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-rw-r--r--compiler/rustc_middle/src/arena.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/rustc_middle/src/arena.rs b/compiler/rustc_middle/src/arena.rs
index 2dcb0de92b7..a0f45974089 100644
--- a/compiler/rustc_middle/src/arena.rs
+++ b/compiler/rustc_middle/src/arena.rs
@@ -91,6 +91,8 @@ macro_rules! arena_types {
             [] autodiff_item: rustc_ast::expand::autodiff_attrs::AutoDiffItem,
             [] ordered_name_set: rustc_data_structures::fx::FxIndexSet<rustc_span::Symbol>,
             [] valtree: rustc_middle::ty::ValTreeKind<'tcx>,
+            [] stable_order_of_exportable_impls:
+                rustc_data_structures::fx::FxIndexMap<rustc_hir::def_id::DefId, usize>,
 
             // Note that this deliberately duplicates items in the `rustc_hir::arena`,
             // since we need to allocate this type on both the `rustc_hir` arena