From ec18bd26a2cad01e0839b9ba0395af8a83370163 Mon Sep 17 00:00:00 2001
From: Stephen Chung <schungx@live.com>
Date: Thu, 7 Jan 2021 22:52:20 +0800
Subject: [PATCH] Handle no-std without sync.

---
 src/stdlib.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/stdlib.rs b/src/stdlib.rs
index 165b9068..0c0e0438 100644
--- a/src/stdlib.rs
+++ b/src/stdlib.rs
@@ -11,7 +11,10 @@ mod inner {
     #[cfg(not(target_arch = "wasm32"))]
     pub use core::{i128, u128};
 
-    pub use alloc::{borrow, boxed, format, rc, string, sync, vec};
+    #[cfg(feature = "sync")]
+    pub use alloc::sync;
+
+    pub use alloc::{borrow, boxed, format, rc, string, vec};
 
     pub use core_error as error;