Auto merge of #1663 - RalfJung:rustup, r=RalfJung

test Weak into_raw/from_raw on dangling ptrs

Author: bors

rust-version

@@ -1 +1 @@
-507bff92fadf1f25a830da5065a5a87113345163
+8b002d5c3489a21db2c16e5af63cf5d234f6972c

tests/run-pass/intrinsics.rs

@@ -1,7 +1,8 @@
 #![feature(core_intrinsics, const_raw_ptr_comparison)]
+#![feature(layout_for_ptr)]
 
 use std::intrinsics;
-use std::mem::{size_of, size_of_val};
+use std::mem::{size_of, size_of_val, size_of_val_raw};
 
 struct Bomb;
 
@@ -19,6 +20,9 @@ fn main() {
     assert_eq!(size_of_val(&[1, 2, 3] as &[i32]), 12);
     assert_eq!(size_of_val("foobar"), 6);
 
+    unsafe { assert_eq!(size_of_val_raw(&[1] as &[i32] as *const [i32]), 4); }
+    unsafe { assert_eq!(size_of_val_raw(0x100 as *const i32), 4); }
+
     assert_eq!(intrinsics::type_name::<Option<i32>>(), "core::option::Option<i32>");
 
     assert_eq!(intrinsics::likely(false), false);

tests/run-pass/rc.rs

@@ -4,7 +4,7 @@
 
 use std::cell::{Cell, RefCell};
 use std::rc::{Rc, Weak};
-use std::sync::Arc;
+use std::sync::{Arc, Weak as ArcWeak};
 use std::fmt::Debug;
 
 fn rc_refcell() {
@@ -48,6 +48,9 @@ fn arc() {
         a
     }
     assert_eq!(*test(), 42);
+
+    let raw = ArcWeak::into_raw(ArcWeak::<usize>::new());
+    drop(unsafe { ArcWeak::from_raw(raw) });
 }
 
 // Make sure this Rc doesn't fall apart when touched
@@ -84,6 +87,9 @@ fn weak_into_raw() {
 
     drop(unsafe { Weak::from_raw(raw) });
     assert_eq!(0, Rc::weak_count(&strong));
+
+    let raw = Weak::into_raw(Weak::<usize>::new());
+    drop(unsafe { Weak::from_raw(raw) });
 }
 
 /// Taken from the `Weak::from_raw` doctest.