Merge pull request #2116 from tyranron/fix-unused-results

Fix `unused_results` complaining rustc lint in codegen for adjacently tagged enum

Author: dtolnay

serde/src/private/mod.rs

@@ -13,6 +13,7 @@ pub use lib::convert::{From, Into};
 pub use lib::default::Default;
 pub use lib::fmt::{self, Formatter};
 pub use lib::marker::PhantomData;
+pub use lib::mem;
 pub use lib::option::Option::{self, None, Some};
 pub use lib::ptr;
 pub use lib::result::Result::{self, Err, Ok};

serde_derive/src/de.rs

@@ -1458,7 +1458,7 @@ fn deserialize_adjacently_tagged_enum(
             while let _serde::__private::Some(__k) = #next_key {
                 match __k {
                     _serde::__private::de::TagContentOtherField::Other => {
-                        try!(_serde::de::MapAccess::next_value::<_serde::de::IgnoredAny>(&mut __map));
+                        _serde::__private::mem::drop(try!(_serde::de::MapAccess::next_value::<_serde::de::IgnoredAny>(&mut __map)));
                         continue;
                     },
                     _serde::__private::de::TagContentOtherField::Tag => {