1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_mir/src/transform/deduplicate_blocks.rs b/compiler/rustc_mir/src/transform/deduplicate_blocks.rs
index c4b51099f53..e102512e1f3 100644
--- a/compiler/rustc_mir/src/transform/deduplicate_blocks.rs
+++ b/compiler/rustc_mir/src/transform/deduplicate_blocks.rs
@@ -86,7 +86,7 @@ fn find_duplicates<'a, 'tcx>(body: &'a Body<'tcx>) -> FxHashMap<BasicBlock, Basi
                 // The basic block was already in the hashmap, which means we have a duplicate
                 let value = *occupied.get();
                 debug!("Inserting {:?} -> {:?}", bb, value);
-                duplicates.insert(bb, value).expect_none("key was already inserted");
+                duplicates.try_insert(bb, value).expect("key was already inserted");
             }
             Entry::Vacant(vacant) => {
                 vacant.insert(bb);