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+- Feature Name: panic_safe_slicing
+- Start Date: 2015-10-16
+- RFC PR: (leave this empty)
+- Rust Issue: (leave this empty)
+
+# Summary
+
+Add "panic-safe" or "total" alternatives to the existing panicking indexing syntax.
+
+# Motivation
+
+`SliceExt::get` and `SliceExt::get_mut` can be thought as non-panicking versions of the simple
+indexing syntax, `a[idx]`, and `SliceExt::get_unchecked` and `SliceExt::get_unchecked_mut` can
+be thought of as unsafe versions with bounds checks elided. However, there is no such equivalent for
+`a[start..end]`, `a[start..]`, or `a[..end]`. This RFC proposes such methods to fill the gap.
+
+# Detailed design
+
+The `get`, `get_mut`, `get_unchecked`, and `get_unchecked_mut` will be made generic over `usize`
+as well as ranges of `usize` like slice's `Index` implementation currently is. This will allow e.g.
+`a.get(start..end)` which will behave analagously to `a[start..end]`.
+
+Because methods cannot be overloaded in an ad-hoc manner in the same way that traits may be
+implemented, we introduce a `SliceIndex` trait which is implemented by types which can index into a
+slice:
+```rust
+pub trait SliceIndex<T> {
+    type Output: ?Sized;
+
+    fn get(self, slice: &[T]) -> Option<&Self::Output>;
+    fn get_mut(self, slice: &mut [T]) -> Option<&mut Self::Output>;
+    unsafe fn get_unchecked(self, slice: &[T]) -> &Self::Output;
+    unsafe fn get_mut_unchecked(self, slice: &[T]) -> &mut Self::Output;
+    fn index(self, slice: &[T]) -> &Self::Output;
+    fn index_mut(self, slice: &mut [T]) -> &mut Self::Output;
+}
+
+impl<T> SliceIndex<T> for usize {
+    type Output = T;
+    // ...
+}
+
+impl<T, R> SliceIndex<T> for R
+    where R: RangeArgument<usize>
+{
+    type Output = [T];
+    // ...
+}
+```
+
+And then alter the `Index`, `IndexMut`, `get`, `get_mut`, `get_unchecked`, and `get_mut_unchecked`
+implementations to be generic over `SliceIndex`:
+```rust
+impl<T> [T] {
+    pub fn get<I>(&self, idx: I) -> Option<I::Output>
+        where I: SliceIndex<T>
+    {
+        idx.get(self)
+    }
+
+    pub fn get_mut<I>(&mut self, idx: I) -> Option<I::Output>
+        where I: SliceIndex<T>
+    {
+        idx.get_mut(self)
+    }
+
+    pub unsafe fn get_unchecked<I>(&self, idx: I) -> I::Output
+        where I: SliceIndex<T>
+    {
+        idx.get_unchecked(self)
+    }
+
+    pub unsafe fn get_mut_unchecked<I>(&mut self, idx: I) -> I::Output
+        where I: SliceIndex<T>
+    {
+        idx.get_mut_unchecked(self)
+    }
+}
+
+impl<T, I> Index<I> for [T]
+    where I: SliceIndex<T>
+{
+    type Output = I::Output;
+
+    fn index(&self, idx: I) -> &I::Output {
+        idx.index(self)
+    }
+}
+
+impl<T, I> IndexMut<I> for [T]
+    where I: SliceIndex<T>
+{
+    fn index_mut(&self, idx: I) -> &mut I::Output {
+        idx.index_mut(self)
+    }
+}
+```
+
+# Drawbacks
+
+- The `SliceIndex` trait is unfortunate - it's tuned for exactly the set of methods it's used by.
+  It only exists because inherent methods cannot be overloaded the same way that trait
+  implementations can be. It would most likely remain unstable indefinitely.
+- Documentation may suffer. Rustdoc output currently explicitly shows each of the ways you can
+  index a slice, while there will simply be a single generic implementation with this change. This
+  may not be that bad, though. The doc block currently seems to provided the most valuable
+  information to newcomers rather than the trait bound, and that will still be present with this
+  change.
+
+# Alternatives
+
+- Stay as is.
+- A previous version of this RFC introduced new `get_slice` etc methods rather than overloading
+  `get` etc. This avoids the utility trait but is somewhat less ergonomic.
+- Instead of one trait amalgamating all of the required methods, we could have one trait per
+  method. This would open a more reasonable door to stabilizing those traits, but adds quite a lot
+  more surface area. Replacing an unstable `SliceIndex` trait with a collection would be
+  backwards compatible.
+
+# Unresolved questions
+
+None