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Incorrect answer on String formula #2717

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muchang opened this issue Nov 18, 2019 · 0 comments
Closed

Incorrect answer on String formula #2717

muchang opened this issue Nov 18, 2019 · 0 comments

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@muchang
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muchang commented Nov 18, 2019

Hi,
For this formula,

(declare-fun a () String)
(assert (str.in.re a (re.loop (str.to.re "b") 1 0)))
(assert (> (str.len a) 0))
(check-sat)

z3 trunk reports unsat, while z3-4.8.6 and CVC4 reports sat.

OS: Ubuntu 18.04
Revision: d95b549
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@muchang