Assertion violation at /src/ast/ast.h

[merlinsun]

Hi,
For this instance, z3 dead0c9 debug build

# z3 small.smt2
sat
sat
ASSERTION VIOLATION
File: ../src/ast/ast.h
Line: 937
is_app(n)
(C)ontinue, (A)bort, (S)top, (T)hrow exception, Invoke (G)DB
 
# cat small.smt2
(set-option :rewriter.expand_nested_stores true)
(declare-const x27 Bool)
(declare-const x (Array (Array (Array Bool Bool) (Array Bool Bool)) (Array (Array Bool Bool) Bool)))
(declare-const x2 Bool)
(declare-fun a () (Array Bool Bool))
(declare-fun ar () (Array (Array Bool Bool) Bool))
(declare-fun r5 () (Array (Array Bool Bool) (Array Bool Bool)))
(check-sat)
(assert (exists ((V Int)) true))
(check-sat)
(assert (or x2 x27))
(assert (forall ((r (Array (Array Bool Bool) (Array Bool Bool)))) (and x2 (= (store x r (store ar a true)) (store (store x r5 ar) r ar)))))
(check-sat)