src/HOL/SMT/Examples/cert/z3_linarith_11

fix soundness bug in Nitpick's "destroy_constrs" optimization

(benchmark Isabelle
:extrafuns (
  (uf_2 Real)
  (uf_1 Real)
 )
:assumption (< (+ (* 3.0 uf_1) (* 7.0 uf_2)) 4.0)
:assumption (< 3.0 (* 2.0 uf_1))
:assumption (not (< uf_2 0.0))
:formula true
)