Upgrade remaining components to edition 2018

components/hashglobe/Cargo.toml

@@ -7,6 +7,7 @@ description = "Fork of std::HashMap with stable fallible allocation."
 documentation = "https://docs.rs/hashglobe"
 repository = "https://github.com/Manishearth/hashglobe"
 readme = "README.md"
+edition = "2018"
 
 [dependencies]
 libc = "0.2"

components/hashglobe/src/hash_map.rs

@@ -2218,7 +2218,7 @@ mod test_map {
     use super::Entry::{Occupied, Vacant};
     use super::HashMap;
     use super::RandomState;
-    use cell::RefCell;
+    use std::cell::RefCell;
 
     #[test]
     fn test_zero_capacities() {

components/hashglobe/src/hash_set.rs

@@ -1577,7 +1577,7 @@ mod test_set {
 
     #[test]
     fn test_replace() {
-        use hash;
+        use std::hash;
 
         #[derive(Debug)]
         struct Foo(&'static str, i32);