4 files changed, 14 insertions, 12 deletions
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 7416e213792..380641a8689 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -728,8 +728,8 @@ pub enum Lit_ {
     LitInt(i64, IntTy),
     LitUint(u64, UintTy),
     LitIntUnsuffixed(i64),
-    LitFloat(@str, FloatTy),
-    LitFloatUnsuffixed(@str),
+    LitFloat(InternedString, FloatTy),
+    LitFloatUnsuffixed(InternedString),
     LitNil,
     LitBool(bool),
 }
diff --git a/src/libsyntax/ext/concat.rs b/src/libsyntax/ext/concat.rs
index f570ca4c1bf..c13f9bf92af 100644
--- a/src/libsyntax/ext/concat.rs
+++ b/src/libsyntax/ext/concat.rs
@@ -29,12 +29,11 @@ pub fn expand_syntax_ext(cx: &mut base::ExtCtxt,
         match e.node {
             ast::ExprLit(lit) => {
                 match lit.node {
-                    ast::LitStr(ref s, _) => {
+                    ast::LitStr(ref s, _) |
+                    ast::LitFloat(ref s, _) |
+                    ast::LitFloatUnsuffixed(ref s) => {
                         accumulator.push_str(s.get());
                     }
-                    ast::LitFloat(s, _) | ast::LitFloatUnsuffixed(s) => {
-                        accumulator.push_str(s);
-                    }
                     ast::LitChar(c) => {
                         accumulator.push_char(char::from_u32(c).unwrap());
                     }
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 636dc504ff2..e86873d6418 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -1405,9 +1405,12 @@ impl Parser {
             token::LIT_INT(i, it) => LitInt(i, it),
             token::LIT_UINT(u, ut) => LitUint(u, ut),
             token::LIT_INT_UNSUFFIXED(i) => LitIntUnsuffixed(i),
-            token::LIT_FLOAT(s, ft) => LitFloat(self.id_to_str(s), ft),
-            token::LIT_FLOAT_UNSUFFIXED(s) =>
-                LitFloatUnsuffixed(self.id_to_str(s)),
+            token::LIT_FLOAT(s, ft) => {
+                LitFloat(self.id_to_interned_str(s), ft)
+            }
+            token::LIT_FLOAT_UNSUFFIXED(s) => {
+                LitFloatUnsuffixed(self.id_to_interned_str(s))
+            }
             token::LIT_STR(s) => {
                 LitStr(self.id_to_interned_str(s), ast::CookedStr)
             }
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index 8bf439818a2..d2a388cc14d 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -2202,10 +2202,10 @@ pub fn print_literal(s: &mut State, lit: &ast::Lit) {
             word(&mut s.s, (i as u64).to_str_radix(10u));
         }
       }
-      ast::LitFloat(f, t) => {
-        word(&mut s.s, f.to_owned() + ast_util::float_ty_to_str(t));
+      ast::LitFloat(ref f, t) => {
+        word(&mut s.s, f.get() + ast_util::float_ty_to_str(t));
       }
-      ast::LitFloatUnsuffixed(f) => word(&mut s.s, f),
+      ast::LitFloatUnsuffixed(ref f) => word(&mut s.s, f.get()),
       ast::LitNil => word(&mut s.s, "()"),
       ast::LitBool(val) => {
         if val { word(&mut s.s, "true"); } else { word(&mut s.s, "false"); }