remove unused `Sized` imports

src/libcollections/str.rs

@@ -59,7 +59,6 @@ use core::char::CharExt;
 use core::clone::Clone;
 use core::iter::AdditiveIterator;
 use core::iter::{range, Iterator, IteratorExt};
-use core::kinds::Sized;
 use core::ops;
 use core::option::Option::{self, Some, None};
 use core::slice::AsSlice;

src/libcore/raw.rs

@@ -20,7 +20,6 @@
 
 use kinds::Copy;
 use mem;
-use kinds::Sized;
 
 /// The representation of a Rust slice
 #[repr(C)]

src/libcore/slice.rs

@@ -1372,7 +1372,6 @@ pub unsafe fn from_raw_mut_buf<'a, T>(p: &'a *mut T, len: uint) -> &'a mut [T] {
 /// Operations on `[u8]`.
 #[experimental = "needs review"]
 pub mod bytes {
-    use kinds::Sized;
     use ptr;
     use slice::SliceExt;
 

src/libstd/ascii.rs

@@ -14,7 +14,6 @@
 
 #![unstable = "unsure about placement and naming"]
 
-use core::kinds::Sized;
 use iter::IteratorExt;
 use ops::FnMut;
 use slice::SliceExt;