From 99acbc5de3f5c484d3f7d1a95b969efc64fb45ba Mon Sep 17 00:00:00 2001
From: Antoine D <antoine.desbordes@gmail.com>
Date: Mon, 22 Oct 2018 15:36:27 +0200
Subject: [PATCH] remove a warning about unused macro

this the macro in serde_json is used only in test, remove it  for non
test.

solution found
[here)(https://github.com/rust-lang/rust/issues/44342#issuecomment-389054189)
---
 src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index c42c69a..d74031e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -30,7 +30,7 @@ extern crate serde_derive;
 
 extern crate serde;
 
-#[macro_use]
+#[cfg_attr(test, macro_use)]
 extern crate serde_json;
 
 #[macro_use]