free or reuse unconditionally when value is unique

crates/compiler/mono/src/code_gen_help/mod.rs

@@ -141,6 +141,7 @@ impl<'a> CodeGenHelp<'a> {
                 let jp_decref = JoinPointId(self.create_symbol(ident_ids, "jp_decref"));
                 HelperOp::DecRef(jp_decref)
             }
+            ModifyRc::Free(_) => unreachable!("free should be handled by the backend directly"),
         };
 
         let mut ctx = Context {

crates/compiler/mono/src/code_gen_help/refcount.rs

@@ -118,6 +118,9 @@ pub fn refcount_stmt<'a>(
                 },
             }
         }
+        ModifyRc::Free(_) => {
+            unreachable!("free should be handled by the backend directly")
+        }
     }
 }