Definition can_assume_funcptr cs Delta P Q R a fs :=
forall Espec c Post,
@semax cs Espec Delta ((EX v: val, (lift0 (func_ptr fs v) && local (`(eq v) (eval_expr a)))) &&
PROPx P (LOCALx Q (SEPx R))) c Post ->
@semax cs Espec Delta (PROPx P (LOCALx Q (SEPx R))) c Post.
Definition call_setup1
(cs: compspecs) Qtemp Qvar GV a Delta P Q R R'
fs argsig retty cc (A: rmaps.TypeTree)  Pre Post NEPre NEPost
(bl: list expr) (vl : list val)
(Qactuals : PTree.t _)
:=
local2ptree Q = (Qtemp, Qvar, nil, GV) /\
subsume_funspec fs (mk_funspec (argsig,retty) cc A Pre Post NEPre NEPost) /\
can_assume_funcptr  cs Delta P Q R' a fs /\
PROPx P (LOCALx Q (SEPx R')) |-- |> PROPx P (LOCALx Q (SEPx R)) /\
Cop.classify_fun (typeof a) = Cop.fun_case_f (type_of_params argsig) retty cc /\
ENTAIL Delta, PROPx P (LOCALx Q (SEPx R))
|-- (tc_expr Delta a)  /\
ENTAIL Delta, PROPx P (LOCALx Q (SEPx R))
|--  (tc_exprlist Delta (argtypes argsig) bl) /\
force_list (map (msubst_eval_expr Delta Qtemp Qvar GV)
(explicit_cast_exprlist (argtypes argsig) bl))
= Some vl /\
pTree_from_elements (List.combine (var_names argsig) vl) = Qactuals.

Lemma can_assume_funcptr1:
forall  cs Delta P Q R a fs v Qtemp Qvar GV,
local2ptree Q = (Qtemp, Qvar, nil, GV) ->
msubst_eval_expr Delta Qtemp Qvar GV a = Some v ->
ENTAIL Delta, PROPx P (LOCALx Q (SEPx R)) |-- lift0(func_ptr fs v) ->
can_assume_funcptr cs Delta P Q R a fs.