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-rw-r--r--src/rustdoc-json-types/lib.rs9
1 files changed, 7 insertions, 2 deletions
diff --git a/src/rustdoc-json-types/lib.rs b/src/rustdoc-json-types/lib.rs
index 40f89009a43..658d3791d25 100644
--- a/src/rustdoc-json-types/lib.rs
+++ b/src/rustdoc-json-types/lib.rs
@@ -37,8 +37,8 @@ pub type FxHashMap<K, V> = HashMap<K, V>; // re-export for use in src/librustdoc
 // will instead cause conflicts. See #94591 for more. (This paragraph and the "Latest feature" line
 // are deliberately not in a doc comment, because they need not be in public docs.)
 //
-// Latest feature: Add Attribute::MacroUse
-pub const FORMAT_VERSION: u32 = 55;
+// Latest feature: Add `ItemKind::Attribute`.
+pub const FORMAT_VERSION: u32 = 56;
 
 /// The root of the emitted JSON blob.
 ///
@@ -552,6 +552,11 @@ pub enum ItemKind {
     /// [`Item`]s of this kind only come from the come library and exist solely
     /// to carry documentation for the respective keywords.
     Keyword,
+    /// An attribute declaration.
+    ///
+    /// [`Item`]s of this kind only come from the core library and exist solely
+    /// to carry documentation for the respective builtin attributes.
+    Attribute,
 }
 
 /// Specific fields of an item.