From 2d38ea2ef41c143b0df81cca822f5660085e2329 Mon Sep 17 00:00:00 2001
From: Martin Nordholts <martin.nordholts@codetale.se>
Date: Fri, 2 Jan 2026 12:52:40 +0100
Subject: [PATCH] compiler: Make Externally Implementable Items (eii) in std
 build

---
 compiler/rustc_builtin_macros/src/eii.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/compiler/rustc_builtin_macros/src/eii.rs b/compiler/rustc_builtin_macros/src/eii.rs
index 9049639925ddb..7668745fa0662 100644
--- a/compiler/rustc_builtin_macros/src/eii.rs
+++ b/compiler/rustc_builtin_macros/src/eii.rs
@@ -134,6 +134,7 @@ fn eii_(
         foreign_item_name,
         impl_unsafe,
         decl_span,
+        &attrs_from_decl,
     )));
 
     return_items.into_iter().map(wrap_item).collect()
@@ -353,9 +354,22 @@ fn generate_attribute_macro_to_implement(
     foreign_item_name: Ident,
     impl_unsafe: bool,
     decl_span: Span,
+    attrs_from_decl: &[Attribute],
 ) -> ast::Item {
     let mut macro_attrs = ThinVec::new();
 
+    // To avoid e.g. `error: attribute macro has missing stability attribute`
+    // errors for eii's in std.
+    macro_attrs.extend_from_slice(attrs_from_decl);
+
+    // Needed to avoid lots of unrelated "missing stability attribute" errors on
+    // unrelated items.
+    macro_attrs.push(ecx.attr_name_value_str(
+        sym::rustc_macro_transparency,
+        sym::transparent,
+        span,
+    ));
+
     // #[builtin_macro(eii_shared_macro)]
     macro_attrs.push(ecx.attr_nested_word(sym::rustc_builtin_macro, sym::eii_shared_macro, span));