1 files changed, 4 insertions, 4 deletions
diff --git a/src/libsyntax/ext/concat.rs b/src/libsyntax/ext/concat.rs
index 03dd08fdf7f..1f1781dceb3 100644
--- a/src/libsyntax/ext/concat.rs
+++ b/src/libsyntax/ext/concat.rs
@@ -40,14 +40,14 @@ pub fn expand_syntax_ext(cx: &mut base::ExtCtxt,
                     ast::LitInt(i, ast::UnsignedIntLit(_)) |
                     ast::LitInt(i, ast::SignedIntLit(_, ast::Plus)) |
                     ast::LitInt(i, ast::UnsuffixedIntLit(ast::Plus)) => {
-                        accumulator.push_str(format!("{}", i)[]);
+                        accumulator.push_str(format!("{}", i).index(&FullRange));
                     }
                     ast::LitInt(i, ast::SignedIntLit(_, ast::Minus)) |
                     ast::LitInt(i, ast::UnsuffixedIntLit(ast::Minus)) => {
-                        accumulator.push_str(format!("-{}", i)[]);
+                        accumulator.push_str(format!("-{}", i).index(&FullRange));
                     }
                     ast::LitBool(b) => {
-                        accumulator.push_str(format!("{}", b)[]);
+                        accumulator.push_str(format!("{}", b).index(&FullRange));
                     }
                     ast::LitByte(..) |
                     ast::LitBinary(..) => {
@@ -62,5 +62,5 @@ pub fn expand_syntax_ext(cx: &mut base::ExtCtxt,
     }
     base::MacExpr::new(cx.expr_str(
             sp,
-            token::intern_and_get_ident(accumulator[])))
+            token::intern_and_get_ident(accumulator.index(&FullRange))))
 }