Remove OwnedStr trait

This trait was only implemented by `String`. It provided the methods
`into_bytes` and `append`, both of which **are already implemented as normal
methods** of `String` (not as trait methods). This change improves the
consistency of strings.

This shouldn't break any code, except if somebody has implemented
`OwnedStr` for a user-defined type.

src/libcollections/str.rs

@@ -603,11 +603,6 @@ pub mod raw {
         from_utf8_owned(vec![u])
     }
 
-    /// Sets the length of a string
-    ///
-    /// This will explicitly set the size of the string, without actually
-    /// modifying its buffers, so it is up to the caller to ensure that
-    /// the string is actually the specified size.
     #[test]
     fn test_from_buf_len() {
         use slice::ImmutableVector;
@@ -785,30 +780,6 @@ impl<'a> StrAllocating for &'a str {
     }
 }
 
-/// Methods for owned strings
-pub trait OwnedStr {
-    /// Consumes the string, returning the underlying byte buffer.
-    ///
-    /// The buffer does not have a null terminator.
-    fn into_bytes(self) -> Vec<u8>;
-
-    /// Pushes the given string onto this string, returning the concatenation of the two strings.
-    fn append(self, rhs: &str) -> String;
-}
-
-impl OwnedStr for String {
-    #[inline]
-    fn into_bytes(self) -> Vec<u8> {
-        unsafe { mem::transmute(self) }
-    }
-
-    #[inline]
-    fn append(mut self, rhs: &str) -> String {
-        self.push_str(rhs);
-        self
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use std::iter::AdditiveIterator;

src/libstd/ascii.rs

@@ -20,7 +20,7 @@ use iter::Iterator;
 use mem;
 use option::{Option, Some, None};
 use slice::{ImmutableVector, MutableVector, Vector};
-use str::{OwnedStr, Str, StrAllocating, StrSlice};
+use str::{Str, StrAllocating, StrSlice};
 use string::String;
 use to_string::IntoStr;
 use vec::Vec;

src/libstd/os.rs

@@ -56,8 +56,6 @@ use vec::Vec;
 use c_str::ToCStr;
 #[cfg(unix)]
 use libc::c_char;
-#[cfg(windows)]
-use str::OwnedStr;
 
 /// Get the number of cores available
 pub fn num_cpus() -> uint {
@@ -708,8 +706,6 @@ pub fn self_exe_name() -> Option<Path> {
 
     #[cfg(windows)]
     fn load_self() -> Option<Vec<u8>> {
-        use str::OwnedStr;
-
         unsafe {
             use os::win32::fill_utf16_buf_and_decode;
             fill_utf16_buf_and_decode(|buf, sz| {

src/libstd/prelude.rs

@@ -76,7 +76,7 @@
 #[doc(no_inline)] pub use path::{GenericPath, Path, PosixPath, WindowsPath};
 #[doc(no_inline)] pub use ptr::RawPtr;
 #[doc(no_inline)] pub use io::{Buffer, Writer, Reader, Seek};
-#[doc(no_inline)] pub use str::{Str, StrVector, StrSlice, OwnedStr};
+#[doc(no_inline)] pub use str::{Str, StrVector, StrSlice};
 #[doc(no_inline)] pub use str::{IntoMaybeOwned, StrAllocating, UnicodeStrSlice};
 #[doc(no_inline)] pub use to_string::{ToString, IntoStr};
 #[doc(no_inline)] pub use tuple::{Tuple1, Tuple2, Tuple3, Tuple4};