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-rw-r--r--compiler/rustc_middle/src/arena.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_middle/src/arena.rs b/compiler/rustc_middle/src/arena.rs
index 750531b638e..eaccd8c360e 100644
--- a/compiler/rustc_middle/src/arena.rs
+++ b/compiler/rustc_middle/src/arena.rs
@@ -87,6 +87,7 @@ macro_rules! arena_types {
             [] codegen_unit: rustc_middle::mir::mono::CodegenUnit<'tcx>,
             [decode] attribute: rustc_hir::Attribute,
             [] name_set: rustc_data_structures::unord::UnordSet<rustc_span::Symbol>,
+            [] autodiff_item: rustc_ast::expand::autodiff_attrs::AutoDiffItem,
             [] ordered_name_set: rustc_data_structures::fx::FxIndexSet<rustc_span::Symbol>,
             [] pats: rustc_middle::ty::PatternKind<'tcx>,