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-rw-r--r--compiler/rustc_trait_selection/src/traits/auto_trait.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_trait_selection/src/traits/auto_trait.rs b/compiler/rustc_trait_selection/src/traits/auto_trait.rs
index c4344758574..0b9fb7b6fbc 100644
--- a/compiler/rustc_trait_selection/src/traits/auto_trait.rs
+++ b/compiler/rustc_trait_selection/src/traits/auto_trait.rs
@@ -513,6 +513,7 @@ impl<'tcx> AutoTraitFinder<'tcx> {
         }
 
         while !vid_map.is_empty() {
+            #[allow(rustc::potential_query_instability)]
             let target = *vid_map.keys().next().expect("Keys somehow empty");
             let deps = vid_map.remove(&target).expect("Entry somehow missing");