Definition env_initial_value (e: env) (m: mem) :=
forall id b ty chunk,
e!id = Some(b, ty) -> access_mode ty = By_value chunk -> Mem.load chunk m b 0 = Some Vundef.

Lemma create_undef_temps_charact:
forall id ty vars, In (id, ty) vars -> (create_undef_temps vars)!id = Some Vundef.