-extern crate collections;
-
-use collections::BinaryHeap;
-use collections::{BTreeMap, BTreeSet};
-use collections::EnumSet;
-use collections::LinkedList;
-use collections::String;
-use collections::Vec;
-use collections::VecDeque;
+use std::collections::BinaryHeap;
+use std::collections::{BTreeMap, BTreeSet};
+use std::collections::LinkedList;
+use std::collections::VecDeque;