Remove libdebug and update tests.
@@ -1177,7 +1177,7 @@ This is a list of behaviour not considered *unsafe* in Rust terms, but that may
be undesired.
* Deadlocks
-* Reading data from private fields (`std::repr`, `format!("{:?}", x)`)
+* Reading data from private fields (`std::repr`)
* Leaks due to reference count cycles, even in the global heap
* Exiting without calling destructors
* Sending signals
