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_undef:
forall regs rs rs',
regs_erasure rs rs' ->
regs_erasure (undef_regs regs rs) (undef_regs regs rs').