error: Undefined Behavior: Data race detected between Write on thread `<unnamed>` and Write on thread `<unnamed>` at ALLOC
  --> $DIR/write_write_race_stack.rs:LL:CC
   |
LL |             stack_var = 1usize;
   |             ^^^^^^^^^^^^^^^^^^ Data race detected between Write on thread `<unnamed>` and Write on thread `<unnamed>` at ALLOC
   |
   = 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 closure at $DIR/write_write_race_stack.rs:LL:CC

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

error: aborting due to previous error