{ simp
  apply RTC.refl }
case hbc.hbc.hbc.hbc.hbc.hbc.hbc

⊢ RTC SmallStep (Stmt.skip, State.update "x" (State.update "x" 1 (fun x => 0) "x" - 1) (State.update "x" 1 fun x => 0))
    (Stmt.skip, fun x => 0)
no goals