Add unsafe_destructor_blind_to_params attribute in spots where it i…

…s needed for run-pass tests.

I still cannot do complete run-pass run in `--enable-debug` (*) build
due to rust-lang#27023.

But these bits are certainly necessary.

(*) (even after disabling debuginfo, see rust-lang#27139)

src/libcollections/btree/node.rs

@@ -272,12 +272,14 @@ impl<T> DoubleEndedIterator for RawItems<T> {
 }
 
 impl<T> Drop for RawItems<T> {
+    #[unsafe_destructor_blind_to_params]
     fn drop(&mut self) {
         for _ in self.by_ref() {}
     }
 }
 
 impl<K, V> Drop for Node<K, V> {
+    #[unsafe_destructor_blind_to_params]
     fn drop(&mut self) {
         if self.keys.is_null() ||
             (unsafe { self.keys.get() as *const K as usize == mem::POST_DROP_USIZE })
@@ -1394,6 +1396,7 @@ impl<K, V> TraversalImpl for MoveTraversalImpl<K, V> {
 }
 
 impl<K, V> Drop for MoveTraversalImpl<K, V> {
+    #[unsafe_destructor_blind_to_params]
     fn drop(&mut self) {
         // We need to cleanup the stored values manually, as the RawItems destructor would run
         // after our deallocation.

src/libcollections/vec_deque.rs

@@ -65,6 +65,7 @@ impl<T: Clone> Clone for VecDeque<T> {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T> Drop for VecDeque<T> {
+    #[unsafe_destructor_blind_to_params]
     fn drop(&mut self) {
         self.clear();
         unsafe {

src/test/run-pass/issue-24805-dropck-itemless.rs

@@ -13,6 +13,8 @@
 
 #![allow(non_camel_case_types)]
 
+#![feature(unsafe_destructor_blind_to_params)]
+
 trait UserDefined { }
 
 impl UserDefined for i32 { }
@@ -26,7 +28,10 @@ impl<'a, T> UserDefined for &'a T { }
 macro_rules! impl_drop {
     ($Bound:ident, $Id:ident) => {
         struct $Id<T:$Bound>(T);
-        impl <T:$Bound> Drop for $Id<T> { fn drop(&mut self) { } }
+        impl <T:$Bound> Drop for $Id<T> {
+            #[unsafe_destructor_blind_to_params]
+            fn drop(&mut self) { }
+        }
     }
 }