From 418cbea4eea6e5e66a134d370c6e5cee080cb8d1 Mon Sep 17 00:00:00 2001
From: Hyunmin Shin <shm1193@gmail.com>
Date: Wed, 10 Aug 2022 21:42:10 +0900
Subject: [PATCH] Add expect message

---
 vm/src/builtins/union.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vm/src/builtins/union.rs b/vm/src/builtins/union.rs
index 970144d4a..1c43eab7b 100644
--- a/vm/src/builtins/union.rs
+++ b/vm/src/builtins/union.rs
@@ -198,7 +198,7 @@ fn dedup_and_flatten_args(args: PyTupleRef, vm: &VirtualMachine) -> PyTupleRef {
         if !new_args.iter().any(|param| {
             param
                 .rich_compare_bool(arg, PyComparisonOp::Eq, vm)
-                .unwrap()
+                .expect("types are always comparable")
         }) {
             new_args.push(arg.clone());
         }