Hint Resolve regs_erasure_get regs_erasure_refl regs_erasure_set
: regs_erasure.
Notation the_ge := (@the_ge the_program).
(** ** Result about at_external, after_external and initial_core *)

Lemma regs_erasure_set_undef:
forall rs rs' r,
regs_erasure rs rs' ->
regs_erasure rs # r <- Vundef rs'.