impl<T> [T]

2 files changed, 13 insertions, 0 deletions

diff --git a/src/libstd/sys/common/wtf8.rs b/src/libstd/sys/common/wtf8.rs
index 4c0b26f8649..dfc88571a82 100644
--- a/src/libstd/sys/common/wtf8.rs
+++ b/src/libstd/sys/common/wtf8.rs
@@ -172,6 +172,7 @@ impl Wtf8Buf {
         Wtf8Buf { bytes: string.into_bytes() }
     }
 
+    #[cfg(stage0)]
     /// Create a WTF-8 string from an UTF-8 `&str` slice.
     ///
     /// This copies the content of the slice.
@@ -182,6 +183,17 @@ impl Wtf8Buf {
         Wtf8Buf { bytes: slice::SliceExt::to_vec(str.as_bytes()) }
     }
 
+    #[cfg(not(stage0))]
+    /// Create a WTF-8 string from an UTF-8 `&str` slice.
+    ///
+    /// This copies the content of the slice.
+    ///
+    /// Since WTF-8 is a superset of UTF-8, this always succeeds.
+    #[inline]
+    pub fn from_str(str: &str) -> Wtf8Buf {
+        Wtf8Buf { bytes: <[_]>::to_vec(str.as_bytes()) }
+    }
+
     /// Create a WTF-8 string from a potentially ill-formed UTF-16 slice of 16-bit code units.
     ///
     /// This is lossless: calling `.encode_wide()` on the resulting string
diff --git a/src/libstd/sys/unix/os_str.rs b/src/libstd/sys/unix/os_str.rs
index 89ab3e1981b..99591480752 100644
--- a/src/libstd/sys/unix/os_str.rs
+++ b/src/libstd/sys/unix/os_str.rs
@@ -16,6 +16,7 @@ use core::prelude::*;
 use borrow::Cow;
 use fmt::{self, Debug};
 use vec::Vec;
+#[cfg(stage0)]
 use slice::SliceExt as StdSliceExt;
 use str;
 use string::String;