cleanup: replace `as[_mut]_slice()` calls with deref coercions

1 files changed, 9 insertions, 9 deletions

diff --git a/src/libsyntax/ext/tt/macro_rules.rs b/src/libsyntax/ext/tt/macro_rules.rs
index ac9f375e0a4..de61bdefa5d 100644
--- a/src/libsyntax/ext/tt/macro_rules.rs
+++ b/src/libsyntax/ext/tt/macro_rules.rs
@@ -319,11 +319,11 @@ fn check_matcher<'a, I>(cx: &mut ExtCtxt, matcher: I, follow: &Token)
                     Some(&&TtToken(_, ref tok)) => tok.clone(),
                     Some(&&TtSequence(sp, _)) => {
                         cx.span_err(sp,
-                                    format!("`${0}:{1}` is followed by a \
-                                             sequence repetition, which is not \
-                                             allowed for `{1}` fragments",
-                                            name.as_str(), frag_spec.as_str())
-                                        .as_slice());
+                                    &format!("`${0}:{1}` is followed by a \
+                                              sequence repetition, which is not \
+                                              allowed for `{1}` fragments",
+                                             name.as_str(), frag_spec.as_str())
+                                        );
                         Eof
                     },
                     // die next iteration
@@ -338,14 +338,14 @@ fn check_matcher<'a, I>(cx: &mut ExtCtxt, matcher: I, follow: &Token)
                     (&Eof, _) => return Some((sp, tok.clone())),
                     (_, Ok(true)) => continue,
                     (next, Ok(false)) => {
-                        cx.span_err(sp, format!("`${0}:{1}` is followed by `{2}`, which \
-                                                 is not allowed for `{1}` fragments",
+                        cx.span_err(sp, &format!("`${0}:{1}` is followed by `{2}`, which \
+                                                  is not allowed for `{1}` fragments",
                                                  name.as_str(), frag_spec.as_str(),
-                                                 token_to_string(next)).as_slice());
+                                                 token_to_string(next)));
                         continue
                     },
                     (_, Err(msg)) => {
-                        cx.span_err(sp, msg.as_slice());
+                        cx.span_err(sp, &msg);
                         continue
                     }
                 }