From 980aba77a9f037b68531fb9bc4c8ec9d6eb7a080 Mon Sep 17 00:00:00 2001
From: Stephen Chung <Stephen.Chung@intexact.com>
Date: Wed, 19 Aug 2020 12:53:33 +0800
Subject: [PATCH] Use &mut.

---
 src/packages/string_more.rs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/packages/string_more.rs b/src/packages/string_more.rs
index 087e8e90..99af280d 100644
--- a/src/packages/string_more.rs
+++ b/src/packages/string_more.rs
@@ -22,12 +22,12 @@ macro_rules! gen_concat_functions {
                 use super::super::*;
 
                 #[export_fn]
-                pub fn append_func(x: ImmutableString, y: $arg_type) -> String {
+                pub fn append_func(x: &mut ImmutableString, y: $arg_type) -> String {
                     super::super::add_append(x, y)
                 }
 
                 #[export_fn]
-                pub fn prepend_func(x: $arg_type, y: ImmutableString) -> String {
+                pub fn prepend_func(x: &mut $arg_type, y: ImmutableString) -> String {
                     super::super::add_prepend(x, y)
                 }
             }
@@ -120,10 +120,10 @@ def_package!(crate:MoreStringPackage:"Additional string utilities, including str
     );
 });
 
-fn add_prepend<T: Display>(x: T, y: ImmutableString) -> String {
+fn add_prepend<T: Display>(x: &mut T, y: ImmutableString) -> String {
     format!("{}{}", x, y)
 }
-fn add_append<T: Display>(x: ImmutableString, y: T) -> String {
+fn add_append<T: Display>(x: &mut ImmutableString, y: T) -> String {
     format!("{}{}", x, y)
 }