X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=compiler%2Frustc_expand%2Fsrc%2Fbase.rs;h=9fe5d588b1f5da117c54516eeb33c6110577ab89;hb=3aace9a641b80c9929a2218fe4d2923864d8ff50;hp=bdcd53349492ccb98945ee4a41a8fe5c39e8adda;hpb=54b629285512582f9405ecfad05cb9c6acb0ecdd;p=rust.git

diff --git a/compiler/rustc_expand/src/base.rs b/compiler/rustc_expand/src/base.rs
index bdcd5334949..9fe5d588b1f 100644
--- a/compiler/rustc_expand/src/base.rs
+++ b/compiler/rustc_expand/src/base.rs
@@ -242,8 +242,8 @@ pub enum ExpandResult<T, U> {
     Retry(U),
 }
 
-// `meta_item` is the attribute, and `item` is the item being modified.
 pub trait MultiItemModifier {
+    /// `meta_item` is the attribute, and `item` is the item being modified.
     fn expand(
         &self,
         ecx: &mut ExtCtxt<'_>,
@@ -676,8 +676,13 @@ pub enum SyntaxExtensionKind {
 
     /// A token-based derive macro.
     Derive(
-        /// An expander with signature TokenStream -> TokenStream (not yet).
+        /// An expander with signature TokenStream -> TokenStream.
         /// The produced TokenSteam is appended to the input TokenSteam.
+        ///
+        /// FIXME: The text above describes how this should work. Currently it
+        /// is handled identically to `LegacyDerive`. It should be migrated to
+        /// a token-based representation like `Bang` and `Attr`, instead of
+        /// using `MultiItemModifier`.
         Box<dyn MultiItemModifier + sync::Sync + sync::Send>,
     ),