---

yaml
---
r: 277630
b: refs/heads/try
c: 9370d3a
h: refs/heads/master

Author: tbu-

[refs]

@@ -1,7 +1,7 @@
 ---
 refs/heads/master: 6dbb0e86aec11050480beb76eade6fb805010ba7
 refs/heads/snap-stage3: 235d77457d80b549dad3ac36d94f235208a1eafb
-refs/heads/try: 77987ba89894997c174ac8b01185c0dc12913fa5
+refs/heads/try: 9370d3a05107bdcac6fb62d3bd5380e1d7c79b5b
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/tags/release-0.2: c870d2dffb391e14efb05aa27898f1f6333a9596
 refs/tags/release-0.3: b5f0d0f648d9a6153664837026ba1be43d3e2503

branches/try/src/libcore/cell.rs

@@ -232,6 +232,18 @@ impl<T:Copy> Cell<T> {
     pub fn as_unsafe_cell(&self) -> &UnsafeCell<T> {
         &self.value
     }
+
+    /// Returns a mutable reference to the underlying data.
+    ///
+    /// This call borrows `Cell` mutably (at compile-time) which guarantees
+    /// that we possess the only reference.
+    #[inline]
+    #[unstable(feature = "cell_get_mut", issue = "33444")]
+    pub fn get_mut(&mut self) -> &mut T {
+        unsafe {
+            &mut *self.value.get()
+        }
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
@@ -455,6 +467,18 @@ impl<T: ?Sized> RefCell<T> {
     pub unsafe fn as_unsafe_cell(&self) -> &UnsafeCell<T> {
         &self.value
     }
+
+    /// Returns a mutable reference to the underlying data.
+    ///
+    /// This call borrows `RefCell` mutably (at compile-time) so there is no
+    /// need for dynamic checks.
+    #[inline]
+    #[unstable(feature = "cell_get_mut", issue="33444")]
+    pub fn get_mut(&mut self) -> &mut T {
+        unsafe {
+            &mut *self.value.get()
+        }
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]

branches/try/src/libstd/ffi/c_str.rs

@@ -326,22 +326,6 @@ impl fmt::Debug for CStr {
     }
 }
 
-#[stable(feature = "cstr_default", since = "1.10.0")]
-impl<'a> Default for &'a CStr {
-    fn default() -> &'a CStr {
-        static SLICE: &'static [c_char] = &[0];
-        unsafe { CStr::from_ptr(SLICE.as_ptr()) }
-    }
-}
-
-#[stable(feature = "cstr_default", since = "1.10.0")]
-impl Default for CString {
-    fn default() -> CString {
-        let a: &CStr = Default::default();
-        a.to_owned()
-    }
-}
-
 #[stable(feature = "cstr_borrow", since = "1.3.0")]
 impl Borrow<CStr> for CString {
     fn borrow(&self) -> &CStr { self }