error: Undefined Behavior: pointer not dereferenceable: ALLOC has been freed, so this pointer is dangling
  --> tests/fail/rc_as_ptr.rs:LL:CC
   |
LL |     assert_eq!(42, **unsafe { &*Weak::as_ptr(&weak) });
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Undefined Behavior occurred here
   |
   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
help: ALLOC was allocated here:
  --> tests/fail/rc_as_ptr.rs:LL:CC
   |
LL |     let strong = Rc::new(Box::new(42));
   |                          ^^^^^^^^^^^^
help: ALLOC was deallocated here:
  --> tests/fail/rc_as_ptr.rs:LL:CC
   |
LL |     drop(strong);
   |     ^^^^^^^^^^^^
   = note: BACKTRACE (of the first span):
   = note: inside `main` at RUSTLIB/core/src/macros/mod.rs:LL:CC
   = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)

note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace

error: aborting due to 1 previous error