error: Undefined Behavior: reading memory at ALLOC[0x0..0x4], but memory is uninitialized at [0x0..0x4], and this operation requires initialized memory
  --> tests/fail/validity/invalid_int_op.rs:LL:CC
   |
LL |     let i = unsafe { std::mem::MaybeUninit::<i32>::uninit().assume_init() };
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 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 tests/fail/validity/invalid_int_op.rs:LL:CC

Uninitialized memory occurred at ALLOC[0x0..0x4], in this allocation:
ALLOC (stack variable, size: 4, align: 4) {
    __ __ __ __                                     │ ░░░░
}

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

error: aborting due to 1 previous error