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Soundness bug in string formula #2721

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wintered opened this issue Nov 18, 2019 · 1 comment
Closed

Soundness bug in string formula #2721

wintered opened this issue Nov 18, 2019 · 1 comment

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@wintered
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Hi,

The following should be unsatisfiable but Z3 gives sat on it.

(declare-fun a () String)
(declare-fun b () Int)
(assert (> b 0))
(assert (= (int.to.str b) (str.++ "0" a)))
(check-sat)

Revision: 05ad90c
OS: Ubuntu 18.04
NikolajBjorner added a commit that referenced this issue Nov 18, 2019
@NikolajBjorner
block unsound itos solutions. #2721
9b72b60 
Signed-off-by: Nikolaj Bjorner <[email protected]>
NikolajBjorner added a commit that referenced this issue Nov 18, 2019
@NikolajBjorner
fix bug introduced when fixing #2721
dde8da8 
Signed-off-by: Nikolaj Bjorner <[email protected]>
@wintered
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Z3 now hangs on this formula. Is this expected?

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@NikolajBjorner @wintered