Hint Resolve  @eval_expr_Etempvar'.
Hint Rewrite Int.add_zero  Int.add_zero_l Int.sub_zero_l : norm.
Hint Rewrite Ptrofs.add_zero  Ptrofs.add_zero_l Ptrofs.sub_zero_l : norm.

Lemma eval_var_env_set:
forall i t j v (rho: environ), eval_var i t (env_set rho j v) = eval_var i t rho.