From 6dbaea34ba1e00c570bbfce5c0fe920fd1b7a715 Mon Sep 17 00:00:00 2001
From: Josh Chase <josh@jec.pw>
Date: Thu, 28 Jun 2018 10:51:57 -0400
Subject: [PATCH] Suppress 'extern crate' warning for rust 2018

---
 serde_derive/src/de.rs  | 2 ++
 serde_derive/src/ser.rs | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/serde_derive/src/de.rs b/serde_derive/src/de.rs
index 216e4b34..87a6d5ca 100644
--- a/serde_derive/src/de.rs
+++ b/serde_derive/src/de.rs
@@ -73,6 +73,8 @@ pub fn expand_derive_deserialize(input: &syn::DeriveInput) -> Result<TokenStream
     let generated = quote! {
         #[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
         const #dummy_const: () = {
+            #[allow(unknown_lints)]
+            #[allow(rust_2018_idioms)]
             extern crate serde as _serde;
             #try_replacement
             #impl_block
diff --git a/serde_derive/src/ser.rs b/serde_derive/src/ser.rs
index c78237bf..146546de 100644
--- a/serde_derive/src/ser.rs
+++ b/serde_derive/src/ser.rs
@@ -61,6 +61,8 @@ pub fn expand_derive_serialize(input: &syn::DeriveInput) -> Result<TokenStream,
     let generated = quote! {
         #[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
         const #dummy_const: () = {
+            #[allow(unknown_lints)]
+            #[allow(rust_2018_idioms)]
             extern crate serde as _serde;
             #try_replacement
             #impl_block