[omochi@omochi-iMac-PC43 Release]$ nm Sandbox_20200204195103 | grep NativeSet 0000000100001b70 t _$ss10_NativeSetV13copyAndResize8capacityySi_tFSi_Tg5 0000000100001970 t _$ss10_NativeSetV4copyyyFSi_Tg5 0000000100001e50 t _$ss10_NativeSetV6resize8capacityySi_tFSi_Tg5 0000000100001870 t _$ss10_NativeSetV9insertNew_2at8isUniqueyxn_s10_HashTableV6BucketVSbtFSi_Tg5 [omochi@omochi-iMac-PC43 Release]$ nm Sandbox_20200204195103 | grep NativeSet | swift demangle 0000000100001b70 t generic specialization <Swift.Int> of Swift._NativeSet.copyAndResize(capacity: Swift.Int) -> () 0000000100001970 t generic specialization <Swift.Int> of Swift._NativeSet.copy() -> () 0000000100001e50 t generic specialization <Swift.Int> of Swift._NativeSet.resize(capacity: Swift.Int) -> () 0000000100001870 t generic specialization <Swift.Int> of Swift._NativeSet.insertNew(_: __owned A, at: Swift._HashTable.Bucket, isUnique: Swift.Bool) -> ()