error: Undefined Behavior: constructing invalid value: encountered a dangling reference (0x18[noalloc] has no provenance)
  --> tests/fail/dangling_pointers/deref_dangling_ref.rs:LL:CC
   |
LL |     let _val = unsafe { addr_of_mut!(**outer) };
   |                         ^^^^^^^^^^^^^^^^^^^^^ 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
   = note: BACKTRACE:
   = note: inside `main` at RUSTLIB/core/src/ptr/mod.rs:LL:CC
   = note: this error originates in the macro `addr_of_mut` (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