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-rw-r--r--compiler/rustc_ast/src/ast.rs1
1 files changed, 0 insertions, 1 deletions
diff --git a/compiler/rustc_ast/src/ast.rs b/compiler/rustc_ast/src/ast.rs
index c85ff6f5c44..e311352c93d 100644
--- a/compiler/rustc_ast/src/ast.rs
+++ b/compiler/rustc_ast/src/ast.rs
@@ -2574,7 +2574,6 @@ pub enum AttrStyle {
 }
 
 rustc_index::newtype_index! {
-    #[custom_encodable]
     #[debug_format = "AttrId({})"]
     pub struct AttrId {}
 }