2 files changed, 2 insertions, 2 deletions
diff --git a/src/libstd/os.rs b/src/libstd/os.rs
index c6948cccafe..d904e657e40 100644
--- a/src/libstd/os.rs
+++ b/src/libstd/os.rs
@@ -144,7 +144,7 @@ pub mod windows {
     use option::{None, Option};
     use option;
     use os::TMPBUF_SZ;
-    use slice::MutableSlice;
+    use slice::{MutableSlice, ImmutableSlice};
     use string::String;
     use str::StrSlice;
     use vec::Vec;
diff --git a/src/libstd/rt/backtrace.rs b/src/libstd/rt/backtrace.rs
index e1925fc79d0..33f8713e1a1 100644
--- a/src/libstd/rt/backtrace.rs
+++ b/src/libstd/rt/backtrace.rs
@@ -999,7 +999,7 @@ mod imp {
                 let bytes = cstr.as_bytes();
                 match cstr.as_str() {
                     Some(s) => try!(super::demangle(w, s)),
-                    None => try!(w.write(bytes[..bytes.len()-1])),
+                    None => try!(w.write(bytes.slice_to(bytes.len() - 1))),
                 }
             }
             try!(w.write(['\n' as u8]));