Local Open Scope pred.
(* Scall *)
Fixpoint alloc_juicy_variables (ge: genv) (rho: env) (jm: juicy_mem) (vl: list (ident*type)) : env * juicy_mem :=
match vl with
| nil => (rho,jm)
| (id,ty)::vars => match JuicyMemOps.juicy_mem_alloc jm 0 (@sizeof ge ty) with
(m1,b1) => alloc_juicy_variables ge (PTree.set id (b1,ty) rho) m1 vars
end
end.
Definition substopt {A} (ret: option ident) (v: val) (P: environ -> A)  : environ -> A :=
match ret with
| Some id => subst id v P
| None => P
end.

Lemma alloc_vars_lookup :
forall ge id m1 l ve m2 e ,
list_norepet (map fst l) ->
(forall i, In i (map fst l) -> e ! i = None) ->
Clight.alloc_variables ge (e) m1 l ve m2 ->
(exists v, e ! id = Some v) ->
ve ! id = e ! id.