Migrate everything to the 2018 edition (#1758)

substrate/core/test-runtime/src/lib.rs

@@ -18,9 +18,6 @@
 
 #![cfg_attr(not(feature = "std"), no_std)]
 
-#[macro_use]
-extern crate srml_support as runtime_support;
-
 #[cfg(feature = "std")] pub mod genesismap;
 pub mod system;
 

substrate/core/test-runtime/src/system.rs

@@ -20,6 +20,7 @@
 use rstd::prelude::*;
 use runtime_io::{storage_root, enumerated_trie_root, storage_changes_root, twox_128};
 use runtime_support::storage::{self, StorageValue, StorageMap};
+use runtime_support::storage_items;
 use runtime_primitives::traits::{Hash as HashT, BlakeTwo256, Digest as DigestT};
 use runtime_primitives::generic;
 use runtime_primitives::{ApplyError, ApplyOutcome, ApplyResult, transaction_validity::TransactionValidity};