Added support basic deserialization in derive

serde/src/de/mod.rs

@@ -255,6 +255,13 @@ macro_rules! declare_error_trait {
                 }
             }
 
+            /// Raised when a `Deserialize` struct type recieved a field with an
+            /// unrecognized name but the names are not actually known because of
+            /// flattening.
+            fn unknow_field_in_flattened_structure(field: &str) -> Self {
+                Error::custom(format_args!("unknown field `{}`", field))
+            }
+
             /// Raised when a `Deserialize` struct type expected to receive a required
             /// field with a particular name but that field was not present in the
             /// input.

serde/src/export.rs

@@ -13,7 +13,6 @@ pub use lib::fmt::{self, Formatter};
 pub use lib::marker::PhantomData;
 pub use lib::option::Option::{self, None, Some};
 pub use lib::result::Result::{self, Err, Ok};
-pub use lib::iter::once;
 
 pub use self::string::from_utf8_lossy;