diff --git a/compiler/rustc_macros/src/diagnostics/diagnostic.rs b/compiler/rustc_macros/src/diagnostics/diagnostic.rs
index 9e498fb5af2..ebae1d7b8ad 100644
--- a/compiler/rustc_macros/src/diagnostics/diagnostic.rs
+++ b/compiler/rustc_macros/src/diagnostics/diagnostic.rs
@@ -17,11 +17,11 @@ pub(crate) struct DiagnosticDerive<'a> {
 }
 
 impl<'a> DiagnosticDerive<'a> {
-    pub(crate) fn new(diag: syn::Ident, handler: syn::Ident, structure: Structure<'a>) -> Self {
+    pub(crate) fn new(diag: syn::Ident, dcx: syn::Ident, structure: Structure<'a>) -> Self {
         Self {
             builder: DiagnosticDeriveBuilder {
                 diag,
-                kind: DiagnosticDeriveKind::Diagnostic { handler },
+                kind: DiagnosticDeriveKind::Diagnostic { dcx },
             },
             structure,
         }
@@ -36,7 +36,7 @@ impl<'a> DiagnosticDerive<'a> {
             let body = builder.body(variant);
 
             let diag = &builder.parent.diag;
-            let DiagnosticDeriveKind::Diagnostic { handler } = &builder.parent.kind else {
+            let DiagnosticDeriveKind::Diagnostic { dcx } = &builder.parent.kind else {
                 unreachable!()
             };
             let init = match builder.slug.value_ref() {
@@ -62,7 +62,7 @@ impl<'a> DiagnosticDerive<'a> {
                 Some(slug) => {
                     slugs.borrow_mut().push(slug.clone());
                     quote! {
-                        let mut #diag = #handler.struct_diagnostic(crate::fluent_generated::#slug);
+                        let mut #diag = #dcx.struct_diagnostic(crate::fluent_generated::#slug);
                     }
                 }
             };
@@ -77,7 +77,7 @@ impl<'a> DiagnosticDerive<'a> {
             }
         });
 
-        let DiagnosticDeriveKind::Diagnostic { handler } = &builder.kind else { unreachable!() };
+        let DiagnosticDeriveKind::Diagnostic { dcx } = &builder.kind else { unreachable!() };
 
         let mut imp = structure.gen_impl(quote! {
             gen impl<'__diagnostic_handler_sess, G>
@@ -89,7 +89,7 @@ impl<'a> DiagnosticDerive<'a> {
                 #[track_caller]
                 fn into_diagnostic(
                     self,
-                    #handler: &'__diagnostic_handler_sess rustc_errors::DiagCtxt
+                    #dcx: &'__diagnostic_handler_sess rustc_errors::DiagCtxt
                 ) -> rustc_errors::DiagnosticBuilder<'__diagnostic_handler_sess, G> {
                     use rustc_errors::IntoDiagnosticArg;
                     #implementation
diff --git a/compiler/rustc_macros/src/diagnostics/diagnostic_builder.rs b/compiler/rustc_macros/src/diagnostics/diagnostic_builder.rs
index 2755a161d91..9676e04fb75 100644
--- a/compiler/rustc_macros/src/diagnostics/diagnostic_builder.rs
+++ b/compiler/rustc_macros/src/diagnostics/diagnostic_builder.rs
@@ -19,7 +19,7 @@ use super::utils::SubdiagnosticVariant;
 /// What kind of diagnostic is being derived - a fatal/error/warning or a lint?
 #[derive(Clone, PartialEq, Eq)]
 pub(crate) enum DiagnosticDeriveKind {
-    Diagnostic { handler: syn::Ident },
+    Diagnostic { dcx: syn::Ident },
     LintDiagnostic,
 }
 
@@ -348,11 +348,11 @@ impl<'a> DiagnosticDeriveVariantBuilder<'a> {
             }
             (Meta::Path(_), "subdiagnostic") => {
                 if FieldInnerTy::from_type(&info.binding.ast().ty).will_iterate() {
-                    let DiagnosticDeriveKind::Diagnostic { handler } = &self.parent.kind else {
+                    let DiagnosticDeriveKind::Diagnostic { dcx } = &self.parent.kind else {
                         // No eager translation for lints.
                         return Ok(quote! { #diag.subdiagnostic(#binding); });
                     };
-                    return Ok(quote! { #diag.eager_subdiagnostic(#handler, #binding); });
+                    return Ok(quote! { #diag.eager_subdiagnostic(#dcx, #binding); });
                 } else {
                     return Ok(quote! { #diag.subdiagnostic(#binding); });
                 }
@@ -377,7 +377,7 @@ impl<'a> DiagnosticDeriveVariantBuilder<'a> {
                 }
 
                 let handler = match &self.parent.kind {
-                    DiagnosticDeriveKind::Diagnostic { handler } => handler,
+                    DiagnosticDeriveKind::Diagnostic { dcx } => dcx,
                     DiagnosticDeriveKind::LintDiagnostic => {
                         throw_invalid_attr!(attr, |diag| {
                             diag.help("eager subdiagnostics are not supported on lints")