Change only_local to a enum type.

compiler/rustc_feature/src/lib.rs

@@ -124,7 +124,7 @@ pub fn find_feature_issue(feature: Symbol, issue: GateIssue) -> Option<NonZero<u
 pub use accepted::ACCEPTED_FEATURES;
 pub use builtin_attrs::AttributeDuplicates;
 pub use builtin_attrs::{
-    deprecated_attributes, find_gated_cfg, is_builtin_attr_name, is_builtin_only_local,
+    deprecated_attributes, encode_cross_crate, find_gated_cfg, is_builtin_attr_name,
     is_valid_for_get_attr, AttributeGate, AttributeTemplate, AttributeType, BuiltinAttribute,
     GatedCfg, BUILTIN_ATTRIBUTES, BUILTIN_ATTRIBUTE_MAP,
 };

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -817,8 +817,8 @@ struct AnalyzeAttrState {
 #[inline]
 fn analyze_attr(attr: &Attribute, state: &mut AnalyzeAttrState) -> bool {
     let mut should_encode = false;
-    if rustc_feature::is_builtin_only_local(attr.name_or_empty()) {
-        // Attributes marked local-only don't need to be encoded for downstream crates.
+    if !rustc_feature::encode_cross_crate(attr.name_or_empty()) {
+        // Attributes not marked encode-cross-crate don't need to be encoded for downstream crates.
     } else if attr.doc_str().is_some() {
         // We keep all doc comments reachable to rustdoc because they might be "imported" into
         // downstream crates if they use `#[doc(inline)]` to copy an item's documentation into

compiler/rustc_middle/src/ty/mod.rs

@@ -1752,9 +1752,8 @@ impl<'tcx> TyCtxt<'tcx> {
         let filter_fn = move |a: &&ast::Attribute| a.has_name(attr);
         if let Some(did) = did.as_local() {
             self.hir().attrs(self.local_def_id_to_hir_id(did)).iter().filter(filter_fn)
-        } else if cfg!(debug_assertions) && rustc_feature::is_builtin_only_local(attr) {
-            bug!("tried to access the `only_local` attribute `{}` from an extern crate", attr);
         } else {
+            debug_assert!(rustc_feature::encode_cross_crate(attr));
             self.item_attrs(did).iter().filter(filter_fn)
         }
     }
@@ -1786,12 +1785,7 @@ impl<'tcx> TyCtxt<'tcx> {
 
     /// Determines whether an item is annotated with an attribute.
     pub fn has_attr(self, did: impl Into<DefId>, attr: Symbol) -> bool {
-        let did: DefId = did.into();
-        if cfg!(debug_assertions) && !did.is_local() && rustc_feature::is_builtin_only_local(attr) {
-            bug!("tried to access the `only_local` attribute `{}` from an extern crate", attr);
-        } else {
-            self.get_attrs(did, attr).next().is_some()
-        }
+        self.get_attrs(did, attr).next().is_some()
     }
 
     /// Returns `true` if this is an `auto trait`.