error[E06002]: use of unassigned variable
  ┌─ tests/move_check/liveness/copy_after_move.move:5:9
  │
4 │         move x;
  │         ------
  │         │
  │         The value of 'x' was previously moved here.
  │         Suggestion: use 'copy x' to avoid the move.
5 │         copy x;
  │         ^^^^^^ Invalid usage of previously moved variable 'x'.