Section CENV_SUB.
intros.
rewrite <- (@eval_expr_cenv_sub_eq _ _ CSUB rho e); auto; congruence.
Qed.
intros.
rewrite <- (@eval_expr_cenv_sub_eq _ _ CSUB rho e); auto; congruence.
Qed.
intros.
rewrite <- (@eval_expr_cenv_sub_eq _ _ CSUB rho e); auto; congruence.
Qed.
intros.
rewrite <- (@eval_expr_cenv_sub_eq _ _ CSUB rho e); auto; congruence.
Qed.

Lemma islong_eval_expr_cenv_sub {CS CS'} (CSUB : cenv_sub (@cenv_cs CS) (@cenv_cs CS')) rho e
(E: is_long (@eval_expr CS e rho)):
is_long (@eval_expr CS' e rho).