1 files changed, 1 insertions, 2 deletions
diff --git a/src/libsyntax/ext/asm.rs b/src/libsyntax/ext/asm.rs
index b138811187b..b77b822a6b2 100644
--- a/src/libsyntax/ext/asm.rs
+++ b/src/libsyntax/ext/asm.rs
@@ -100,8 +100,7 @@ pub fn expand_asm<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
                         Some(('=', _)) => None,
                         Some(('+', operand)) => {
                             Some(token::intern_and_get_ident(format!(
-                                        "={}",
-                                        operand).as_slice()))
+                                        "={}", operand)[]))
                         }
                         _ => {
                             cx.span_err(span, "output operand constraint lacks '=' or '+'");