From 63909a0744a93537e9b58390d6c30f86aebd43d9 Mon Sep 17 00:00:00 2001
From: Enok <416828041@qq.com>
Date: Tue, 19 Jan 2021 22:39:30 +0800
Subject: [PATCH] fix lint

---
 test_ffi/src/lib.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/test_ffi/src/lib.rs b/test_ffi/src/lib.rs
index cdcb6456d5cd9a..ce1a40a8f8c8c9 100644
--- a/test_ffi/src/lib.rs
+++ b/test_ffi/src/lib.rs
@@ -57,8 +57,8 @@ pub fn add_one_f64(arg: f64) -> f64 {
 }
 
 #[no_mangle]
-pub extern "C" fn concat_string(str: *const c_char) -> *const c_char {
-  let str = unsafe { CStr::from_ptr(str) };
+pub unsafe extern "C" fn concat_string(str: *const c_char) -> *const c_char {
+  let str = CStr::from_ptr(str);
   let mut hello = String::from("hello ");
   hello.push_str(str.to_str().unwrap());
   let str = CString::new(hello).unwrap();