Migrate sr-primitives, sr-sandbox, sr-std and sr-version to the 2018 edition (#1694)

substrate/core/sr-version/src/lib.rs

@@ -19,18 +19,7 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 
 #[cfg(feature = "std")]
-#[macro_use]
-extern crate serde_derive;
-
-#[allow(unused_imports)]
-#[macro_use]
-extern crate sr_std as rstd;
-
-#[macro_use]
-extern crate parity_codec_derive;
-
-extern crate sr_primitives as runtime_primitives;
-
+use serde_derive::Serialize;
 #[cfg(feature = "std")]
 use std::fmt;
 #[cfg(feature = "std")]
@@ -70,8 +59,8 @@ macro_rules! create_apis_vec {
 /// This triplet have different semantics and mis-interpretation could cause problems.
 /// In particular: bug fixes should result in an increment of `spec_version` and possibly `authoring_version`,
 /// absolutely not `impl_version` since they change the semantics of the runtime.
-#[derive(Clone, PartialEq, Eq, Encode)]
-#[cfg_attr(feature = "std", derive(Debug, Serialize, Decode))]
+#[derive(Clone, PartialEq, Eq, parity_codec_derive::Encode)]
+#[cfg_attr(feature = "std", derive(Debug, Serialize, parity_codec_derive::Decode))]
 #[cfg_attr(feature = "std", serde(rename_all = "camelCase"))]
 pub struct RuntimeVersion {
 	/// Identifies the different Substrate runtimes. There'll be at least polkadot and node.