rollup merge of #20061: aturon/stab-2-vec-slice

Conflicts:
	src/libcollections/slice.rs
	src/libcollections/vec.rs
	src/libstd/sys/windows/os.rs

src/test/bench/core-std.rs

@@ -65,7 +65,7 @@ fn shift_push() {
     let mut v2 = Vec::new();
 
     while v1.len() > 0 {
-        v2.push(v1.remove(0).unwrap());
+        v2.push(v1.remove(0));
     }
 }
 

src/test/bench/shootout-reverse-complement.rs

@@ -181,7 +181,7 @@ fn reverse_complement(seq: &mut [u8], tables: &Tables) {
         unsafe {
             copy_memory(seq.as_mut_ptr().offset((i - off + 1) as int),
                         seq.as_ptr().offset((i - off) as int), off);
-            *seq.unsafe_mut(i - off) = b'\n';
+            *seq.get_unchecked_mut(i - off) = b'\n';
         }
         i += LINE_LEN + 1;
     }

src/test/compile-fail/issue-15756.rs

@@ -9,9 +9,9 @@
 // except according to those terms.
 
 use std::slice::Chunks;
-use std::slice::MutChunks;
+use std::slice::ChunksMut;
 
-fn dft_iter<'a, T>(arg1: Chunks<'a,T>, arg2: MutChunks<'a,T>)
+fn dft_iter<'a, T>(arg1: Chunks<'a,T>, arg2: ChunksMut<'a,T>)
 {
     for
     &something

src/test/compile-fail/resolve-conflict-type-vs-import.rs

@@ -15,4 +15,3 @@ struct Iter;
 
 fn main() {
 }
-