str)] {
-        &error_codes::DIAGNOSTICS
-    }
-
     fn target_features(&self, sess: &Session) -> Vec<Symbol> {
         target_features(sess)
     }
diff --git a/src/librustc_codegen_utils/codegen_backend.rs b/src/librustc_codegen_utils/codegen_backend.rs
index 2e3af8431eed0..1077c1f42637e 100644
--- a/src/librustc_codegen_utils/codegen_backend.rs
+++ b/src/librustc_codegen_utils/codegen_backend.rs
@@ -25,7 +25,6 @@ pub trait CodegenBackend {
     fn target_features(&self, _sess: &Session) -> Vec<Symbol> { vec![] }
     fn print_passes(&self) {}
     fn print_version(&self) {}
-    fn diagnostics(&self) -> &[(&'static str, &'static str)] { &[] }
 
     fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync>;
     fn provide(&self, _providers: &mut Providers<'_>);