Remove unused import in core

src/libcore/at_vec.rs

@@ -13,7 +13,6 @@
 use cast::transmute;
 use kinds::Copy;
 use iter;
-use libc;
 use option::Option;
 use ptr::addr_of;
 use sys;

src/libcore/num/cmath.rs

@@ -10,10 +10,6 @@
 
 #[doc(hidden)]; // FIXME #3538
 
-use libc::c_int;
-use libc::c_float;
-use libc::c_double;
-
 // function names are almost identical to C's libmath, a few have been
 // renamed, grep for "rename:"
 

src/libcore/vec.rs

@@ -19,7 +19,6 @@
 use iter;
 use kinds::Copy;
 use libc;
-use libc::size_t;
 use option::{None, Option, Some};
 use unstable::intrinsics;
 use ptr;
@@ -76,9 +75,9 @@ pub fn reserve<T>(v: &mut ~[T], n: uint) {
             let td = sys::get_type_desc::<T>();
             if ((**ptr).box_header.ref_count ==
                 managed::raw::RC_MANAGED_UNIQUE) {
-                rustrt::vec_reserve_shared_actual(td, ptr, n as size_t);
+                rustrt::vec_reserve_shared_actual(td, ptr, n as libc::size_t);
             } else {
-                rustrt::vec_reserve_shared(td, ptr, n as size_t);
+                rustrt::vec_reserve_shared(td, ptr, n as libc::size_t);
             }
         }
     }
@@ -2071,7 +2070,6 @@ pub mod raw {
     use kinds::Copy;
     use managed;
     use option::{None, Some};
-    use option;
     use unstable::intrinsics;
     use ptr::addr_of;
     use ptr;