Fix inappropriate use of slice::as_mut_ptr

Author: cuviper

src/vec.rs

@@ -226,8 +226,8 @@ impl<'data, T: 'data + Send> Producer for DrainProducer<'data, T> {
 impl<'data, T: 'data + Send> Drop for DrainProducer<'data, T> {
     fn drop(&mut self) {
         // extract the slice so we can use `Drop for [T]`
-        let slice_ptr = mem::take(&mut self.slice).as_mut_ptr();
-        unsafe { ptr::drop_in_place(slice_ptr) };
+        let slice_ptr: *mut [T] = mem::take::<&'data mut [T]>(&mut self.slice);
+        unsafe { ptr::drop_in_place::<[T]>(slice_ptr) };
     }
 }
 
@@ -277,9 +277,7 @@ impl<'data, T: 'data> iter::FusedIterator for SliceDrain<'data, T> {}
 impl<'data, T: 'data> Drop for SliceDrain<'data, T> {
     fn drop(&mut self) {
         // extract the iterator so we can use `Drop for [T]`
-        let slice_ptr = mem::replace(&mut self.iter, [].iter_mut())
-            .into_slice()
-            .as_mut_ptr();
-        unsafe { ptr::drop_in_place(slice_ptr) };
+        let slice_ptr: *mut [T] = mem::replace(&mut self.iter, [].iter_mut()).into_slice();
+        unsafe { ptr::drop_in_place::<[T]>(slice_ptr) };
     }
 }