From 8b67a9a9bca2ae5f3314f0daffe1dc6e617bb075 Mon Sep 17 00:00:00 2001
From: Stephen Chung <schungx@live.com>
Date: Wed, 24 Feb 2021 11:05:16 +0800
Subject: [PATCH] Do not test for op-assignment when not ending with '='.

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

diff --git a/src/fn_call.rs b/src/fn_call.rs
index d8e7723c..fa066981 100644
--- a/src/fn_call.rs
+++ b/src/fn_call.rs
@@ -295,7 +295,7 @@ impl Engine {
                 None => (),
             }
 
-            if is_ref {
+            if is_ref && fn_name.ends_with('=') {
                 let (first, second) = args.split_first_mut().unwrap();
 
                 match run_builtin_op_assignment(fn_name, first, second[0])? {