2 files changed, 2 insertions, 2 deletions
diff --git a/src/libstd/rt/unwind.rs b/src/libstd/rt/unwind.rs
index 7d886f9936f..18298f1c7f4 100644
--- a/src/libstd/rt/unwind.rs
+++ b/src/libstd/rt/unwind.rs
@@ -152,7 +152,7 @@ pub unsafe fn try<F: FnOnce()>(f: F) -> Result<(), Box<Any + Send>> {
     }
 }
 
-/// Test if the current thread is currently panicking.
+/// Determines whether the current thread is unwinding because of panic.
 pub fn panicking() -> bool {
     PANICKING.with(|s| s.get())
 }
diff --git a/src/libstd/rt/util.rs b/src/libstd/rt/util.rs
index 235cedcda52..4023a0a4c10 100644
--- a/src/libstd/rt/util.rs
+++ b/src/libstd/rt/util.rs
@@ -130,7 +130,7 @@ pub fn abort(args: fmt::Arguments) -> ! {
     }
     impl<'a> fmt::Writer for BufWriter<'a> {
         fn write_str(&mut self, bytes: &str) -> fmt::Result {
-            let left = self.buf.slice_from_mut(self.pos);
+            let left = &mut self.buf[self.pos..];
             let to_write = &bytes.as_bytes()[..cmp::min(bytes.len(), left.len())];
             slice::bytes::copy_memory(left, to_write);
             self.pos += to_write.len();