refactor libcollections as part of collection reform

* Moves multi-collection files into their own directory, and splits them into seperate files
* Changes exports so that each collection has its own module
* Adds underscores to public modules and filenames to match standard naming conventions

(that is, treemap::{TreeMap, TreeSet} => tree_map::TreeMap, tree_set::TreeSet)

* Renames PriorityQueue to BinaryHeap
* Renames SmallIntMap to VecMap
* Miscellanious fallout fixes

[breaking-change]

1 files changed, 1 insertions, 1 deletions

diff --git a/src/librustc/lint/builtin.rs b/src/librustc/lint/builtin.rs
index 3e53620cbd4..e20f76622c9 100644
--- a/src/librustc/lint/builtin.rs
+++ b/src/librustc/lint/builtin.rs
@@ -36,7 +36,7 @@ use lint::{Context, LintPass, LintArray};
 
 use std::cmp;
 use std::collections::HashMap;
-use std::collections::hashmap::{Occupied, Vacant};
+use std::collections::hash_map::{Occupied, Vacant};
 use std::slice;
 use std::{i8, i16, i32, i64, u8, u16, u32, u64, f32, f64};
 use syntax::abi;