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two (check-sat)s give different answers on QF_NIRA formula #3049

@muchang

Description

@muchang

Hi,
For this formula,

(declare-fun a () Int)
(declare-fun b () Real)
(declare-fun c () Real)
(assert (< a 0))
(assert (= (/ 2.0 b c) 1.0))
(check-sat)
(check-sat)

Two (check-sat)s give different answers:

[504] % z3 small.smt2
unknown
sat
[505] % 
[505] % cat small.smt2
(declare-fun a () Int)
(declare-fun b () Real)
(declare-fun c () Real)
(assert (< a 0))
(assert (= (/ 2.0 b c) 1.0))
(check-sat)
(check-sat)
[506] %

Changing a's type to Real or changing 2.0 to 1.0 makes it disappear.

OS: Ubuntu 18.04
Revision: 1ac365c

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