let define_comp comp =
let pool = F.pool () in
let name = F.Compinfo.basename comp in
let path = comp.cname in
let xm = F.p_fresh pool "m" (Model M.tau_of_mem) in
let xr = F.p_fresh pool "r" (Model (Record comp)) in
let xa,a = M.forall_loc pool in
define_update name pool name path
(xm::xr::xa) (F.var xm) a (C_comp comp) (F.var xr)