z3 reports invalid model

[muchang]

Hi,
For this formula,

(declare-fun a () Int)
(declare-fun b () Bool)
(declare-fun c () Bool)
(declare-fun d () Bool)
(declare-fun e () Bool)
(assert (= b (= (/ 1 0) a) (= b d e) (= e c d)))
(check-sat)
(get-model)

z3 will report a invaild model:

(model 
  (define-fun e () Bool
    true)
  (define-fun c () Bool
    false)
  (define-fun d () Bool
    true)
  (define-fun a () Int
    0)
  (define-fun b () Bool
    true)
)

OS: Ubuntu 18.04
Revision: 16d4ccd

[NikolajBjorner]

See #2663