error: unsupported operation: unknown `miri_get_backtrace` flags 2
  --> $DIR/bad-backtrace-flags.rs:LL:CC
   |
LL |         miri_get_backtrace(2, 0 as *mut _);
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unknown `miri_get_backtrace` flags 2
   |
   = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support
           
   = note: inside `main` at $DIR/bad-backtrace-flags.rs:LL:CC

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

error: aborting due to previous error