Update to rust 2018 importing macros.

eth2/fork_choice/src/bitwise_lmd_ghost.rs

@@ -8,6 +8,7 @@ use db::{
     ClientDB,
 };
 use fast_math::log2_raw;
+use log::{debug, trace};
 use std::collections::HashMap;
 use std::sync::Arc;
 use types::{

eth2/fork_choice/src/lib.rs

@@ -19,8 +19,6 @@
 extern crate db;
 extern crate ssz;
 extern crate types;
-#[macro_use]
-extern crate log;
 
 pub mod bitwise_lmd_ghost;
 pub mod longest_chain;

eth2/fork_choice/src/slow_lmd_ghost.rs

@@ -5,6 +5,7 @@ use db::{
     stores::{BeaconBlockStore, BeaconStateStore},
     ClientDB,
 };
+use log::{debug, trace};
 use std::collections::HashMap;
 use std::sync::Arc;
 use types::{