warning: thread support is experimental: the scheduler is not preemptive, and can get stuck in spin loops.
         (see https://github.com/rust-lang/miri/issues/1388)

error: Undefined Behavior: racy imperfectly overlapping atomic access is not possible in the C++20 memory model
  --> $DIR/racing_mixed_size_read.rs:LL:CC
   |
LL |             std::intrinsics::atomic_load_relaxed(hi);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ racy imperfectly overlapping atomic access is not possible in the C++20 memory model
   |
   = 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: inside closure at $DIR/racing_mixed_size_read.rs:LL:CC

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

error: aborting due to previous error; 1 warning emitted