1 files changed, 6 insertions, 6 deletions
diff --git a/src/libsyntax/ext/tt/transcribe.rs b/src/libsyntax/ext/tt/transcribe.rs
index 67a15b149f6..549e5f00dce 100644
--- a/src/libsyntax/ext/tt/transcribe.rs
+++ b/src/libsyntax/ext/tt/transcribe.rs
@@ -19,11 +19,11 @@ use OneVector;
 use syntax_pos::{Span, DUMMY_SP};
 use tokenstream::{TokenStream, TokenTree, Delimited};
 
-use std::rc::Rc;
+use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sync::Lrc;
 use std::mem;
 use std::ops::Add;
-use std::collections::HashMap;
+use std::rc::Rc;
 
 // An iterator over the token trees in a delimited token tree (`{ ... }`) or a sequence (`$(...)`).
 enum Frame {
@@ -67,11 +67,11 @@ impl Iterator for Frame {
 /// `src` contains no `TokenTree::{Sequence, MetaVar, MetaVarDecl}`s, `interp` can
 /// (and should) be None.
 pub fn transcribe(cx: &ExtCtxt,
-                  interp: Option<HashMap<Ident, Rc<NamedMatch>>>,
+                  interp: Option<FxHashMap<Ident, Rc<NamedMatch>>>,
                   src: Vec<quoted::TokenTree>)
                   -> TokenStream {
     let mut stack: OneVector<Frame> = smallvec![Frame::new(src)];
-    let interpolations = interp.unwrap_or_else(HashMap::new); /* just a convenience */
+    let interpolations = interp.unwrap_or_else(FxHashMap::default); /* just a convenience */
     let mut repeats = Vec::new();
     let mut result: Vec<TokenStream> = Vec::new();
     let mut result_stack = Vec::new();
@@ -187,7 +187,7 @@ pub fn transcribe(cx: &ExtCtxt,
 }
 
 fn lookup_cur_matched(ident: Ident,
-                      interpolations: &HashMap<Ident, Rc<NamedMatch>>,
+                      interpolations: &FxHashMap<Ident, Rc<NamedMatch>>,
                       repeats: &[(usize, usize)])
                       -> Option<Rc<NamedMatch>> {
     interpolations.get(&ident).map(|matched| {
@@ -234,7 +234,7 @@ impl Add for LockstepIterSize {
 }
 
 fn lockstep_iter_size(tree: &quoted::TokenTree,
-                      interpolations: &HashMap<Ident, Rc<NamedMatch>>,
+                      interpolations: &FxHashMap<Ident, Rc<NamedMatch>>,
                       repeats: &[(usize, usize)])
                       -> LockstepIterSize {
     use self::quoted::TokenTree;